TRIBE CONCHACEA. 107 
date, thick, posteriorly shorter, concentrically sub-striated, white, 
with the grouped linear rays and the sa abet slope tawny-ches- 
nut : no lunule: inside uniform white. 13.—South Seas. 
C. Damaoipes.—VeENnvus D. Gey i in W. 8. Ff: 17. Sub- 
triangular, convex, thickish ; anteriorly rather shorter and obtusely 
angulated at the ventral edge; posteriorly broader and rounded ; 
ventral edge very convex; under a pale drab epidermis, white, 
with rather broad tawny-chesnut rays: lunule indistinct, lanceo- 
late: inside uniform white, in one valve three cardinal and a sub- 
lateral tooth, two cardinal in the other. 14.—. Indies. 
**k Inner margin crenulated or toothed. 
C. Pectinata. Lam. 63.—Venvus P. Lin. 1135.—W. t. 8. 
J. 99.—V. Discors. D.p. 199.—Bl. t. 74. f. 4.—#. t. 271. f. 
1.—List. t. 312. f. 148.—Ch. f. 418. Ovate, mottled with white 
solid, heavy : smooth, covered with a pale yellowish periostraca ; 
umbones and extremities concentrically grooved: disc opaque 
white : hinge margin very thick ; posterior tooth rudimentary ; 
lunule deep, short. Like Concentrica, but heavier, larger, and 
less grooved. 
A. Tumipa. Gray. Sub-orbicular, convex, solid, rather pel- 
lucid, white, with close fine regular concentric ridges, the alternate 
ones becoming somewhat broader on the anterior side : lunule short, 
cordate ; anterior slope rather short, sightly curved. 
A. Brueuiert. Gray.—lL. t. 277. f. 1. Sub-orbicular, com- 
pressed, thin, white, with rather close concentric ridges, the alter- 
nate ones ending before they reach the anterior slope, the front and 
hinder ends of the larger ones laminar, and forming teeth-like 
processes on the edge of the anterior slope: lunule small, cordate. 
A. Bitununtata. Gray. Sub-orbicular, compressed, pale 
whitish, with obscure brown rays and close regular concentric 
ridges, which are slightly elevated at each end, and form a series of 
small teeth on the edge of the anterior slope, and others on the 
edge of a large lanceolate lunule-like smooth space surrounding the 
small and cordate lunule. 
A. Arricana. Gray. Orbicular, rather convex, thin, brownish- 
white, rather pellucid, with regular close very fine concentric grooves: 
lunule short and cordate; inside brownish or pale rose-coloured, 
jeweled el ay as y. Thinner, nearly smooth, striz very fine. 
~o-—Senegal, Sc. 
Those who may adopt Artemis as a genus, and not merely as a 
section of Cytherea, must add to these the C. Excisa, Concentrica, 
Exoleta, Linota, Lunaris, Histrio, Juvenilis, Prostrata, &c., of our 
catalogue. 
