954 SCIENTIFIC RESULTS OF THE 
the right anterior half excavated (on account of the anterior genital 
mass); the color brownish-gray. 
The heart and the sanguineous gland as usual, also the renal cham- 
ber and the renal syrinx. 
The hermaphroditic gland by its yellowish color contrasting with 
the liver, clothing the under side, part of the left side, and its right 
anterior half. The anterior genital mass rather compressed, about 
6.0 mm. long by a breadth of 2.0mm. The ampulla of the hermaphro- 
ditic duct rather short, sausage-shaped, about 2.3 mm. long, curved 
and whitish. The larger part of the penis was gone, but hooks were 
seen in the remaining part as in the typical species. The sperma- 
totheca rather large, bag-shaped, about 3.5 mm. long; the vagina 
rather wide, about 10.0 mm. long. ‘The mucous gland white, and the 
albuminous gland yellowish-white.! 
This species seems very distinct from the typical one, by its color 
and by the different form of denticulation of the large plates of the 
tongue. 
POLYCERATID/:. 
This large family, so rich in generic forms, was found represented 
in the northern Pacific only by two generic types, Polycera and 
Triopha. 
POLYCERA, Cuvier. 
Polycera, Cuvier, (1812?), Regne-anim., 1817, ii, p. 390.2 .Regne-anim., 
ed. 2) iii, p. 52. ‘ 
Themisto, Oken, Lehrb. der Zool., 1815, p. 278. 
Cufea, Leach, Moll. Britann. Synopsis, 1852, p. 21. 
Polycera C, Ald. and Hane., Observ. on the genus Polycera, Ann. Mag. 
of Nat. Hist., vi, 1841, p. 387-342, Pl. IX. 
Limacia, O. Fr. Miller, Zool. Dan., i, 1781, p. 65-68.° 
Phanerobranchus, A. Frédol (Moquin-Tandon), Le monde de la mer, 1864, 
Pl cil figs; 2. 
1 The anterior genital mass was so hardened and altered, that the nature 
of its different components could not be determined with certainty. 
* According to a note of Hermannsen, under the genus Themisto, Oken, 
(Ind. Gen. Malacoz. primordia, ii, 1849, p. 572), the genus Polycera was 
established by Cuvier, 1812, [but this is probably a typographical error, 
since, under the genus Polycera itself, he indicates only the year 1817— 
Darr, |iletleic:, pe older 
* Limacta, Hartm., Neue Alpina, i, 1821, p. 208 (Arden, Fér.). 
