146 PROCEEDINGS OP THE MALACOLOGICAL SOCIETY. 



It appears probable, however, that all these names have been 

 given to one and the same species. Bergh in 1879 (8, p. 86) gives as 

 synonyms L. marinus, F. nohilis, F. atlantica, and H. elegantissima. 

 Eliot, again (14, p. 166), in 1910, regards L. marinus, F. nohilis, 

 and F. atlantica as identical. 



Bergh also, in 1879 (8, p. 86), in 1884 (9, p. 9), and again in 1894 

 (11, pp. 130-131), also suggests that Eolidia pinnata, Esch., Molis 

 longicauda, and E. alba are also to be regarded as synonymous. The 

 last of these is apparently still somewhat doubtful, for the same 

 author says of it in 1887 (10, p. 310) : " Diese, von van Hasselt durch 

 zwei Figuren illustrierte Form, lasst sich weder durch den Text, 

 noch durch die Figuren generich bestimmen ; vielleicht konnte sie 

 einen Proctonotus darstellen." The same author includes as synonyms 

 his own Fionu pinnata of 1873 (6) and 1874 (7). Further, in 1879 

 (8, p. 86) and in 1894 (11, p. 130) he terms the species on the Pacific 

 Coast F. marina var. pacifica. But as far as can be ascertained from 

 these accounts, the animals are fairly typical examples of F. murina, 

 and the addition of var. pacijica does not indicate any particular 

 variety of form, but simply that they came from the Pacific Coast. 



If the foregoing identifications are correct, as seems probable in 

 all save that of E. alba, van Hass., then Fiona marina is one of the 

 most widely distributed species known and, for most areas, one of the 

 earliest recorded forms. It is known from the Indian Ocean, the 

 Atlantic Coast of North America, the Pacific Coast of North America 

 from Alaska and California, the Australian Seas, the New Zealand 

 Seas, the Japanese Seas, the Madagascar Seas, the European SeaS; 

 the Eastern Atlantic and the Mediterranean Sea. 



As the result of Casteel's work, its larval development is more 

 fully known than is that of other nudibranch. 



Its synonymy is, therefore, as follows : — 



Family FIONID^, Eliot, 1910. 



Genus Fiona, Alder and Hancock, 1853 and 1855. 

 Species Fiona marina, Forskal; 1775. 



Synonymy : Limax marinus, Forskal 1775. 

 Eolidia alba, van Hasselt, 1824. 

 Eolidia pinnata, Eschscholtz, 1831. 

 Molis longicauda, Quoy et Gaimard, 1832. 

 Oithona nohilis. Alder and Hancock, 1851. 

 Fiona nohilis, Alder and Hancock. 1853. 

 Fiona nohilis. Alder and Hancock, 1855. 

 Fiona atlantica, Bergh, 1858. 

 Hymenceolis elegantissima, Costa, 1866. 

 Fiona pinnata, Bergh, 1873 and 1874. 

 Fiona marina var. pacifica, Bergh, 1879-1894.' 

 Fiona marina, Casteel, 1904. 

 Fiona marina, Eliot, 1910. 



