TRIBE CARDIACEA. 147 



C, RuFESCENs. Lavi. \4.—List. t. 34/. /. 185 ? Oblong, 

 posteriorly contracted and sinuous, reddish fulvous with seventeen 

 ribs armed with imbricated flattened scales ; margin waved. —6^e- 

 7teral appearance of last.) — Guljih of Nicoya. 



C. Variegata. Bruq. — Chama Calyculata. D. p. 217. — 

 List. t. 347. /. \^\.— Ch.f 500, 1.— TF. t. 9. /. 10.— Cardita 

 C. Lam. 15. — Sow. G. — Reeve, t. 89. f 2. Oblong, anteriorly 

 retuse, increasing in breadth towards the margin, white with brown 

 crescent spots and twenty or twenty-one ribs of which the 

 lateral ones are crenated, the central armed with arched imbricated 

 depressed scales ; white within with the margin plaited by the ex- 

 terior ribs. 2. — Atlantic Ocean.^ 



C. NoDULosA. Lam. 17.—E. t. 234. /. \.—Ch.f. 1999 to 

 2002? — Del. t. 11./. 8. Oblong trapeziform, gibbous, reddish 

 rufous with sixteen rounded ribs armed with nodose crenulations : 

 margin entire. 1^. — New Holland. — Chinese Variety. Mottled 

 with white and rufous. 



C. Calyculata. Britg. p. 408. (excluding his synonym, of 

 Adanson)—C ^i-avATA. Lam. \8. — Chama Calyculata. IJn. 

 1138.— ^n. Gual. t. 90. F?~Poli. 2. t. 23. f 7, 8, 9. Oblong, 

 whitish, posterior side with two sinuosities one deeper than the 



Lamarck, I know not, but as to their identity with the Squamosa of 

 Mr. Sowerby (in Tank. Cat.) there can be no doubt. They are of 

 an oblong shape with the ventral and dorsal edges almost parallel 

 and little curved. The ribs are in number sixteen, armed with 

 depressed scales, convex, and not broader than their interstices. 

 The lunule is minute and the inside pure white. The exterior under 

 a tawny epidermis is either dirty white or orange red. The state- 

 ment of Lamarck, that the ribs are but ten or twelve and that it is 

 contracted and sinuated posteriorly, would agree better with Mr. 

 Sowerby's Squamifera, which I will now describe. 



C. Squamifera. Sow. in Tank. Cat. Oblong, contracted 

 and sinuated posteriorly, expanded anteriorly ; uniform purplish 

 red or yellow, about twelve convex ribs armed with strong erect 

 scales, the three subanterior ribs infinitely the larger, interstices 

 rather broad : lunule minute : uniform whitish within, the margin 

 shghtly waved. 2. 



- C. SuBASPERA. Lam. IG. — Del. t. W.f. 9. — C. Variegata. 

 Bruy. no. 6. Oblong, gibbous, whitish, with twenty-three rufous 

 imbricated scaly ribs ; the scales arched semi-erect and subacute : 

 margin crenated. 1 1. — As Deshayes declares that the Varieyata of 

 Bruyiereis Lamarck's C. Calyculata, and the latter author founci-i 

 this species on the identical specimen which Bruyiere has described, 

 it is jyrobable that this species may be only a variety of the last. 



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