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Show 1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 239 b. With but one pair of appendages near the branchice. 3. A N C U L A FUSCA. Drepania fusca, Lafont, Journ. de Conchyl. xxii. p. 369 (1874). Hab. Gen. POLYCERA, Cuvier, 1817. Themisto, Oken, 1815 (part of); Cufeea, Leach, 1820; Poly cere, Risso, 1826; Polycerus, Verany, 1846. Body limaciform. Mantle indistinct, forming a supracapital veil, and a tuberculate ridge on the sides. Rhinophores laminated. Branchiae non-retractile, with lateral appendages. Odontophore with twelve to sixteen plates in each transverse row, the two near the centre large and bicuspid ; no central spine. Lateral corneous jaws. Messrs. Alder and Hancock classify the species under two well-marked divisions. a. Supracapital veil dilated, with the margin bearing tentacular filaments. Branchice simply pinnate; their lateral appendages elongated and few. 1. P. QUADRILINEATA, Sars. Doris quadrilineata, Miiller, Zool. Dan. Prod. p. 229 (1776). D. cornuta, Abildg.; D. flava, Mont.; Themisto quadrilineata, Oken; T. flava, id.; Cufeea flava, Leach; Poly cere flava, Risso; Polycera flava, Fleming ; ? P. varians, Sars ; P. ornata, D'Orb.; P. typica, Thompson; P. cornuta, Loven. Hab. North and south European coasts. 2. P. HORRIDA, Hesse, Journ. de Conch, xx. p. 345 (1870) ; figured, xxi. pl. 12. f. 1, 2. Hab. French coast. 3. P. PLEBEJA, Loven, Ind. Moll. Scand. p. 6 (1846). Hab. West Scandinavian shores. b. Supracapital veil short, bilobed, the margin tuberculate. Branchice plumose, their lateral appendages tubercular and more numerous. 4. P. OCELLATA, Aid. & Hanc Ann. & Mag. Nat. Hist. ix. p. 33 (1842). ? Triopa nothus, Johnston ; P. (Palio) ocellata, Morch. Hab. North European coasts. 5. P. LESSONII, D'Orbigny, Mag. de Zool. vii. p. 5, pl. 105 (1837). P. citrina, Alder; Doris illuminata, Gould ; P. modesta, Loven; JEgires lessonii, Gray; P. illuminata, Stimpson. Hab. North European coast, and Eastern North America (Massachusetts). 6. P. PUDICA, Loven, I. c. p. 6. flab. West Scandinavian shores. |