EEPOET ON THE NUDIBEANCHIATA. 
109 
Bathydoris, n. gen. 
Corpus fere semiglobosum, molle; dorsum papillis conicis parvis ubique sparsis, 
margiue palliali vix ullo ; rhinopboria retractilia clavo perfoliato ; teutacula sat magna, 
nonnihil applanata, acuminata ; branckia e fasciculis discretis compluribus (6) fruticulosis 
non retractilibus formata ; podarium sat latum. 
Bulbus pharyngeus permaguus ; armatura labialis nulla ; mandibulse magnse, sat 
applanatse, margine masticatorio kevi, processu masticatorio nullo ; series radulse multi- 
dentatm, dens medianus nonnihil compressus, dentes laterales hamati, interni parte 
basali latiori, reliqui angustiori. — Penis conicus inermis, glande pagina inferiore fissura 
instructa. 
This remarkable genus differs from all other Dorididse proper in the semiglobular 
form of the body, which is something like the genus Kalinga of Alder and Hancock, 1 
which it also resembles in the characters of its branchia composed of several separate 
branchial tufts, and in the development of soft conical papillae upon the bach. Bathydoris 
has no frontal appendages, and the dorsal margin is very slightly pronounced. In its in- 
ternal structure, however, Bathydoris differs entirely from Kalinga and other Polyceradm. 
The gigantic bulbus pharyngeus differs from the same organ in all other Dorididse, 
and resembles rather that of Bornella 2 and other Tritoniadse; the labial-disk is unarmed, the 
powerful mandibles are covered by a thick muscular mass. The radula is not unlike that 
of the Tritoniadse, possessing 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. The hermaphrodite gland is separate from the liver, as in Bornella and 
Scyllcea. The penis is unarmed as in the Tritoniadse. Bathydoris appears to form a 
remarkable connecting link between the Tritoniadce and the Dorididce, with which latter 
group it agrees in possessing a blood gland. 
Bathydoris abyssorum, n. sp. (PI. XII. figs. 14-20 ; PI. XIII. figs. 1-25 ; PI. XIV. 
figs. 1-15). 
Corpus quasi subgelatinosum, subpellucidum. Rhinophoria et tentacula brunnea, 
branchia et genitalia externa aurantiaca, podarium e nigro purpureum. 
Habitat. — Pacific. 
One specimen of this large species was taken in the middle of the Pacific, at Station 
271, lat. 0° 33' S.,long. 151° 34' W., from a depth of 2425 fathoms; bottom temperature, 
l o- 0 C. ; bottom, globigerina ooze. The specimen was fairly well preserved in alcohol. 
According to Mr. Murray’s notes “ the body of the living animal was gelatinous and 
1 Alder and Hancock, Notice of a Collection of Nndibrancliiate Mollusca made in India, Trans. Zool. Soc., vol. v. 
part 3, 1864, pp. 134-136, pi. xxxii. figs. 7-10. 
2 Bergh, Malacolog. Untersuch., loc. cit., Heft vii., 1874, pp. 289-308. 
