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 lamellse, 



Venus, sp., jun. 



Hub. Station 2. 



Another apparently young form, a little broader than the prece- 

 ding, without the radiating strise, and more inequilateral. Both are 

 white. 



Chione gayi, Hupe. 



Venus gayi, Hupe, Gay's Ilistoria 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 creuulated all round the margin, except on the ligamentai 

 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 16g, 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 consider- 

 ably 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 

 TAmerique meridionale,' vol. v. p. 563, under the name of V. 

 ctimingii. Having compared them with the type of modesfa, 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 ligamentai 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. 1-Ic.) 



Shell thin, white, transverse, rounded anteriorly, and curvedly 

 truncate behhid, 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 hnes of growth are to be seen ; near the posterior end there 

 is a slightly depressed portion of the valves. Umbones prominent. 



