TRIBE CONCHACEA. 107 



date, thick, posteriorly shorter, concentrically sub-striated, white, 

 with the grouped linear rays and the anterior slope tawny-clies- 

 nut : no lunule : inside uniform white. 1|. — South Seas. 



C. Damaoides. — Venus D. Gray in W. S. f. 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. 1^, — ^. Indies. 



** Inner marrjin creniilated or toothed. 



C. Pectinata. Zam. 63.— Venus p. Lin. 1135.— TF. t. 8. 



/. 90.— V. DiscoRs. D. p. 199.— Bl. t. 74. f. 4.—JS. t. 271./. 



I.— List. t. 312./. 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. — Xi^e Concentrica, but heavier, larger, and 

 less grooved. 



A. TuMiDA. 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, slightly curved. 



A. Bruguieri. Gray. — U. 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. BiLUNULATA. 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. Africana. 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, 

 polished. — Variety. Thinner, neai"ly smooth, striae very fine. 

 -fg. — Senegal, (^-c. 



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. 



