1. Species Eolis adelaidae W. Thompson, 1860 accepted as Amphorina farrani (Alder & Hancock, 1844)
2. Species Eolis alba Alder & Hancock, 1844 accepted as Favorinus branchialis (Rathke, 1806) (synonym)
3. Species Eolis albicans Friele & Hansen, 1876 accepted as Calma glaucoides (Alder & Hancock, 1854) (synonym)
4. Species Eolis alderi Cocks, 1852 accepted as Aeolidiella alderi (Cocks, 1852) (original combination)
5. Species Eolis alderiana Deshayes, 1865 accepted as Spurilla neapolitana (Delle Chiaje, 1841)
6. Species Eolis amethystina Alder & Hancock, 1845 accepted as Eubranchus tricolor Forbes, 1838 (synonym)
7. Species Eolis amoena Alder & Hancock, 1845 accepted as Rubramoena amoena (Alder & Hancock, 1845)
8. Species Eolis andreapolis McIntosh, 1865 accepted as Eubranchus farrani (Alder & Hancock, 1844) accepted as Amphorina farrani (Alder & Hancock, 1844) (synonym)
9. Species Eolis angulata Alder & Hancock, 1844 accepted as Aeolidiella glauca (Alder & Hancock, 1845) (dubious synonym)
10. Species Eolis armoricana Hesse, 1872 accepted as Tenellia adspersa (von Nordmann, 1845) (synonym)
11. Species Eolis aurantia Alder & Hancock, 1842 accepted as Catriona aurantia (Alder & Hancock, 1842)
12. Species Eolis aurantiaca Alder & Hancock, 1851 accepted as Catriona aurantia (Alder & Hancock, 1842) (synonym)
13. Species Eolis bicolor Kelaart, 1858 accepted as Samla bicolor (Kelaart, 1858) (unaccepted > superseded combination)
14. Species Eolis bostoniensis Couthouy, 1838 accepted as Facelina bostoniensis (Couthouy, 1838)
15. Species Eolis cacaotica W. Stimpson, 1855 accepted as Anteaeolidiella cacaotica (W. Stimpson, 1855) (unaccepted > superseded combination)
16. Species Eolis campbellii Cunningham, 1871 accepted as Aeolidia campbellii (Cunningham, 1871) (original combination)
17. Species Eolis carnea Alder & Hancock, 1854 accepted as Favorinus branchialis (Rathke, 1806) (synonym)
18. Species Eolis cingulata Alder & Hancock, 1847 accepted as Eubranchus cingulatus (Alder & Hancock, 1847) accepted as Eubranchus vittatus (Alder & Hancock, 1842) (original combination)
19. Species Eolis concinna Alder & Hancock, 1843 accepted as Cuthona concinna (Alder & Hancock, 1843) accepted as Cuthonella concinna (Alder & Hancock, 1843)
20. Species Eolis conspersa Dalyell, 1853 accepted as Cuthona foliata (Forbes & Goodsir, 1839) accepted as Trinchesia foliata (Forbes & Goodsir, 1839) (synonym)
21. Species Eolis conspersa P. Fischer, 1869 accepted as Spurilla neapolitana (Delle Chiaje, 1841) (unaccepted > junior subjective synonym)
22. Species Eolis cristata Delle Chiaje, 1841 accepted as Janolus cristatus (Delle Chiaje, 1841) accepted as Antiopella cristata (Delle Chiaje, 1841) (original combination)
23. Species Eolis curta Alder & Hancock, 1843 accepted as Facelina bostoniensis (Couthouy, 1838)
24. Species Eolis deaurata Dalyell, 1853 accepted as Cuthona caerulea (Montagu, 1804) accepted as Trinchesia caerulea (Montagu, 1804) (synonym)
25. Species Eolis diversa Couthouy, 1839 accepted as Flabellina verrucosa (M. Sars, 1829) accepted as Coryphella verrucosa (M. Sars, 1829) (synonym)
26. Species Eolis drummondi W. Thompson, 1844 accepted as Facelina bostoniensis (Couthouy, 1838)
27. Species Eolis elegans Alder & Hancock, 1845 accepted as Caloria elegans (Alder & Hancock, 1845)
28. Species Eolis exigua Alder & Hancock, 1848 accepted as Eubranchus exiguus (Alder & Hancock, 1848) (original combination)
