TRIBE CIIAMACEA. 227 



polished white, violet, or purplish red, margin crenated. If. Se- 

 negal. Lamarck quotes as a variety E. t. 196./. 2, the C Sessilis 

 of Wood. t.9.f. 21. 



C. Florida Lam. G.—List. t. 215. f. 50. (good)—C/i. f. 518 ? 

 Suborbicular, imbricated, mottled with white, yellow and rose 

 colour, with arched scales disposed in longitudinal rows ; margin 

 entire. St. Domingo. Not unlike Gryhoides. 



C. Limbula Lam. 7. Semiorbicular, obliquely fixed, scarcely 

 armed, the inner margin violet. New Holland. — Variety. The 



smaller valve gibbous. Isle of France "This shell especially when 



young is rather scaly beneath." The specimens from which this 

 description was taken, are much worn. 



C. iERUGiNOSA Lam 8. Suborbicular, reddish rufous, the larger 

 valve foliaceous near the beaks, the scales of the other valve minute 

 and arched : margin entire. Timor — li Very like Gryphoides" The 

 original specimens in the Museum of the Jardin des Plantes, have 

 the general appearance of the Lazarus of Lamarck. 



C. Asperella. Lam. 9. Imbricated, bristling with arched and 

 erect scales ; margin crenulated. — Variety With shorter and more 

 depressed scales. New Holland. 



C. Decussata. Lam. 10. Subglobose, squalid, with decussated 

 striae, of which the transverse ones become more prominent towards 

 the margin which is entire. — Size of a small plum. Indian Ocean. 



C. Arcinella Lin. 1139.— D. p. 224.— Lam. 11.— Ch.f. 522,3 

 —E. t. 197./. 4. — W. t. 9./ 25. Somewhat heart shaped, with 

 very spinous longitudinal ribs and the interstices marked with im- 

 pressed dots ; white, sometimes tinged with rose colour ; posterior 

 depression heart shaped ; margin crenulated and somewhat plaited. 

 Diam. \\. S. America. 



C. Radians Lam. 12.— Ch.f. 992.— E. L 196./. 3. C. Sinis- 

 trorsa. W.t. 9. /. 24. Rounded, thick, obliquely affixed, rayed 

 with white and rufous ; lamellae very short, crowded, depressed 

 and arranged in undulatingly transverse unbroken rows ; margin 

 entire : cardinal teeth very obtuse — E. Indies. 



C. Cristella Lam. 13.— List. t. 213. /. 48 /—Ch.f 993 ? Se- 

 miorbicular, involute, obliquely affixed, white spotted with orange, 

 with distant plait-like transverse scales ; margin crenulated. In- 

 dian Ocean. 



C. Albida 1 Lam. 14. Semiorbicular, yellowish white, glabrous 



1 From this species says M. Deshayes, Mr. Stutchbury has es- 

 tablished his genus 



CLEIDOTH^RUS. 



Jnequivalve, irregular, affixed, the single cardinal conical tooth of the 



q 2 



