S50 = TESTACKOUS MOLLUSGA. 
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, defined by an angle 
behind, and by a second one in front near the subterminal beaks ; no 
lunule. 13...23. 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 strie, 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. ...2. 
CyPRICARDIA SOLENOIDES (t. 18, f. 31), Reeve, Z. P. 1843, p. 196 ; 
I. Cyp. f.11. Transversely elongated, very inequilateral, moderately 
strong, at most subventricose, 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. 3...2. Lord Hood’s 
Island. Seems a variety of C. vellicata. 
CYPRICARDIA LAMINATA (t. 18, f. 32), Reeve, Z. P. 1843, p. 196; 
J. 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 
striole, when mature with about three erect remote concentric 
lamelle 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. 3...12. Lord 
Hood’s Island. 
IsocaRDIA yuLeaRrts (t. 18, f. 33).— I. Monrgiana, Sow. (not 
Cuama M. Ch.) G.—Reeve, C. S. t. 78, f. 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 lyre, 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. 1...15. 
China. 
Tsocarpra Lamarckit (t. 18, f. 84)—C. Morrgkiana, Brug. (not 
Cuama M. Ch.), p. 405.—1. M. E, t. 233, f. 1.—I. L. Reeve, I. Is. 
