230 MR. P. S. ABRAHAM ON THE [ Mar. 6, 
genus Euplocamus for the E. croceus of Philippi. The differences 
between the two genera, however, appear to be more of degree than of 
kind, and serve better for distinguishing sections of one genus ; more- 
over the latter name is in general use for a genus of Insects, as well 
as for a genus of Birds. Huplocamus originally tookin the Idalie. 
Oken’s Themisto included Polycera quadrilineata and Triopa 
clavigera. 
a. The lateral marginal processes linear or subclavate ; oral tentacles 
cylindrical ; the two inner lateral plates of the odontophore 
bearing large spines. 
1. TrRIoPA CLAVIGERA, Johnston. 
Doris clavigera, Miiller, Zool. Dan. Prod. p. 229 (1776). 
Tergipes pulcher, Johnst.; Polycera claviger, Sars; Euplo- 
camus plumosus, Thompson ; Euplocamus claviger, Thompson. 
Hab. North European coasts. 
2. T. LACERA. 
Doris lacera, Miller, Zool. Dan. iv. p. 23, t. 138, f. 3, 4 (1806). 
T. lacera, ‘‘ Miller,’ Lovén. 
Hab. Scandinavian seas. 
3. T. rvcrsa, M. Sars, On some Remark. Forms, &c. i. p. 35, pl. 3. 
f. 1-3 (1872). 
Hab. Coast of Norway (Christiana). 
4, T. caTaLin#, Cooper, Proc. Cal. Ac. Nat. Sc. iii. p. 59 (1863). 
Hab. Coast of Western North America (Catalina Island). 
5. T. CARPENTERI, Stearns, Proc. Cal. Ac. Nat. Sci. v. p. 78 
(1873). 
Hab. Monterey (California). 
6. T. HOLBOLLII. 
Euplocamus holbéllii, Moller, Ind. Moll. Greenl., in Nat. Tidsskr. 
iv. p. 79 (1842) ; Polycera holbdllii, *‘ MOll.,”’ Stimpson. 
Hab. Greenland shores. 
7. T.? eractuis, Pease, Am. Journ. Conch. vi. p. 301, pl. 19. 
f. 3, a-d. 
Hab. Huaheine. 
b. Lateral marginal processes branched or papillated; oral ten- 
tacles as ovoid lobes ; the three inner lateral plates of the very 
broad odontophore bearing large spines; a spinous buccal 
collar. 
8. T. CROCEA. 
Euplocamus croceus, Philippi, En; Moll. Sic. i. p. 103, pl. 7. f. 1 
(1836). 