29. Species Eolis farinacea W. Stimpson, 1853 accepted as Aeolidia papillosa (Linnaeus, 1761) (unaccepted > junior subjective synonym)
30. Species Eolis farrani Alder & Hancock, 1844 accepted as Amphorina farrani (Alder & Hancock, 1844) (original combination)
31. Species Eolis flavescens Friele & Hansen, 1876 accepted as Eubranchus pallidus (Alder & Hancock, 1842) accepted as Amphorina pallida (Alder & Hancock, 1842) (synonym)
32. Species Eolis glauca Alder & Hancock, 1845 accepted as Aeolidiella glauca (Alder & Hancock, 1845) (original combination)
33. Species Eolis glaucoides Alder & Hancock, 1854 accepted as Calma glaucoides (Alder & Hancock, 1854) (original combination)
34. Species Eolis glotensis Alder & Hancock, 1846 accepted as Cuthona caerulea (Montagu, 1804) accepted as Trinchesia caerulea (Montagu, 1804) (synonym)
35. Species Eolis gracilis Alder & Hancock, 1844 accepted as Coryphella gracilis (Alder & Hancock, 1844) (original combination)
36. Species Eolis grossularia P. Fischer, 1869 accepted as Berghia verrucicornis (A. Costa, 1867)
37. Species Eolis gymnota Couthouy, 1838 accepted as Cuthona gymnota (Couthouy, 1838) accepted as Catriona gymnota (Couthouy, 1838)
38. Species Eolis hystrix Alder & Hancock, 1842 accepted as Eubranchus cingulatus (Alder & Hancock, 1847) accepted as Eubranchus vittatus (Alder & Hancock, 1842) (ICZN opinion 774: placed on the official index of invalid and rejected names)
39. Species Eolis hyxtrix Alder & Hancock, 1842 accepted as Eubranchus cingulatus (Alder & Hancock, 1847) accepted as Eubranchus vittatus (Alder & Hancock, 1842) (Junior primary homonym of Eolidia hystrix Otto, 1821. Placed in the Official Index of Rejected and Invalid Specific Names in Zoology by ICZN (Opinion 774). Name No. 869.)
40. Species Eolis inornata Alder & Hancock, 1845 accepted as Aeolidiella glauca (Alder & Hancock, 1845)
41. Species Eolis landsburgii Alder & Hancock, 1846 accepted as Edmundsella pedata (Montagu, 1816) (synonym)
42. Species Eolis leuckartii (Vérany, 1853) accepted as Diaphoreolis viridis viridis (Forbes, 1840) (dubious synonym)
43. Species Eolis mananensis W. Stimpson, 1853 accepted as Flabellina verrucosa (M. Sars, 1829) accepted as Coryphella verrucosa (M. Sars, 1829) (unaccepted > junior subjective synonym)
44. Species Eolis militaris Alder & Hancock, 1864 accepted as Caloria militaris (Alder & Hancock, 1864) (unaccepted > superseded combination)
45. Species Eolis minuta Alder & Hancock, 1842 accepted as Eubranchus pallidus (Alder & Hancock, 1842) accepted as Amphorina pallida (Alder & Hancock, 1842) (synonym)
46. Species Eolis molios Herdman, 1881 accepted as Cuthona caerulea (Montagu, 1804) accepted as Trinchesia caerulea (Montagu, 1804) (synonym)
47. Species Eolis nana Alder & Hancock, 1842 accepted as Cuthona nana (Alder & Hancock, 1842)
48. Species Eolis neapolitana Delle Chiaje, 1841 accepted as Spurilla neapolitana (Delle Chiaje, 1841) (original combination)
49. Species Eolis northumbrica Alder & Hancock, 1844 accepted as Diaphoreolis stipata (Alder & Hancock, 1843) (probable synonym)
50. Species Eolis obtusalis Alder & Hancock, 1842 accepted as Aeolidia papillosa (Linnaeus, 1761) (synonym)
51. Species Eolis ocellata Alder & Hancock, 1864 accepted as Dunga ocellata (Alder & Hancock, 1864) accepted as Eubranchus ocellatus (Alder & Hancock, 1864) (original combination)
