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MARINE MOLLUSCA. 625anteriores squamis transversis subgrauuliformibus subconfeitis instructae, posteriores haud granulataesed transversim tenuissime striatae.Longit. 15 mm., alt. 12, diam. 8i.Remarkable for its somewhat compressed and quadrate form, the slender radiating sulci andthe slightly raised ribs, of which only the anterior half bear transverse granules, those on thehinder half of the shell being only very finely transversely striated. The colour is entirely whiteexcepting the dorsal margin just in front of the umbones, which is stained with pink.341. Cardium sueziense, Issel, 21, 39, a. II, X, XV.342. Cardium (Laevicardium) lobulatum, Deshayes, 12, c. II, III, V, VII.343. Cardium (Laevicardium) australe, Sowerbj', 37,//. TX, XII, XIII, XV.344. Cardium (Laevicardium) biradiatum, Bruguiere, 37, //. V, VII, IX, XII.34-5. Cardium (Ctenocardia) victor, Angas, 4. VIII.The ribs on the greater part of this beautiful shell are alternately larger and smaller, theformer being spinosely squamate and the latter only very delicately scaled. On the posterior endthe costae are about equal in stoutness and ornamented with short scale-like spines.346. Cardium (Ctenocardia) fornicatum, Sowerby, 37, //. V, X.FamilyCHAMIDAE.347. Chama jukesi. Reeve, 37, /T. I.348. Chama imbricata, Broderip, 37, IV. IX.FamilyCYPRINIDAE.349. Meiocardia lamarckii. Reeve, 37, //. V.350. Trapezium oblongum, Linn. 37,/. V.FamilyVENERIDAE.351. Venus reticulata, Linn. 37, Z/F. I, IX.352. Venus marica, Linn. 37, XIV. IX, XV.353. Venus recognita, Smith, 39, a. II.