Acirsa (Acirsa) funiculosa Cossmann, 1888 † accepted as Acirsa funiculosa Cossmann, 1888 † (original description)
Acrophlyctis Cossmann, 1888 † accepted as Bythinella (Acrophlyctis) Cossmann, 1888 † represented as Bythinella Moquin-Tandon, 1856 (original description)
Adeorbis labiosus Cossmann, 1888 † accepted as Cyclostremiscus labiosus (Cossmann, 1888) † (original description)
Adeorbis quinquecincta Cossmann, 1888 † accepted as Cyclostremiscus quinquecinctus (Cossmann, 1888) † (original description)
Amberleya bezanconi Cossmann, 1888 † accepted as Eucyclus bezanconi (Cossmann, 1888) † (original description)
Ampullina (Crommium) Cossmann, 1888 † accepted as Crommium Cossmann, 1888 † (original description)
Ampullina ligata Cossmann, 1888 † accepted as Amaurellina ligata (Cossmann, 1888) † (original description)
Assiminea contracta Cossmann, 1888 † accepted as Peringia contracta (Cossmann, 1888) † (original description)
Assiminea eburnoides Cossmann, 1888 † accepted as Emmericia eburnoides (Cossmann, 1888) † (original description)
Assiminea stenochora Cossmann, 1888 † accepted as Lapparentia stenochora (Cossmann, 1888) † (original description)
Atractotrema Cossmann, 1888 † (original description)
Balanocochlis eulimoides Cossmann, 1888 † accepted as Stenothyrella eulimoides (Cossmann, 1888) † (original description)
Basilissa boutillieri Cossmann, 1888 † accepted as Jujubinus boutillieri (Cossmann, 1888) † (original description)
Bayania bourdoti Cossmann, 1888 † (original description)
Bayania essomiensis Cossmann, 1888 † accepted as Bittium essomiense (Cossmann, 1888) † (original description)
Bayania hordacea (Lamarck, 1804) † (basis of record)
Bayania laubrierei Cossmann, 1888 † (original description)
Berellaia de Laubrière & Carez, 1881 † (additional source)
Bithinella (Dieretostoma) Cossmann, 1888 † accepted as Dieretostoma Cossmann, 1888 † (original description)
Bithinella (Lartetia) plicistria Cossmann, 1888 † accepted as Paladilhia plicistria (Cossmann, 1888) † (original description)
Bithinella cirsophora Cossmann, 1888 † accepted as Bythinella cirsophora Cossmann, 1888 † (original description)
Bithinella mutata Cossmann, 1888 † accepted as Bythinella minuata (Deshayes, 1862) † (original description)
Bithinella sphaeroidalis Cossmann, 1888 † accepted as Bythinella sphaeroidalis Cossmann, 1888 † (original description)
Bithinia oxyspira Cossmann, 1888 † accepted as Pseudamnicola oxyspira (Cossmann, 1888) † (original description)
Bithinia striatula (Deshayes, 1824) † accepted as Bayania hordacea (Lamarck, 1804) † (source of synonymy)
Bouryia Cossmann, 1888 † (original description)
Bouryia convexiuscula Cossmann, 1888 † accepted as Bouryia microstoma microstoma (Deshayes, 1824) † (original description)
Bouryia polygyrata Cossmann, 1888 † (original description)
Boutillieria Cossmann, 1888 † accepted as Homalopoma (Boutillieria) Cossmann, 1888 † represented as Homalopoma P. P. Carpenter, 1864 (original description)
Bythinella minuata (Deshayes, 1862) † (additional source)
Calliomphalus Cossmann, 1888 † (original description)
Canaliscala Cossmann, 1888 † (original description)
Cavilabium Cossmann, 1888 † (original description)
Ceratia minutissima Cossmann, 1888 † (original description)