52. Species Eolis olivacea Alder & Hancock, 1842 accepted as Cuthona foliata (Forbes & Goodsir, 1839) accepted as Trinchesia foliata (Forbes & Goodsir, 1839) (synonym)
53. Species Eolis pallida Alder & Hancock, 1842 accepted as Amphorina pallida (Alder & Hancock, 1842) (original combination)
54. Species Eolis pallidula Lafont, 1871 accepted as Aeolidiella glauca (Alder & Hancock, 1845)
55. Species Eolis papillosa (Linnaeus, 1761) accepted as Aeolidia papillosa (Linnaeus, 1761)
56. Species Eolis peachii Alder & Hancock, 1848 accepted as Cuthona nana (Alder & Hancock, 1842) (synonym)
57. Species Eolis pellucida Alder & Hancock, 1843 accepted as Carronella pellucida (Alder & Hancock, 1843)
58. Species Eolis peregrina Delle Chiaje, 1841 accepted as Berghia coerulescens (Laurillard, 1832)
59. Species Eolis picta Alder & Hancock, 1847 accepted as Eubranchus pallidus (Alder & Hancock, 1842) accepted as Amphorina pallida (Alder & Hancock, 1842) (synonym)
60. Species Eolis plumata Dalyell, 1853 accepted as Aeolidia papillosa (Linnaeus, 1761) (synonym)
61. Species Eolis punctata Alder & Hancock, 1845 accepted as Facelina annulicornis (Chamisso & Eysenhardt, 1821) (dubious synonym)
62. Species Eolis pustulata Alder & Hancock, 1854 accepted as Zelentia pustulata (Alder & Hancock, 1854) (original combination)
63. Species Eolis robertianae M'Intosh, 1865 accepted as Amphorina farrani (Alder & Hancock, 1844)
64. Species Eolis rosea Alder & Hancock, 1842 accepted as Aeolidia papillosa (Linnaeus, 1761) (synonym)
65. Species Eolis rufibranchialis G. Johnston, 1832 accepted as Coryphella verrucosa (M. Sars, 1829) (synonym)
66. Species Eolis salmonacea Couthouy, 1838 accepted as Ziminella salmonacea (Couthouy, 1838)
67. Species Eolis sanguifera Dalyell, 1853 accepted as Cuthona gymnota (Couthouy, 1838) accepted as Catriona gymnota (Couthouy, 1838) (synonym)
68. Species Eolis sanguinea Norman, 1877 accepted as Aeolidiella sanguinea (Norman, 1877) (original combination)
69. Species Eolis smaragdina Alder & Hancock, 1851 accepted as Microchlamylla gracilis (Alder & Hancock, 1844) accepted as Coryphella gracilis (Alder & Hancock, 1844) (synonym)
70. Species Eolis stipata Alder & Hancock, 1843 accepted as Diaphoreolis stipata (Alder & Hancock, 1843) (unaccepted > superseded combination)
71. Species Eolis tenuibranchialis Alder & Hancock, 1845 accepted as Facelina bostoniensis (Couthouy, 1838)
72. Species Eolis tricolor (Forbes, 1838) accepted as Eubranchus tricolor Forbes, 1838 (synonym)
73. Species Eolis unilineata Alder & Hancock, 1864 accepted as Phidiana unilineata (Alder & Hancock, 1864) (original combination)
74. Species Eolis ventilabrum Dalyell, 1853 accepted as Tenellia adspersa (von Nordmann, 1845) (synonym)
75. Species Eolis violacea Alder & Hancock, 1844 accepted as Eubranchus tricolor Forbes, 1838 (synonym)
76. Species Eolis vittata Alder & Hancock, 1842 accepted as Eubranchus vittatus (Alder & Hancock, 1842) (original combination)
77. Species Eolis attenuatus Couthouy, 1852 (uncertain > taxon inquirendum)
78. Species Eolis cuvieri Lamarck, 1819 (uncertain > nomen dubium)
79. Species Eolis cyanella Couthouy, 1852 (uncertain > taxon inquirendum)
80. Species Eolis gigas A. Costa, 1866 (uncertain > nomen dubium)
81. Species Eolis purpurea W. Stimpson, 1853 (uncertain > nomen dubium)
82. Species Eolis skinneri Kelaart, 1859 (uncertain > unassessed)
83. Species Eolis timida Trinchese, 1873 (uncertain > taxon inquirendum)

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