38 NOTES ON A COLLECTION OF CALIFORNIAN NUDIBRANCHS. 



the margin of the mantle edge, and that of the foot." The branchiae are 

 recorded as 12 in Gkr. unicersitatis, and 9 — 10 in Chr. califoniietisis, but this 

 variation can hardly be regarded as specific. 



Aeanthodoris, Gray. 



This genus, and indeed the whole fLimily to which it belongs, (including 

 Akiodorw, DoriduncuJus, Adalaria and Larnellidor is) has hiihcrio been found 

 only in the cold or temperate seas, but penetrates into Arctic waters and 

 probably also Antarctic, as it is recorded from far south. Only the rather 

 doubtful Lamellidori^ (?) (jraeifii, Bergh, is recorded from the Mediterranean. 

 Bergh enumerates 8 species of Aeanthodoris in his System, but of these 

 A. stellata, Verrillseems to owe its existence merely to a question of nomen- 

 clature.* Since then, the following species have been added : — 



8. A. inefuUfera, Bergh. 



9. A. hudsoni, Mac Farland. 



10. A. hrunnea, Mac Farland. 



11. A. (?) vafheleti, Mabille & Rochebrune. 



12. A. 7-hodoceras, n. sp. 



From Behrings Sea, and the Pacific Coast of North America are recorded 

 y^c piU>sa (typical), Ac. jiiJosa var. nlhcscens., do. var. purjmrea, Ac. coeru- 

 lescens, Ac. hudsoni, Ac. hrunnea, and Ac. rhodoceras. The common 

 British Ac. inlosa appears to have an astonishingly wide distribution, for 

 forms which Bergh regards as mere varieties of it are found in the North 

 Pacific, New Zealand and Tasmania. It is remarkable, however, that in all 

 the known southern forms, the verge is unarmed, a fact worth bearing in mind 

 when estimating the importance of this character, which is thus admitted to 

 vary within the limits of the same species. 



Aeanthodoris rhodoceras, n. sp. 



PI. vii, figs. 3, 4. 



One specimen from Dead Man's Island, San Pedro, California. It is soft, 

 flat, oval and well preserved. The notes on the living animal say that the 

 back bore hyaline papillae and also shorter black papillae. On the dorsal 

 margin was a narrow black band, edged below with yellow. The rhinophores 

 were reddish with a yellow streak, the left paler, and with more yellow than 

 the right. The length was about 1 5 millim. From a rough sketch it would 

 appear that the ground colour of the back was yellowish-grey ; the sole was 

 white. The colours are still recognizable. The back is pinkish-grey, and is 



* If I rightly understand Venill (Am Journ of Sci. and Art. 1879, p. 313), he 

 considers that his specimens = Dons stellata, Gemlin, = Doris pilosa, A. & H., but 

 are different from D. pilo\sa, Miiller. If so the animal should be called Ac. stellata 

 (Gmelin). But both Bergh and Alder & Hancock seem to regard the animal figured 

 by the latter authors (which is Gmelin's Doris stellata) as identical with Doris pilosa, 

 Miiller. If so, Ac. stellata has no separate existence. 



