TRIBE CONCIIACEA. 105 



C. Vulnerata. JBrod. Z. P. 1835. Sub-globular, with very 

 numerous smooth concentric lines, whitish, with here and there 

 purple-red narrow bands ; lunule and anterior area blackish-purple, 

 ventral margin red, sub crenulated within ; epidermis brownish ; 

 inside white suffused with pink. If . . 1J-. — C. America. 



C. Pannosa. Sow. Z. P. 1835. Obovate, thickish, smooth, 

 whitish, obscurely painted with lurid spots, streaks, or angular 

 lines: apices rather prominent, -f^ . .\-^q.~~ Chili. 



C. Unicolor. Sow. Z. P. 1835. Ovate, sub-cordiform, 

 thickish, brownish, smooth and polished, but the sides concentri- 

 cally grooved ; anterior side the longer, sub-acuminated towards 

 the ventral edge, which is smooth ; purplish within. — Variety. 

 Larger and whitish. 1 t 3 q . . 1 t 6 q. — C. America. 



C. Argentina. Sorv. Z. P. 1835. Sub triangular, white, 

 smooth, sub-equilateral, posterior side rather shorter, anterior sub- 

 acuminated ; anterior dorsal edge straightish, sloping ; ventral 

 margin rounded : epidermis thin, silvery-white, horny, velvety 

 without. 2-^q . . 2^. — C. America. 



C Convexa. Say, Journ. A. N. S. Phil. 4. t. 12. /. 3.— 

 Gould Mas. p. 84. /. 49.— List t. 273. /. 109- ? Oval, sub- 

 cordate, inequilateral, thinnish, chalky-white, very convex, rounded 

 at the sides, marked with coarse lines of growth : ligament long 

 and somewhat sunken : beaks prominent and recurved ; lunule 

 distinct, cordate: inside polished, milk-white. 1J..]|. — JV. 

 America. 



C. Prora. Com. Journ. A. N. S. Phil. 7. p. 253. t. 19. /. 

 18. Inflated, polished, white, ovate-subcordate ; posterior side 

 short, sub-cuneiform, and sharply angulated at the extremity, which 

 is much elevated, its dorsal edge straight or slightly concave • 

 ventral edge well rounded ; lunule very slightly impressed, bounded 

 by a broad indistinct carina. If. —Pacific. 



C. Floridella. — Chione F. Gray in Analyst. 1 838. Ovate- 

 sub-cuneiform, depressed, much produced and attenuated anteriorly, 

 the ligamental edge sloping in almost a straight line to the anterior 

 extremity : posteriorly short and rounded ; ventral edge arcuated : 

 smooth (except on the anterior slope, which is concentrically 

 grooved,) polished, buff or drab, with more or less numerous and 

 distinct lighter rays interrupted by dark angulated or dotted 

 markings : lunule lanceolate ; inside orange, margin entire ; anterior 

 tooth rudimentary. j . . 1^. — Senegal. 



C Planulata. Prod, and Sow. Z. J. 5. p. 48. — Beechey. 

 Zool. t. 43. /. 6.— Reeve, t. 69. f. 2.— Sow. G.f. 2. Triangular, 

 rather depressed, sub-equilateral, the base and lower angles rounded, 

 pale yellowish, with many diverging fuscous rays : inside white 

 varied with brownish violet, anterior tooth so remote as almost to 

 appear a lateral one. — Variety. More equilateral, rather more 



