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Show 232 MR. P. S. ABRAHAM ON THE [Mar. 6, Geii. PLOCAMOPHORUS, Riippell & Leuckart, 1828. Plocamoceros, Cuvier, 1830. Plocamophorus, Gray, 1842. Peplidia, Lowe, 1842. Histiophorus, Pease, 1860. Body limaciform. Mantle represented by a supracapital veil bearing tuberculate or branched appendages on the margin, and by two or three tubercular processes upon each side of the back. Rhinophores laminate. Oral tentacles flat. Branchiae few, non-retractile. Tail dorsally carinated. Odontophore with the spines near the middle bicuspid, none median in position. An incomplete buccal collar. 1. P. OCELLATUS, Riipp. & Leuck. Atl. zu der Reise nord. Afrik., "Neue Wirb. Th. des roth. Meers," p. 17, T. 5. f. 3. flab. Red Sea. 2. P. CEYLONICUS, Aid. & Hanc. Polyceral ceylonica, Kelaart, Ann. & Mag. Nat. Hist. 3rd ser. iii. p. 489 (1859); figured by Aid. &Hanc. T. Z. S. vol. v. pl. 32. f. 4-6. Hab. Coromandel and Ceylon coasts. 3. P. IMPERIALIS, Angas, Journ. de Conch, xii. p. 52, pl. 5. f. 7 (1864). Hab. New South Wales. 4. P. MACULATUS. Histiophorus maculatus, Pease, P. Z. S. 1861, p. 36. Hab. Sandwich Islands. 5. P. MADER^E. Peplidia maderee, Lowe, P. Z. S. 1842, p. 51. Hab. Madeira. 6. P. N;EVATUS, Abraham, Ann. & Mag. Nat. Hist. 4th ser. xviii. p. 139, pl. 6. f. 4, 4 a. Hab. New South Wales. 7. P. LEVIVARIUS, Abraham, Bull, de la Soc. Zool. de France, 1876, p. 287, f. 1-4. Hab. ? 8. P. ? sp.1, figured in Krusenstern's • Atlas,' T. 88. f. (1813). Hab. ? 9. P. TILESII, Bergh ; figured partially in Semper's ' Reise,' T. 51. f. 17-27, & T . 53. f. 1-4(1876). Hab. ? 10. P. RAMULOSUS. Polyceral ramulosa, Stimpson, Proc. Ac. Nat. Sci. Phil. vii. p. 379 (1855). Hab. China. 1 I have been unable to see the text of Krusenstern. In case the animal has not been named by Tilesius, I have elsewhere proposed flagellatus for its specific name, on account of the flagellate lateral prolongations of the supracapital veil. |