NARRATIVE OF THE CRUISE. 
695 
form, to which the name Bathydoris abyssorum (figs. 237, 238) has been given, is perhaps 
the largest Nudibranchiate Mollusc hitherto known, measuring 12 cm. in length, after long 
immersion in spirit. When alive it was transparent and gelatinous in consistency ; the 
rhinophoria were brown, the gills and protruding external genital organ orange, and the 
foot dark purple. In shape it is subglobular, somewhat resembling the genus Kalinga 
of Alder and Hancock. The gigantic bulbus pharyngeus resembles rather that of Bornella 
and other Tritoniadse ; the labial disk is thus unarmed and the powerful mandibles are 
covered by a thick muscular mass. The radula is not unlike that of the Tritoniadse, pos- 
sessing as it does a median tooth and a series of lateral teeth, but the first lateral tooth is 
quite similar to the rest, whereas in the Tritoniadse it is different. On the whole Bathydoris 
appears to form a remarkable connecting link between the Tritoniadse and the Dorididse. 
It was taken at Station 271 in the middle of the Pacific from a depth of 2425 fathoms. 
“ A second form obtained by Mr. Murray in the ‘ Triton ’ from 608 fathoms, in the 
Fseroe Channel, has been made the type of a new genus, and has been named Cuthonella 
abyssicola. This novel form, for which I have established the generic name Cuthonella, 
somewhat resembles Cratena and Cuthona, but differs in some comparatively essential 
points. The anus, instead of being situated upon the side of the body, is dorsal and 
slightly lateral. The dorsal papillae are not inflated ; they are set in transverse or oblique 
rows, which are crowded together so as to form a few larger groups. In the specimen 
examined the cnidophorous bags were absent. The foot is not very broad, its anterior 
margin is truncated. The mandibles are somewhat short, the masticatory edge provided 
with several series of strong denticles. The radula has a single series of rather large 
teeth, with a denticulate cutting edge. The penis is unarmed.” 
(narr. chall. exp. — vol. i. — 1885 .) 
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