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Show 234 MR. P. S. ABRAHAM ON THE [Mar. 6, 3. CERATOSOMA GRACILLIMUM, " Semper," Bgh in Semper's ' Reise im Arch. d. Phil.' 2te Th. 2te Bd. Heft v. T. 25. p. 8 (1873), & Heftx. p. 403 (1876). Hab. Philippine sea. 4. C. CALEDONICUM, Fischer, Journ. de Conch, ser. 3, torn. xvi. p. 92 (1876). Hab. New Caledonia. 5 C TENUE, Abraham, Ann. & Mag. Nat. Hist. 4th ser. xviii. p. 141, pl. 7. f. 5, 5 a, 5 6 (1876). Hab. ? 6. C. BREVICAUDATUM, id. I. c. p. 142, pl. 7. fig. 6. Hab. Australia. 7. C. OBLONGUM, id. I. c. p. 143, pl. 7. f. 7,7 a, 7 b. Hab. W. Australia. 8. C? WEBBII1. Polycera webbii, D'Orbigny, Hist. Nat. des iles Canar. ii. " Moll." p. 41, pl. 4. f. 8-10 (1837). Goniodoris webbii, Gray ; Doriprismatica webbii, H. & A. Ad. Hab. Canary Isles. Gen. TREVELYANA, Kelaart, 1858. Gymnodoris, Stimpson2, 1855. Stenodoris, Pease3, 1866. Body limaciform, rather swollen or raised on the central region. Mantle obsolete. No appendages. Rhinophores laminate and retractile. Branchiae pinnate, non-retractile, placed round the anus almost on the centre of the back. Mouth without oral tentacles or veil, and without collar or jaws. Odontophore broad, bearing simple spines. 1 T. CEYLONICA, Kel. Ann. & Mag. Nat. Hist. 3rd ser. i. p. 257, pl. IOB. f. 1,2(1858). T. zeylanica, id. Hab. Ceylon. 1 This may prove to be the type of a new genus; from D'Orbigny's description it would seem to be intermediate in character between Ceratosoma and Polycera. 2 Stimpson's diagnosis is:-"Limaciform, smooth. Similar to Polycera, but different in wanting branchial appendages and a veil. Branchiae likewise simple." It seems to m e that there is little doubt that this is synonymous with Kelaart's genus. The name Trevelyana, however, has been generally employed, although enunciated three years subsequently to Gymnodoris; and, moreover, w e cannot be quite sure of their identity until Stimpson's specimens be properly examined. 3 Mr. Pease's Stenodoris does not appear to differ essentially from Kelaart's genus. H e states that " the body is deeply incised on either side, a short distance behind the dorsal tentacles," and that the branchiae are " subretractile." |