Adocia indistincta (Bowerbank, 1866) accepted as Haliclona (Rhizoniera) indistincta (Bowerbank, 1866) (new combination reference)
Adocia mcandrewii (Bowerbank, 1866) accepted as Haliclona (Halichoclona) fistulosa (Bowerbank, 1866) (new combination reference)
Adocia urceolus (Rathke & Vahl, 1806) accepted as Haliclona (Haliclona) urceolus (Rathke & Vahl, 1806) (new combination reference)
Amphilectus dubius (Bowerbank, 1874) accepted as Amphilectus fucorum (Esper, 1794) (additional source)
Amphilectus edwardii (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Amphilectus gracilis (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (additional source)
Amphilectus imitatus (Bowerbank, 1874) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Aplysina zetlandica (Bowerbank, 1866) accepted as Spongionella pulchella (Sowerby, 1804) (new combination reference)
Axinella barleei (Bowerbank, 1866) accepted as Clathria (Clathria) barleei (Bowerbank, 1866) (new combination reference)
Axinella distorta (Bowerbank, 1866) accepted as Axinella dissimilis (Bowerbank, 1866) (new combination reference)
Caminus osculosus Grübe, 1872 accepted as Pachymatisma johnstonia (Bowerbank in Johnston, 1842) (basis of record)
Clathria laciniosa (Bowerbank in Norman, 1869) accepted as Clathria (Clathria) barleei (Bowerbank, 1866) (new combination reference)
Crella inflata (Bowerbank, 1874) accepted as Halicnemia patera Bowerbank, 1864 (new combination reference)
Dendoryx thompsoni (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Dysidea coriacea Bowerbank, 1874 accepted as Dysidea fragilis (Montagu, 1814) (source of synonymy)
Ectyodoryx foliata (Fristedt, 1887) accepted as Lissodendoryx (Ectyodoryx) foliata (Fristedt, 1887) (additional source)
Esperella normani (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Esperia collina (Bowerbank, 1882) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Esperiopsis dubia (Bowerbank, 1874) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Esperiopsis gracilis (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Esperiopsis paupera (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Esperiopsis thompsoni (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Gellius pumiceus (Fristedt, 1885) accepted as Hemigellius pumiceus (Fristedt, 1885) (new combination reference)
Halichondria cylindracea Bowerbank, 1882 represented as Desmacidon fruticosum (Montagu, 1814) (basis of record)
Halichondria parasitica (Montagu, 1814) represented as Amphilectus fucorum (Esper, 1794) (additional source)
Haliclona excelsa (Schmidt, 1870) accepted as Isodictya palmata (Ellis & Solander, 1786) (new combination reference)
Isodictya flabelliformis (Hansen, 1885) accepted as Dendoricella flabelliformis (Hansen, 1885) (new combination reference)
Mycale rotalis (Bowerbank, 1874) represented as Mycale (Aegogropila) rotalis (Bowerbank, 1874) (additional source)
Myxilla thompsoni (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Phakellia infundibuliformis (Linnaeus, 1759) accepted as Axinella infundibuliformis (Linnaeus, 1759) (source of synonymy)
Placochalina infundibuliformis (Linnaeus, 1759) accepted as Axinella infundibuliformis (Linnaeus, 1759) (source of synonymy)
Polymastia mammeata (Bowerbank, 1866) accepted as Hymeniacidon perlevis (Montagu, 1814) (new combination reference)
Prosuberites epiphytum sensu Topsent, 1900 accepted as Protosuberites denhartogi van Soest & de Kluijver, 2003 (additional source)
Reniera paupera (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Reniera uniformis (Bowerbank, 1866) accepted as Hymeniacidon perlevis (Montagu, 1814) (new combination reference)

 Synonymy

 for Halichondria robertsoni Bowerbank, 1882

Reassigned to Hastatus robertsoni by Fristedt (1885), p. 34, which was assigned to the synonymy of Myxilla ... [details]

 Synonymy

 for Halichondria virgea Bowerbank, 1882

Synonymy was suggested by Arndt (1935), p. 58. [details]

 Synonymy

 for Hymedesmia pulchella Bowerbank, 1882

Synonymy was suggested by Arndt (1935), p.67. Previously, Lundbeck (1910), p. 116, stated that it 'seems to be ... ... [details]

 Synonymy

 for Isodictya deformis Bowerbank, 1882

Synonymy suggested by Arndt (1935), p. 59. [details]

 Synonymy

 for Isodictya inaequalis Bowerbank, 1882

Synonymy suggested by Arndt (1935), p. 59. [details]