25. Pinna dolabrata, Lam. Hist. 6 pt. 1 133. Pinna bicolor, Chemn. Conch. Cab. t. 90. f. 234. Icon. Chemn. 8 t. 90. f. 780 ? The shell, figured by Chemnitz, appears to be a variety of this species with the anterior end uncurved, which has most probably been caused by some injury on the anterior basal edge. The species is peculiar for its yellow pearly internal coat, and purplish rays. 2. COCHLEOPHORA. 26. Trochus caerulescens. Lam. Hist. 7 18. Icon. Ency. Meth. plate 444. f. 2. a, b. Inhab. South-west Coast. Lamarck describes this shell from a specimen found by Peron. 27. Trochus noduliferus, Lam. Hist. 7 18. 28. Monodonta conica (n.s.) Testa conica, acuta, imperforata, spiraliter striflto-costata, rufa; costis subtuberculatis, albo-nigro-articulatis; apertura sulcata. Inhab. -- Mus. Brit. Shell conical, axis longer than the diameter, the whorl flattened with six spiral raised substriae, which are transversely divided into blackish purple beads with white interspaces, the apex rather acute; the base, rather convex, axis imperforated; the aperture subquadrangular, inside furrowed; the base of the columella lip with a prominent tooth and distinct groove behind it, the upper part rugose; axis eight-twelfths, diameter six-twelfths of an inch. This shell does not appear to be uncommon on the coast of Australia. 29. Monodonta uranulata (n.s.) Testa depresso-conica, umbilicata, purpurea, albomarmorata, spiraliter papillata; papillis quadri-seriatis, umbilico laevi; infima facie papillata, apertura sulcata. Inhab. Mus. Brit. Shell rather depressed, conical, purple variegated with white, generally concentrically wrinkled, and ornamented with granulated spiral ribs, the ribs of the upper part of the last, and of all the other whorls rather distant, and forming four series; those of the under part rather closer, and smaller. The axis unbilicated, smooth, the aperture roundish, the outer lips furrowed, the columella lip smooth with a groove at its base, axis four-twelfths, diameter five-twelfths of an inch. 30. Monodonta denticulata (n.s.) Testa depresso-conica, umbilicata, rufa, nigro punctata, spiraliter sulcata, subgranulata, umbilico extus crenato. Inhab. -- Mus. Brit. Shell depressed, conical, pale reddish, ornamented with rows of white and brown spots, spirally grooved, ribs slightly granulated; the sutures distinct, impressed, the lower part of the last whorl nearly smooth, the umbilicus white, smooth inside, the edge furnished with a series of granules. The mouth subquadrangular, outer lip crenulated at the edge, the columella lip smooth, with a large tooth at the inside, and a little roughness on the outer side; axis three-tenths, diameter five-twelfths of an inch. 31. Monodonta constricta, Lam. Hist. 7 36. 32. Monodonta rudis (n.s.) Testa ovato-conica imperforata ulbido-purpurea rudis crassa, labro duplicato, extus albido viridi, intus subsulcato, albo. Inhab. -- Mus. Brit.