262 SCIENTIFIC RESULTS OF THE 
only in the armature of the tongue, which in the Colge exhibits 
only a single series of (false) rhachidian plates and (on each 
side) two lateral plates in form approaching those of Polycera. 
The nature of the prostate is unknown; the armature of the 
penis not differing much from that ordinary in the large group of 
the Polyceratide. 
Although somewhat approaching to the Huplocami in the form 
of the appendices of the back, in the armature of the true mouth 
and of the pleure of the tongue, the Zriophe still entirely differ 
in the form of the tentacles, in the number of the branchial 
leaves and very likely in the nature of the prostate. 
The Triophe have. hitherto been only found in the Pacific 
Ocean. 
1. Tr. modesta, Bgh. n. sp. Oc. Pacificum. : 
2. Tr. Carpenteri, Stearns. Proc. of the Cal. Acad. of Sci., April 7, 1878, 
p- 2, fig. 2. Oc. Pacificum (California). 
Tr. modesta, Bgh.n.sp. Pl. XIV, fig. 17-20; Pl. XV, fiz. 1-10. 
? Triopa Carpenteri, Stearns. |. c. p. 2, fig. 2, 
Color e flavido albescens. Appendices dorsales paucz ; folia 
branechialia 5. 
flab. Oc. Pacif. septentr. 
Of this form Dall has obtained a single individual at Yukon 
Harbor (Shumagins), in August, 1874, at a depth of six to 
twenty fathoms, on a bottom of sand and stones. The color of 
the living animal was, according to Dall, * yellowish-white.” 
The animal preserved in spirits was of whitish color; the 
dorsal appendices, the gill and the rhinophoria more yellowish. 
The length of the animal 16.0 mm., by a height of 7.0 and a 
Dorsum papilligerum, presertim margo frontalis et dorsalis. Branchia 
pauci (4-5) foliata. 
Mandibule triangulares, fortes. Radula fere ut in Polyceratis, dentibus 
lateralibus (2) et externis (7), sed preterea dentibus medianis (spuriis) 
instructa. 
Merely one species of the genus is yet known, one of the first described 
Nudibranchiata, the Doris lacera of Abildgaard (Zool. Dan., IV, 1806, 
p. 28, Tab, CX XXVIII, fig. 3, 4), which has been found too on the coast 
of America (Cf. Verrill, notice of recent addit. to the Mar. Fauna of 
North Am., XXXVIII. Amer. Jour. of Sc. and Arts, XVI, 1878, p. 211). 
