i»ART II. MACROTRACHIA. VENERINiE. 37^ 



CvTHEREA Lam. Animal with the siphons entirely 

 united ; foot large, tongue-shaped ; shell generally 

 smooth and glossy ; cardinal teeth 4 ; lateral tooth \, 

 placed on the anterior side. (^ Jig .'19,0. d, y.) 

 C. Chione. Poll. ii. pi. 20. f. 1 . niaculata. 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, (^jig. 120. A.) 



D. scorotum. En. Meth. 260. f. 2. 



Capsa Lam. Shell transverse, nearly equilateral ; car- 

 dinal teeth -^ ; lateral teeth ^ ; ligament external. 

 C. Braziliensis. Sow. Gen. f. 1. {fig. 120./".) 



Cardissa Sw. Shell 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 ; umbones prominent; cardinal teeth -| ; 

 lateral teeth ^, remote. 



Cardium Linn. Shell ventricose, equilateral ; cordate, with 

 costated ribs ; often armed with spines. Typical. 



costatuni. Wood, General Conch, edula. Wood, Conch. 



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



tuberculatum, Sow. G. f. 3- 



Lcevicardium Sw. Shell longitudinally oval, inequila- 

 teral, the surface neither ribbed nor spired. Sub- 

 typical. 



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



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



citrinum. lb. 54. f. 3. ^olicum. lb. 51. f. 1. 



Hemicardium Sw. Half heart-shaped ; the anterior side 

 abruptly truncated, and very short : representing 

 Donux, &c. 



H. unedo. Wood, Conch, pi. fragrum. Wood, Conch, pi. 

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



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



B B 3 



