98 TESTACEOUS MOLLUSCA. 
heavy, with coarse rather distant irregular grooves, which terminate 
so as to leave the anterior slope nearly glabrous, glossy, pale brownish 
fawn, becoming orange-chesnut at the margin, with somewhat in- 
terrupted dark brown rays which vary in ‘breadth and are often 
crowded ; lunule ovate; inside white. 2}..2%.—India.—Variety. 
White, with two bluish brown rays aad scattered angular mark- 
ings; the anterior slope unspotted.— New Holland.—Variety? 
Venus Pacrrica. D.p. 175.—Ch. f. 1976. Pale brown, with 
numerous violet brown rays, and the margin tinged with violet.— 
China. 
C. Linacina. Lam. 15.—Ch. f. 338, 9.—H. t. 264. fi 3 
Ovate, grooved closely, and indistinctly rayed, the margin and in- 
terior tinged with violet ; lunule livid. 21.— dZolluccas.—Not un- 
like Erycina, but proportionably broader. 
C. Impar. Lam. 16. Obliquely heart-shaped, whitish, with 
livid fulvous rays marked with grooves at the posterior end, which 
become indistinct as they recede ; anterior slope bluish grey ; ‘within 
white, with the anterior side empurpled. 24.— New Holland 
C. Pecroratis. Lam. 18. Ovate, depressed, transversely 
grooved, violet fulvous, with some very indistinct rays, and the 
lunule livid, with its edge as well as the suture beaks and anterior 
slope white with chesnut markings. 1.— Perhaps a young variety 
of Lilacina. 
C. Puanatetta. Lam. 19.—Ch. 7. t. 43. f. 6.2? Ovate, 
flattened, transversely grooved, white, with variously shaped fulvous 
spots, and a violet stain within ; lunule small, ovate, and fulvous. 1. 
C. Froripa. Lam. 20.—Del. t. 8. f. 7. Subcordate, trans- 
versely grooved, brownish with purple clouds and two or three 
crimson-brown rays; anterior slope marked with lines; lunule 
chesnut : violet red within. 14.— #lorida. 
C.Nitmuna. Lam.21.— Del. t. 8. f. 4. Ovate-elliptic, rather 
longer anteriorly, smooth, reddish fulvous, with about two chesnut 
spotted transverse belts ; beaks and interior whitish. +44. 
C. CHionr.* Lam. 22.—Venus Cutone. Lin. 1131.—D. 
p- 178.—Ch. f. 343.—W. t. 7. f. 44.—Bl. t. 74. f. 5.—Don. t. 
17. Ovate heart-shaped, glossy, smooth, fulvous with obsolete 
rays; lunule oblong acute and raised in the middle; cartilage 
cleft broad: epidermis tawny chesnut.— Zurope. 
C. Macuuata. Lam. 23.—Venus M. Lin. 1132.—D 
178.—Ch. f. 345.—List. t. 270. f. 106.—. t. 265. f. 4.—W. t 
7.f. 45. Ovate, somewhat heart-shaped, smooth and glossy, white 
more or less tinged with reddish brown, and marked with livid 
purple somewhat angular spots, some of the larger of which at 

1C. Erycinella (Zam. 17.) is a young Costata. 
