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Show 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 ; moreover the latter name is in general use for a genus of Insects, as well as for a genus of Birds. Euplocamus originally took in the Idaliee. 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. T R I O P A CLAVIGERA, Johnston. Doris clavigera, Miiller, Zool. Dan. Prod. p. 229 (1776). Tergipes pulcher, Johnst.; Polycera claviger, Sars; Euplocamus plumosus, Thompson; Euplocamus claviger, Thompson. Hab. North European coasts. 2. T. LACERA. Doris lacera, Miiller, Zool. Dan. iv. p. 23, t. 138. f. 3, 4 (1806). T. lacera, " Miiller," Loven. Hab. Scandinavian seas. 3. T. INCISA, M. Sars, On some Remark. Forms, &c. i. p. 35, pl. 3. f. 1-3 (1872). Hab. Coast of Norway (Christiana). 4. T. CATALIN^E, 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 kolbdllii, Moller, Ind. Moll. Grcenl., in Nat. Tidsskr. iv. p. 79 (1842) ; Polycera holbollii, "Moll.," Stimpson. Hab. Greenland shores. 7. T. ? GRACILIS, Pease, Am. Journ. Conch, vi. p. 301, pl. 19. f. 3, a-d. Hab. Huaheine. b. Lateral marginal processes branched or papillated; oral tentacles as ovoid lobes ; the three inner lateral plates of the very broad odontophore bearing large spines ; a spinous buccal collar. S. T. CROCEA. Euplocamus croceus, Philippi, En. Moll. Sic. i. p. 103, pl. 7. f. 1 |