96 TESTACEOUS MOLLUSCA. 



and approximate at their base, and one isolated and situated 

 under the lunule ; three primary divergent teeth in the opposite 

 valve, and a rather distant hollow parallel to the margin. 



* Inner margin quite entire. 

 Section A. — Anterior tooth or its receptacle striated. 



C. Lusoria. Lam. 1.— Venus L. D. p. \77*—Ch. f.MO. — 

 E. t. 270. / \.—W. t. 7. f. 43. Ovate, heart-shaped,' smooth, 

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

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



C. Petechials. Lam. 2.—E. t. 268. /. 5, 6.— Sow. G. 

 — Reeve, t. 69. 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 Ocean. 



C. Impudica. Lam. Z.—Ch.f. 347, 8. and 350.— JE*. t. 269. 

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

 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. 1 



C. Castanea. Lam.4.— Ch.f. 351.— E. t. 269./. 2. Venus 

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

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

 angulated. 2 J — Indian Seas. 



C. Meretrix. Lam. 6. — Del. t. S.f. 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. 5. 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. %.— Ch. f. 358.— E. t. 266. ./. 3.* 

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

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

 Indian Ocean and N. Holland. — Perhaps a variety of the las t. Q 



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



1 We have given a copy of the V. Exilis of Chemnitz,/*. 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. 



