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Show 238 MR. P. S. ABRAHAM ON THE [Mar. 6, b. Centre of back without filaments. Inner lingual spines recurved and denticulate; external spines hooked. Spinous collar incomplete and bilobed. 5. IDALIA ASPERSA, Aid. & Hanc, Mon. Br. Nud. Moll. p. 46, pt. 1, fam. 1. pl. 26 (1845). I. cirrigera, Loven. ? 1. caudata, G3rst. Hab. North European coasts. 6. I. IN;EQ.UALIS, Forbes & Hani. Brit. Moll. iii. p. 579, pl. 20. f. 4 (1853). Hab. Shetland Isles. 7. I. QUADRICORNIS, Forbes & Hani. Doris quadricornis, Montagu, Linn. Trans, xi. p. 17, pl. 4. f. 4 (1815). Hab. South coast of England (Devonshire). 8. I. PULCHELLA, Aid. & Hanc I. c. p. 46, and Append, p. v (1855). Hab. South coast of England (Cornwall). Genus ANCULA, Loven, 1846. Miranda, Alder & Hancock, 1847 ; Drepania, Lafont, 1874. Body limaciform, smooth. Mantle obsolete, forming an indistinct ridge near the branchiae, bearing one or more appendages. Rhinophores laminate, bearing styliform basal appendages. Head produced at the sides into tentacular processes. Odontophore with four spines in each transverse row, the two next the median line large and broad, with the inner margin denticulated; no central spine. A spinous buccal collar. M. Lafont states his Drepania to differ from Ancula in the head bearing two elongated tentacles analogous to those of Eolis, in the branchiae not being surrounded by linear appendages, and in the rhinophore carrying but one filament instead of two. Unless the lingual characters prove to be importantly different from those of Ancula, it would seem advisable to unite Drepania with the latter genus. a. With several appendages near the branchiee. 1. A. CRISTATA, Loven. Polycera cristata, Alder, Ann. & Mag. Nat. Hist. vi. p. 340, t. ix. f. 10-12 (1841). Miranda cristata (Ancula cristata in text), Aid. & Hanc. Hab. North European shores. 2. A. SULPHUREA1, Stimpson, Mar. Inv. of Grand Manan, p. 26 (1853). Hab. Eastern North America (Grand Manan). 1 It is doubtful whether this be not a variety of A. cristata. |