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Show 920 MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. [Nov. 28, Subfam. DONACIN^E. 53. DONAX (LATONA) DELTOIDES. Donax deltoides, Lam. Anim. sans Vert. vi. p. 241. D. epidermia, Lam.; Reeve, Conch. Icon. Donax, pl. 1. f. 4 a, b. This fine species is abundant on most of the sandy beaches of Australia which are exposed to the surf. It ranges from Swan River to Moreton Bay. In colour it varies from greenish olive to purple, and sometimes orange-yellow. Outer Manly Beach, in sand at low water. Length 2\ inches. Subfam. PAPHIIN^E. 54. DONACILLA ELONGATA. Mesodesma elongata, Desh.; Reeve, Conch. Icon. Mesodesma, pl. 1. f. 5. Triangularly elongated, and at the posterior side short and truncated ; covered with a shining yellowish-olive epidermis. Buried in sand at low tide. Botany Bay. Length 1 inch I line. This species has a wide range to South Australia, Tasmania, and Swan River. 55. *DoNACILLA OBTUSA. Mesodesma obtusa, Crosse & Fischer, Journal de Conch. 1864, p. 350. An ovate species, of a waxy white, roundly truncate behind, and compressed and wedge-shaped in front, with a light-brown epidermis towards the margins. From the Sand-spit, Middle Harbour. Length 9 lines. This species is common at Port Lincoln, in South Australia. Fam. VENERID^E. Subfam. VENERIN^E. 56. V E N U S LAQUEATA. Venus laqueata, Sow. Thes. Conch, xi. pl. 153. f. 15; Reeve, Conch. Icon. Venus, pl. 6. f. 20. This noble species is characterized by the concentric ridges forming erect crenated frills, the interstices between which are regularly longitudinally ribbed. Colour pale fulvous, sometimes rayed with four indistinct brown bands. Dredged in sandy mud iu Port Jackson. Length 3 inches. Found also at Moreton Bay. 57. CHIONE STRIATISSIMA. Venus striatissima, Sow. Thes. Conch, p. 44, pl. 157. f. 103-105; Reeve, Conch. Icon. Venus, pl. 26. f. 135. A pretty little pointed ovate species, cancellated with concentric waved ridges and longitudinal striae; in general aspect somewhat like the British V. ovata, Penn. Dredged at Watson's Bay &c. Length 8 lines. |