96 TESTACEOUS MOLLUSCA. 



and approximate at their base, and one isolated and situated 

 under the litnule ; tltree jrrimary divergent teeth in the opposite 

 valve, and a rather distant hollow p)^i'i'O.Uel to the margin. 



* Inner margin quite entire. 

 Section A. — Anterior tooth or its receptacle striated. 



C. LusoRiA. ia?«. 1.— Venus L. 2>. p. 1/7.— C/t. /, 340. — 

 E. t. 270. / \.—W. t. 7. f. 43. Ovate, heart-shaped," smooth, 

 white, with chesnut zones, which are interrupted in the middle : 

 anterior tooth channelled and striated. 2\. — China and .Japan. 



C. Petechialis. Lam. 2.—E. t. 268. /. 5, Q.—Som. G. 

 — Reeve, t. G9. f- 1. and t. 70. f. 1. Sub-cordate, obovate, tu- 

 mid, smooth, greyish, with dark tawny scattered dots under a 

 fulvous epidermis : anterior side angulated and its slope slate- 

 coloured : lunule obsolete : inside white with only a purple stain on 

 the nymphse. 2\ — Indian Oceaii. 



C. Impudica. Lam. 3.—Ch.f. 347, 8. and 350.—^. t. 269. 

 f. 1 . Rounded, heart-shaped, smooth, thick, inflated, pale salmon- 

 coloured, with the anterior slope (whose angle is very obtuse) and 

 the obsolete rays and bands of pale livid violet : inside white with 

 a purple stain at the anterior end. 2^. — Indian Ocean.^ 



C. Castanea. Lam.A.— Ch.f.2>o\.—E.t.2Q9.f.2. Venus 

 Meretrix. W. t. 7 . f. 47. Heart-shaped, smooth, thick, ches- 

 nut brown, the anterior slope bluish black : anterior side obtusely 

 angidated. 2|. — Indian Seas. 



C. Meretrix. Lam. 6. — Del. t. 8./. 1. Triangular, smooth, 

 white, but bluish olive on the slope of the angulated anterior side ; 

 umbones spotted. 2^. — India? 



C. Graphica. Lam. 7- — E.t.266.f.!). Rounded, triangular, 

 smooth, grey, with brown rays or flexuous lineoles ; anterior slope 

 oval and bluish ash-coloured : lunule oblong : sometimes rayless, 

 sometimes with two imperfect rays : anterior slope slightly elevated 

 in the middle. 1^. — Indian Seas. 



C. Morphina. Lam. 8.—Ch. f. 358.— E. t. 266. /. 3.* 

 Rounded, triangular, smooth, grey, (sometimes with two imperfect 

 brown rays), anterior slope bluish brown : lunule ovate. 1^ — 

 Indian Ocean ayid N. Holland. — Perhaps a variety of the las t.^ 



C. Zonaria. Lam. 5 — Arg. t. 21. F. Triangular, smooth, 



1 We have given a copy of the V. Exilis of Chemnitz, y. 363. 

 (Z>. p. 182. — W. t. 7 .f. 53.) which may probably prove the young 

 of this or Morphina. 



2 Quoted likewise for Venus Opima by Lamarc. I do not know 

 the species. 