Chevallieria Cossmann, 1888 (original description)
Chevallieria labrosa Cossmann, 1888 † (original description)
Chevallieria mumiola Cossmann, 1888 † (original description)
Collonia (Cirsochilus) Cossmann, 1888 † accepted as Cirsochilus Cossmann, 1888 † (original description)
Collonia (Cyniscella) Cossmann, 1888 † accepted as Cyniscella Cossmann, 1888 † (original description)
Collonia flammulata Cossmann, 1888 † (original description)
Collonia goniomphalus Cossmann, 1888 † accepted as Circulopsis goniomphalus (Cossmann, 1888) † (original description)
Collonia obsoleta Cossmann, 1888 † accepted as Cirsochilus obsoletus (Cossmann, 1888) † (original description)
Cyclostoma (Dissostoma) Cossmann, 1888 † accepted as Dissostoma Cossmann, 1888 † (original description)
Cyclostoma mumia Lamarck, 1804 † accepted as Dissostoma mumia (Lamarck, 1804) † (new combination reference)
Cyclostrema obsoleta Cossmann, 1888 † accepted as Skeneopsis obsoleta (Cossmann, 1888) † (original description)
Cylichna (Acrotrema) Cossmann, 1889 † accepted as Cylichna Lovén, 1846 (original description)
Cymenorytis Cossmann, 1888 † (original description)
Cymenorytis conica Cossmann, 1888 † (original description)
Cymenorytis densesulcata Cossmann, 1888 † (original description)
Delphinula regleyi Cossmann, 1888 † accepted as Delphinula regleyana Deshayes, 1832 † accepted as Angaria regleyana (Deshayes, 1832) † (original description)
Dentalium (Laevidentalium) Cossmann, 1888 accepted as Laevidentalium Cossmann, 1888 (original description)
Dentalium (Lobantale) Cossmann, 1888 † accepted as Lobantale Cossmann, 1888 † (original description)
Dialopsis Cossmann, 1888 † (original description)
Dialytostoma Cossmann, 1888 † accepted as Macromphalus S. V. Wood, 1842 (original description)
Diastictus Cossmann, 1888 † accepted as Cossmannia R. B. Newton, 1891 † (original description)
Diastictus decipiens (Deshayes, 1861) † accepted as Cossmannia decipiens (Deshayes, 1861) † (new combination reference)
Diastictus expansus (Deshayes, 1861) † accepted as Cossmannia expansa (Deshayes, 1861) † (new combination reference)
Discobasis Cossmann, 1888 † (original description)
Discobasis demissa (Deshayes, 1861) † (new combination reference)
Discohelix plicatella Cossmann, 1888 † accepted as Orbitestella plicatella (Cossmann, 1888) † (original description)
Dissochilus Cossmann, 1888 † (original description)
Eligmostoma Cossmann, 1888 † (original description)
Eligmostoma nitidulum (Deshayes, 1862) † accepted as Eligmostoma bucquoyi Le Renard, 1994 † (new combination reference)
Emarginula mariae Cossmann, 1888 † (original description)
Enoplochiton rochebrunei Cossmann, 1888 † (original description)
Escharella Cossmann, 1888 † accepted as Macromphalus S. V. Wood, 1842 (original description)
Escharella (Macromphalina) Cossmann, 1888 † accepted as Macromphalina Cossmann, 1888 (original description)
Escharella (Macromphalina) decussata Cossmann, 1888 † accepted as Macromphalina decussata (Cossmann, 1888) † (original description)
Escharella (Micromphalina) Cossmann, 1888 † accepted as Macromphalus S. V. Wood, 1842 (original description)
Escharella (Micromphalina) elegans (Deshayes, 1861) † accepted as Macromphalus elegans (Deshayes, 1861) † (basis of record)
