APPENDIX. -'Mil 



posteriorly, radiatingly costated ; ribs more or less arched, squami- 

 ferous, front ribs and their vaulted scales large, in adult examples 

 usually obsolete or worn down near the dorsal corner, hinder ribs 

 numerous (yet not crowded) and very narrow ; ligamental edge sub- 

 arcuated, rising ; lunule small, deep ; ligament sunken ; inside livid 

 brown in front, white behind ; anterior teeth large, lamelliform. 

 If-.. 2. Zanzibar, 



Cardita lacunosa (t. 18, f. 14), Reeve, Z. P. 1843, p. 193 ; 

 I. Card. f. 31. Peaked ovate, bluntly acuminated in front, rounded 

 behind, subventricose, not very inequilateral, not very solid, white, 

 stained anteriorly with brownish purple, rayed with about 21 ribs, 

 which are surmounted by a narrower crest-like ridge armed with 

 vaulted scales ; intervals profound, minutely wrinkled in a concentiic 

 direction ; ventral edge arcuated, rising at both ends ; umbones pro- 

 minent ; lunule small, ovate-cordiform. f . 



Cardita marmorea (t. 18, f. 18), Reeve, Z. P. 1843, p. 191 ; 

 I. Car./. 1 2. Oblong-subrhombic, extremely inequilateral, very solid, 

 ventricose, whitish, with a few chocolate-brown spots on the radiating 

 ribs, which are about 16 in number, rounded, deeply divided by nar- 

 rowed unsculptured intervals, nodosely crenated upon the posterior 

 half, smoothish (except when young) upon the anterior moiety ; liga- 

 mental edge scarcely, if at all, sloping, subparallel to the ventral ; 

 anterior extremity much rounded ; lunule small, profound, rounded- 

 heart-shaped ; beaks almost terminal ; inside wholly white, except 

 some purple-brown spots beneath the lunule and at the end of the 

 ligament. 1|-...2J. Australia. The inner front ribs are remarkably 

 broad ; there are no vaulted scales as in the allied C. Preissii. 



Cardita nitida (t. 18, f. 23), Reeve, Z. P. 1843, p. 192 ; I. Card, 

 f. 27. — ? C. arcinella, Val. Ven. Transversely oval, bluntly sub- 

 biangular and somewhat tapering in front, rounded behind, very 

 inequilateral, thick, ventricose, whitish spotted with brown upon the 

 radiating ribs, that are about 20 in number, moderately distant, 

 cover the whole surface, and are closely crenated ; the front ribs 

 narrower, their crense subnodulous ; the intervals square-cut, and 

 either smooth or obscurely lyrated ; ventral edge arcuated behind, 

 less so in front ; umbones prominent ; lunule inconspicuous in the 

 adult; inside whitish. ||...l£. Philippines. 



On Cypricardia (p. 149). Consult Reeve's monograph (Conch. 

 Icon.) : see, too, Mag. de Z. 1841, Proc. Bost. 1, 2, and D'Orbigny's 

 Cuba Shells. 



Cypricardia angulata, p. 149, t. 18, f. 27. 



Cypricardia obesa (t. 18, f. 29), Reeve, Z. P. 1843, p. 196 ; 

 7". Cyp. f. 10. Subrhombic, obliquely truncated in front, very in- 

 equilateral, solid, tumid, both within and without of an uniform 



2 a 



