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Show 38 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, mature. They are of a rounded, somewhat triangular form, radiately finely striated, and with a few concentric raised lamellae. VENUS, sp., jun. Hab. Station 2. Another apparently young form, a little broader than the preceding, without the radiating striae, and more inequilateral. Both are white. CHIONE GAYI, Hupe. Venus gayi, Hupe, Gay's Historia de Chile, vol. viii. p. 337, Atlas, pi. 6. f. 5 a-c. Shell trigonally ovate, thickish, a little inequilateral, light brown, rather coarsely concentrically sulcate, and under the lens most minutely radiately striate. Valves moderately convex, white within, very finely crenulated all round the margin, except on the ligamental slope. Teeth in right valve three, central and posterior one bifid and subequal; in left valve three, central one bifid and the largest. Anterior muscular scar elongate, truncated at the upper end; posterior shorter, pyriform. Pallial sinus moderate. Lunule elongate-cordate, defined by deeply incised lines. Diam. 20 millims., length 161, thickness 10. Hab. Station 5 ; and Boija Bay, 20 fms., on a shelly and stony bottom. There are four specimens of this simple species, which is considerably like C. mesodesma of Quoy and Gaimard. In d'Orbigny's collection there are two specimens of this species marked, in his own handwriting, " V. modesta, Callao, Perou." These, no doubt, are those which he mentions in the ' Voyage dans TAme'rique meridionale,' vol. v. p. 563, under the name of V. cumingii. Having compared them with the type of modesta, Sowerby, for which he substitutes the preceding name, they prove to be totally distinct in form, colour, and sculpture. They exhibit one slight difference from those obtained by Dr. Coppinger. The lunule is brownish red, and on the ligamental slope there are a few irregular angular lines. CHIONE, sp., jun. Hab. Station 2. Only a single specimen is in the collection. It is of a transversely oval form, rather strongly concentrically sulcated, whitish, with a purplish stain posterior to the umbo, which is rather excentric. DIPLODONTA LAMELLATA, sp. n. (Plate V. figs. I-lc.) Shell thin, white, transverse, rounded anteriorly, and curvedly truncate behind, exhibiting an obtuse dorsal angle. Valves sculptured with concentric fine raised lamellae, which are by degrees further apart as they approach the margin; between these very feeble lines of growth are to be seen ; near the posterior end there is a slightly depressed portion of the valves. Umbones prominent, |