Escharella citharella Cossmann, 1888 accepted as Macromphalus citharella (Cossmann, 1888) † (original description)
Escharella subsoluta Cossmann, 1888 † accepted as Macromphalus subsolutus (Cossmann, 1888) † (original description)
Eulima (Margineulima) Cossmann, 1888 † accepted as Margineulima Cossmann, 1888 † (original description)
Eulima deshayesi Cossmann, 1888 accepted as Polygireulima deshayesi (Cossmann, 1888) † (original description)
Eulima rectilabrum Cossmann, 1888 † accepted as Rectilabrum rectilabrum (Cossmann, 1888) † (original description)
Eulima spinula Cossmann, 1888 † accepted as Ophioarachnicola spinula (Cossmann, 1888) † (original description)
Eulima subimbricata Cossmann, 1888 † accepted as Polygireulima subimbricata (Cossmann, 1888) † (original description)
Eumargarita (Periaulax) Cossmann, 1888 † accepted as Solariella S. V. Wood, 1842 (original description)
Faunus (Melanatria) dufresnei [sic] † accepted as Jponsia dufresnii (Deshayes, 1825) † (basis of record)
Faunus (Melanatria) dufresnei var. laubrierei Cossmann, 1888 † accepted as Jponsia cuvieri (Deshayes, 1825) † (original description)
Faunus (Pirenopsis) rissoinaeformis Cossmann, 1888 † accepted as Hemisinus rissoinaeformis (Cossmann, 1888) † (original description)
Fissurella asperrima Cossmann, 1888 † accepted as Diodora asperrima (Cossmann, 1888) † (original description)
Fissurella boutillieri Cossmann, 1888 † accepted as Diodora boutillieri (Cossmann, 1888) † (original description)
Foratiscala mesaliopsis Cossmann, 1888 † accepted as Bezanconia spirata (Lamarck, 1804) † (original description)
Gibbula (Phorculus) Cossmann, 1888 † accepted as Phorculus Cossmann, 1888 † (original description)
Helcion boutillieri Cossmann, 1888 † accepted as Lepeta boutillieri (Cossmann, 1888) † (original description)
Hipponix laubrierei Cossmann, 1888 † (original description)
Hipponyx laubrierei Cossmann, 1888 † accepted as Hipponix laubrierei Cossmann, 1888 † (original description)
Hydrobia (Polycirsus) Cossmann, 1888 † accepted as Polycirsus Cossmann, 1888 † (original description)
Hydrobia (Polycirsus) bouryi Cossmann, 1888 † accepted as Stalioa bouryi (Cossmann, 1888) † (original description)
Hydrobia (Polycirsus) tuba var. ducyensis Cossmann, 1888 † accepted as Polycirsus tuba ducyensis (Cossmann, 1888) † (original description)
Hydrobia (Polycirsus) tuba var. morleti Cossmann, 1888 † accepted as Polycirsus tuba morleti (Cossmann, 1888) † (original description)
Hydrobia laubrierei Cossmann, 1888 † (original description)
Hydrobia nitens distorta Cossmann, 1888 † accepted as Parhydrobia nitens distorta (Cossmann, 1888) † (original description)
Lacuna (Cirsope) Cossmann, 1888 † accepted as Cirsope Cossmann, 1888 † (original description)
Lacuna (Entomope) Cossmann, 1888 † accepted as Entomope Cossmann, 1888 † (original description)
Lacuna (Medoriopsis) Cossmann, 1888 † accepted as Medoriopsis Cossmann, 1888 † (original description)
Lacuna actaeonoides Cossmann, 1888 † accepted as Medoriopsis actaeonoides (Cossmann, 1888) † (original description)
Lacuna amaura Cossmann, 1888 † (original description)
Lacuna aratulus Cossmann, 1888 † accepted as Orthochilus aratulus (Cossmann, 1888) † (original description)

