148 TESTACEOUS MOLLUSCA. 



other, with eighteen imbricated and scaly ribs ; within with a 

 brown or violet spot anteriorly or covering the surface, the lateral 

 tooth rather acute. 1^. — Mediterranean ? 



C. Concamerata. Lam. 19. — Chama C. Lin. 3304. — D. p. 

 219.— Ch.f. 506.— E. t. 234. /. 6.— W. t. 9.f. 15. Ovate oblong, 

 whitish within and without, with longitudinal ribs which are trans- 

 versely striated and somewhat crenated ; the inner margin con- 

 tracted and appearing as if doubled over in the middle so as to form 

 an opposite ovate chamber in each valve. \ . . 4. — W. Indies. 



C. Aviculina. Lam. 20.— Del. t. 11./. 10. Ovate oblong, 

 with (in the largest specimens) orange spots on the ribs ; the longi- 

 tudinal ribs armed with imbricated scales which become arched and 

 semi-erect as they recede from the beaks ; inside white. 1. — New 

 Holland. — (Very close to, and possibly a variety of, Lamarck's 

 Calyculata.) 



C. Citrina. Lam. 21. Oblong spatulate, citron yellow, the 

 longitudinal ribs crowded with imbricated scales which are more 

 erect towards the margin and at the posterior extremity ; white 

 within. ±. — New Holland. — (Probably a young Crassicosta. 

 Desh.) 1 



C. Subl^svigata. Lam. 22. Oval oblong, with white and 

 rufous zones and irregular rays, with very delicate transverse strise 

 and the margin quite entire, f. — (In shape and hinge resembling 

 a Cypricardia. — Desh.) 



C. Corbularis. Lam. 23. Oval, somewhat trapeziform, thin, 

 smooth, posterior side very short ; margin quite entire. %. — On 

 Corallines. 



C. Lithophagella. Lam. 24. — Del. t. 11. / 11. Oblong, 

 cylindraceous, thin, compressed towards the margin, anteriorly 

 dilated and obtusely truncated, ventral and ligamental edges sub- 

 parallel and straightish, whitish with the beaks fulvous, very 

 delicately striated transversely : the angle oblique and obtuse, 

 f. — Europe? — Having the aspect but not the hinge of Cypri- 

 cardia Coralliophaga, 



C. Radiata. Sow. Z. P. \832.— Reeve. Ic. t. l.f. 5. Oblong, 

 palish, variegated with fuscous spots and bands ; the posterior side 



1 I have not seen this species, but from its description, it seems 

 allied to, if not identical with, the C. Squamosa. Sow. Tank. Cat. 

 —An. E. t. 234. / 3. Oblong, variable in colour being white 

 orange-red, &c, but never spotted, armed with sixteen scaly radiat- 

 ing ribs ; the scales semi-erect and much more crowded on the 

 narrower and closer posterior ribs ; ventral edge but slightly waved, 

 not sinuated. -f . . 1|. — Senegal. — See my note on Crassicosta of 

 which species this is possibly a variety. 



