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Show 1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 225 CALYCIDORIS GUENTHERI, Abraham, Ann. & Mag. Nat. Flist. 4th ser. vol. xviii. p. 133, pl. 6. f. 1, 1 a-\ c (1876). Hab. ? Gen. LAMELLIDORIS, Aid. & Hanc. 1855. Onchidoris, De Blainv. 1816'. Onchidiorus, Ferussac, 1821. On-chidora, Cuv., 1830. Villiersia, D'Orbigny, 1837. Oncidiodoris, Agassiz, 1847. Oncodoris, Agassiz, 1847. Body depressed. Mantle large. Head with a veil in place of oral tentacles. Branchiae simply pinnate, set in an open circle or ellipse, non-retractile. Odontophore narrow, with a few spines in each transverse row. This genus contains two well-defined divisions, first enunciated by Messrs. Alder & Hancock. a. Body not very depressed; mantle with moderate-sized spicula. Spawn of few coils, cup-formed. Odontophore with two large spines and two or more rudimentary ones; usually a simple central plate. 1. L. ASPERA, Aid. & Hanc. Doris aspera, id. Ann. & Mag. Nat. Hist. ix. p. 32(1842), figured in Mon. Br. Nud. pl. 9. f. 1-9. D. pallida, Agassiz. 1 D. fusca, Fabricius2. Hab. North European shores ; eastern coast of North America. 2. L. ACUTIUSCULA. D. acutiuscula, "Stp.," Moller, Index Moll. Grdn. in Nat. Tidssk. iv. p. 79 (1842-3). Hab. Eastern coast of North iVmerica. 3. L. PROXIMA, Aid. & Hanc. D. proximo, id. Mon. Brit. Nud. p. 42, and pt. 6, fam. 1, pl. 9. f. 10-16(1854). Hab. Danish and English coasts. 4. L. LOVENI. D. muricata, " Miiller," Loven, Index Moll. Lit. Scand. &c. p. 5 (1846). D. loveni, Aid. & Hanc. Hab. North-European shores. 1 Onchidoris was constituted by De Blainville in 1816 for a supposed species ("0. leachii") which we now know to be L. bilamellata, his specimen being still existing in the collection of the British Museum. This was pointed out by Alder and Hancock, and the erroneous characterization exposed, in 1854; nevertheless compilers of Zoological text-books and reference-books still continue to talk of " Onchidoris leachii;" and several of them have taken Onchidoris, in spite of its hypothetical characters, as the name of the whole genus. 2 Morch considers it identical with D. fusca, Miiller, and with D. muricata, Meyer and Mobius (non Miiller). P R O C ZOOL. Soc-1877, No. XV. 15 |