France for Acirsa (Acirsa) funiculosa Cossmann, 1888 † 
France for Acirsa funiculosa Cossmann, 1888 † 
France for Adeorbis labiosus Cossmann, 1888 † 
France for Adeorbis quinquecincta Cossmann, 1888 † 
France for Amberleya bezanconi Cossmann, 1888 † 
France for Ampullina ligata Cossmann, 1888 † 
France for Assiminea contracta Cossmann, 1888 † 
France for Assiminea contracta Cossmann, 1888 † 
France for Assiminea contracta Cossmann, 1888 † 
France for Assiminea eburnoides Cossmann, 1888 † 
France for Assiminea eburnoides Cossmann, 1888 † 
France for Assiminea stenochora Cossmann, 1888 † 
France for Balanocochlis eulimoides Cossmann, 1888 † 
France for Balanocochlis eulimoides Cossmann, 1888 † 
France for Basilissa boutillieri Cossmann, 1888 † 
France for Bayania bourdoti Cossmann, 1888 † 
France for Bayania essomiensis Cossmann, 1888 † 
France for Bithinella (Lartetia) plicistria Cossmann, 1888 † 
France for Bithinella (Lartetia) plicistria Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella cirsophora Cossmann, 1888 † 
France for Bithinella sphaeroidalis Cossmann, 1888 † 
France for Bithinia oxyspira Cossmann, 1888 † 
France for Bouryia convexiuscula Cossmann, 1888 † 
France for Bouryia polygyrata Cossmann, 1888 † 
France for Ceratia minutissima Cossmann, 1888 † 
France for Chevallieria microtumida Lozouet, 1999 † 
France for Chevallieria mumiola Cossmann, 1888 † 
France for Collonia flammulata Cossmann, 1888 † 
France for Collonia goniomphalus Cossmann, 1888 † 
France for Collonia obsoleta Cossmann, 1888 † 
France for Cyclostrema obsoleta Cossmann, 1888 † 
France for Cymenorytis conica Cossmann, 1888 † 
France for Cymenorytis densesulcata Cossmann, 1888 † 
France for Eligmostoma nitidulum (Deshayes, 1862) † 
France for Emarginula mariae Cossmann, 1888 † 
France for Enoplochiton rochebrunei Cossmann, 1888 † 
France for Escharella subsoluta Cossmann, 1888 † 
France for Eulima rectilabrum Cossmann, 1888 † 
France for Eulima spinula Cossmann, 1888 † 
France for Eulima subimbricata Cossmann, 1888 † 
France for Faunus (Melanatria) dufresnei var. laubrierei Cossmann, 1888 † 
France for Faunus (Pirenopsis) rissoinaeformis Cossmann, 1888 † 
France for Fissurella asperrima Cossmann, 1888 † 
France for Fissurella boutillieri Cossmann, 1888 † 
France for Foratiscala mesaliopsis Cossmann, 1888 † 
France for Helcion boutillieri Cossmann, 1888 † 
France for Hipponyx laubrierei Cossmann, 1888 † 
France for Hydrobia (Polycirsus) bouryi Cossmann, 1888 † 
France for Hydrobia (Polycirsus) tuba var. ducyensis Cossmann, 1888 † 
France for Hydrobia (Polycirsus) tuba var. morleti Cossmann, 1888 † 
France for Hydrobia laubrierei Cossmann, 1888 † 
France for Hydrobia nitens distorta Cossmann, 1888 † 
France for Lacuna actaeonoides Cossmann, 1888 † 
France for Lacuna amaura Cossmann, 1888 † 
France for Lacuna aratulus Cossmann, 1888 † 
France for Lacuna circumvallata Cossmann, 1888 † 
France for Lacuna cochlearella Cossmann, 1888 † 
France for Lacuna compressa Cossmann, 1888 † 
France for Lacuna craspedomphalus Cossmann, 1888 † 
France for Lacuna cuisensis Cossmann, 1888 † 
France for Lacuna wateleti Cossmann, 1888 † 
France for Lacunodon bernayi Cossmann, 1888 † 
France for Lacunoptyxis praelonga (Deshayes, 1861) † 
France for Littorina bernayi Cossmann, 1888 † 
France for Littorina deshayesi Cossmann, 1888 † 
France for Littoriniscala asperrima Cossmann, 1888 † 
France for Mathildia bouryi Cossmann, 1888 † 
France for Mathildia tenuisculptus Cossmann, 1888 † 
France for Megalomastoma eurybasis Cossmann, 1888 † 
France for Melanopsis lactacea Cossmann, 1888 † 
France for Melanopsis lactacea Cossmann, 1888 † 
France for Melanopsis lactacea Cossmann, 1888 † 
France for Melanopsis mausseneti Cossmann, 1888 † 
France for Mesalia chaussyensis Cossmann, 1888 † 
France for Mesalia dameriacensis Cossmann, 1888 † 
France for Mitrularia boutillieri Cossmann, 1888 † 
France for Monodonta compsa Cossmann, 1888 † 
France for Narica altus Cossmann, 1888 † 
France for Natica boutillieri Cossmann, 1888 † 
France for Natica pseudoclimax Cossmann, 1888 † 
France for Natica viviparoides Cossmann, 1888 † 
France for Nerita baudoni Cossmann, 1888 † 
France for Neritina bouryi Cossmann, 1888 † 
France for Neritina bouryi Cossmann, 1888 † 
France for Neritina laubrierei Cossmann, 1888 † 
France for Niso morleti Cossmann, 1888 † 
France for Norrisia pterochilus Cossmann, 1888 † 
France for Odontostomia limnaeiformis Cossmann, 1888 † 
France for Odontostomia macroptyxis Cossmann, 1888 † 
France for Odontostomia nisoides Cossmann, 1888 † 
France for Patella lophophora Cossmann, 1888 † 
France for Phasianella herouvalensis Cossmann, 1888 † 
France for Phasianella laubrierei Cossmann, 1888 † 
France for Phasianella succinaeopsis Cossmann, 1888 † 
France for Platychilus labiosus Cossmann, 1888 † 

