370 TESTACEOUS MOLLUSCA. 



glossy white (except occasionally a minute purple line in front of 

 the beaks), smooth upon the umbones, elsewhere with regular con- 

 centric lyriform wrinkles ; ligamental edge scarcely, if at all, sloping, 

 subparallel with the somewhat convex ventral one, which is rounded 

 at both extremities ; umbonal slope excavated, denned by an angle 

 behind, and by a second one in front near the subterminal beaks ; no 

 lunule. 1$...2£. Africa? 



Cypricardia decussata (t. 18, f. 30), Reeve, Z. P. 1843, p. 195 ; 

 I. Cyp. f. 6. Elongated-oblong, extremely inequilateral, rather 

 thin, ventricose, white, closely radiated with extremely numerous 

 scarcely raised striae, which are obsolete behind, and in front decus- 

 sately reticulated near the ventral edge ; ligamental edge convex, 

 subparallel with the ventral; anterior extremity bluntly rounded; 

 posterior extremity contracted, rounded ; umbones a little flattened ; 

 no distinct lunule. {-...&. 



Cypricardia Solenoides (t. 18, f. 31), Reeve, Z. P. 1843, p. 196 ; 

 I. Cyp.f. 11. Transversely elongated, very inequilateral, moderately 

 strong, at most sub ventricose, rather compressed behind the um- 

 bones, white with vestiges of livid or reddish brown linear rays, 

 smooth or with close concentric wrinkles ; ventral and ligamental 

 edges subparallel ; front extremity abruptly rounded ; hinder termi- 

 nation narrowed and rounded ; umbones livid purple ; no lunule ; 

 inside white, usually purple-tinted in front. f...2. Lord Hood's 

 Island. Seems a variety of C. vellicata. 



Cypricardia laminata (t. 18, f. 32), Reeve, Z. P. 1843, p. 196; 

 1. Cyp. f. 9. Ovate-oblong, dilated and convexly subtruncated in 

 front, narrow and rounded behind, extremely inequilateral, thin, 

 compressed, wholly white, when young partially radiated with raised 

 striolae, when mature with about three erect remote concentric 

 lamellae on the anterior side towards the subarcuated ventral margin, 

 otherwise smooth or nearly so; ligamental edge straight, subhori- 

 zontal; no distinct lunule: lateral tooth very small, -g-.-.lf- Lord 

 Hood's Island. 



ISOCARDIA VULGARIS (t. 18, f. 33). I. MoLTKrANA, Sow. (llOt 



Chama M. Ck.) G.— Reeve, C. S. t. 78,/. 3.— I. v. Reeve, I. Is.f. 2. 

 Transversely subcordate, rather thin, tumid, pale ochraceous, cream- 

 coloured, or flesh-coloured, not variegated, shining, ridged throughout 

 with very numerous subimbricated concentric lyrae, which disappear 

 upon the subretuse anterior slope ; ventral edge much arcuated pos- 

 teriorly, incurved behind the blunt yet very prominent umbonal 

 ridge; anterior extremity subbiangulated, the edge convex. l...l£. 

 China. 



Isocardia Lamarckii (t. 18, f. 34). — C. Moltkiana, Brug. (not 

 Chama M. Ch.), p. 405.— I. M. E. t. 233,/. ].— T. L. Reeve, I Is. 



