PART II. MACROTRACHIA. VENERIN^E. 37S 



CvTHEREA Lam. Animal with the siphons entirely 

 united ; foot large, tongue-shaped ; shell generally 

 smooth and glossy ; cardinal teeth ^ ; lateral tooth i, 

 placed on the anterior side. (Jig.\l20. d, g.) 

 C. Chione. Poll. ii. pi. 20. f. 1 . maculata. En. Meth. 265. f. 4. 



DoNAx Linn. Shell cuneate, or wedge-shaped, the an- 

 terior side very short and truncate ; teeth variable in 

 the sub-genera, (^fig. 120. h.) 



D. scor^tum. En. Meth. 2fi0. f. 2. 



Capsa Lam. Shell transverse, nearly equilateraF; car- 

 dinal teeth ^ ; lateral teeth 1 ; ligament external. 

 C. Braziliensis. Sow. Gen. f. ]. {fig. 120./.) 



Cardissa Sw. SheU heart-shaped, excessively com- 

 pressed ; the anterior side truncate, and often concave ; 

 the posterior rounded. 



spinosa Sw. En. Meth. 293. f. 3. 



Cardium Linn. Shell ventricose, cordate, or longitudi- 

 nally oval j umbones prominent; cardinal teeth -| ; 

 lateral teeth |, remote. 



Cardium'Lum. Shell ventricose, equilateral j cordate, with 

 costated ribs ; often armed with spines. Typical, 

 costatum. Wood, General Conch, edula. Wood, Conch. 



i. pi. 56. f. 1. pi. 55. f. 4. 



tuberculatum, Sow. G. f. 3. 



LcBvicardium Sw. Shell longitudinally oval, inequila- 

 teral, the surface neither ribbed nor spired. Sub- 

 typical. 

 Europeum. Wood, Con. pi. flavum. Wood, pi. 54. f. 2. 



54. f. 1. oblongum. lb. 55. f. 1. 



citrinum. lb. 54. f. 3. ^olicuin. lb. 57. f. 1. 



Hemicardium Sw. Half heart-shaped ; the anterior side 

 abruptly truncated, and very short : representing 

 Donax, &c. 



H.unedo. W^ood, Conch, pi. fragrum. Wood, Conch, pi. 

 58. f. 3. 58. f. 1,2. 



retusum. lb. 58. f. 4, 5. lasvum Sw. lb. 57. f. 7, 8. 

 B B 3 



