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Show 120 MR. SOWERBY, JUN., ON NEW SPECIES OF SHELLS. [Jan. 17, 6, sloping, scarcely convex ; nucleus smooth ; last whorl somewhat swollen, contracted towards the base. Aperture oblong, dark brown within. Lip with a moderate sinus above, denticulated within. Canal very short. Columella with a nodulous callosity above. Length 4, width 2 millim. Hab. Florida, on Ostrea virginica (Melvill). Mr. Melvill found specimens of this shell as noted above in 1872, and in 1879 gave the species the above name in manuscript in his collection; but the shell has not I believe been hitherto described. It is allied to C. nigricans, but smaller and quite different. FISSURELLA MELVILLI, sp. nov. (Plate V. fig. 11.) Shell oval, rather elevated, broad behind, slightly contracted in front; radiately closely ribbed, ribs very little raised, alternately larger; concentrically wrinkled; pale green, interior greyish white. Orifice round, subcentral. Margin slightly irregularly wrinkled. Length 50, width 40, height 22 millim. Differing from its congeners chiefly in the rotundity of its orifice. PECTEN SIBYLL^E, sp. nov. (Plate V. fig. 12.) Shell thin, suborbicular, acutely elevated at the umbones, equilateral, equivalve. Colour light orange, concentrically faintly banded with darker orange. Upper valve slightly convex, lower somewhat flatter ; both valves very finely and closely ribbed, ribs very delicately serrated. Right auricle narrow, extending to about a quarter of the length of the shell from umbo to margin; left auricle moderately broad. Alt. 58, lat. 56 millim. A very beautiful species with delicate sculpture ; the ribs are very numerous and close-set, varying slightly and promiscuously in size, not regularly alternating as in some species. The delicate close-set scales cover the whole of the ribs. The specimen passed from the collection of the late Thomas Lombe Taylor into that of Mr. Melvill, who gave it the above name in manuscript. PECTEN LOXOIDES, sp. nov. (Plate V. fig. 13.) Shell rather thin, obliquely subovate, inequilateral, white, with the upper valve transversely undulately streaked, and spotted with pinkish orange. Lower valve rather deep, upper slightly convex. Radiating ribs 20 in number, prominent, rounded, smooth ; interstices about equal in width to the ribs, also smooth. Auricles small, the right rather larger than the left. Alt. 25, lat. 24 millim. Hab. Australia. The valves of the specimen are odd; there are also odd valves of the same species in the British Museum. The species is quite unlike any hitherto described, and may be easily recognized by the obliquity of its outline. CONUS TEXTILE, var. EUETRIOS. (Plate V. fig. 6.) Compared with C. canonicus (Brug.), more pyriform and atten- |