 Synonymy

 for Bithinella mutata Cossmann, 1888 †

Cossmann (1888) wrongly considered Bithinia minuata Deshayes, 1862 as a junior homonym of "Bithinia minuta Req." ... [details]

 Type locality

 for Assiminea contracta Cossmann, 1888 †

Étampes (Côte Saint-Martin) ("Mont-Saint-Martin"), Essonne, and Haravilliers (Le Ruel), Val-d'Oise, and Le Fayel, ... [details]

 Type locality

 for Assiminea eburnoides Cossmann, 1888 †

Beynes (Ferme de l'Orme), Yvelines, and Vaudancourt, Oise, France; Lutetian, middle Eocene [details]

 Type locality

 for Assiminea stenochora Cossmann, 1888 †

Épernay (Mont Bernon), Marne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Balanocochlis eulimoides Cossmann, 1888 †

Haravilliers (Le Ruel), Val-d'Oise, and Montagny-en-Vexin, Oise, France; Bartonian, late Eocene [details]

 Type locality

 for Bithinella (Lartetia) plicistria Cossmann, 1888 †

Brasles and Sinceny, Aisne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Bithinella cirsophora Cossmann, 1888 †

Chaussy and Saint-Witz (Guépelle), Val-d'Oise, and Chéry-Chartreuve, Aisne, and Houdan and Septeuil, Yvelines, ... [details]

 Type locality

 for Bithinella sphaeroidalis Cossmann, 1888 †

Chavot-Courcourt, Marne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Bithinia oxyspira Cossmann, 1888 †

Chaumont-en-Vexin (Gomerfontaine), Oise, France; Lutetian, middle Eocene [details]

 Type locality

 for Bouryia convexiuscula Cossmann, 1888 †

Valmondois, Val-d'Oise, France; early Bartonian, late Eocene [details]

 Type locality

 for Bouryia polygyrata Cossmann, 1888 †

Neauphlette, Yvelines, France; Lutetian, middle Eocene [details]

 Type locality

 for Faunus (Melanatria) dufresnei var. laubrierei Cossmann, 1888 †

Brasles, Aisne, France; Sables de Brasles, late Ypresian, early Eocene [details]

 Type locality

 for Faunus (Pirenopsis) rissoinaeformis Cossmann, 1888 †

Sinceny, Aisne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Hydrobia (Polycirsus) bouryi Cossmann, 1888 †

Villers-Allerand (Mont Chenot) ("Montchenot, près Reims"), Marne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Hydrobia (Polycirsus) tuba var. ducyensis Cossmann, 1888 †

Fresnoy-le-Luat (Ducy), Oise, France; Calcaire de Ducy, Bartonian, late Eocene [details]

 Type locality

 for Hydrobia (Polycirsus) tuba var. morleti Cossmann, 1888 †

Haravilliers (Le Ruel), Val-d'Oise, France; late Bartonian, late Eocene [details]

 Type locality

 for Hydrobia laubrierei Cossmann, 1888 †

Chenay, Marne, France; Sables de Bracheux, late Thanetian, late Paleocene [details]

 Type locality

 for Hydrobia nitens distorta Cossmann, 1888 †

Septeuil, Yvelines, France; Lutetian, middle Eocene [details]

 Type locality

 for Megalomastoma eurybasis Cossmann, 1888 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Melanopsis lactacea Cossmann, 1888 †

Châlons-sur-Vesles, Chenay and Jonchery-sur-Vesles, Marne, France; Sables de Bracheux, late Thanetian, late Paleocene [details]

 Type locality

 for Melanopsis mausseneti Cossmann, 1888 †

Épernay (Mont Bernon), Marne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Neritina bouryi Cossmann, 1888 †

Courcelles-Sapicourt (Sapicourt), Marne, and Cuise-la-Motte ("Cuise"), Oise, France; Cuisian, late Ypresian, early ... [details]

 Type locality

 for Neritina laubrierei Cossmann, 1888 †

Chenay, Marne, France; Sables de Bracheux, late Thanetian, late Paleocene [details]

 Type locality

 for Pomatias proximum Cossmann, 1888 †

Grauves, Marne, France; Cuisian, late Ypresian, early Eocene [details]

 Type locality

 for Stenothyra chorista Cossmann, 1888 †

Dizy, Épernay (Mont Bernon) and Rilly-la-Montagne, Marne, France; Sparnacian, early Ypresian, early Eocene [details]

 Type locality

 for Stenothyra cuneata Cossmann, 1888 †

Haravilliers (Le Ruel) and Marines, Val-d'Oise, and Le Fayel and Montagny-en-Vexin, Oise, France; Bartonian, late Eocene [details]

 Type locality

 for Truncatella distensa Cossmann, 1888 †

Chenay, Marne, France; Sables de Bracheux, late Thanetian, late Paleocene [details]

 Type locality

 for Valvata (Cincinna) bouryi Cossmann, 1888 †

Neauphlette, Yvelines, France; Lutetian, middle Eocene [details]