TRIBE MACTRACEA. 43 



striae ; hinge with a single erect tooth in each valve, and a 

 corresponding pit for its reception. J-..1. — England, §*c. 



A. Purpurascens. Lam. 14. Oval, thin, rather small, with 

 obsolete transverse striae, purplish white. — Cherbourg, 5 



A. Nucleola. Lam. 15. Minute, rounded, inequilateral, 

 convex, whitish tinged with scarlet. -J-. — Cherbourg. 6 



A. Physoides. Lam. 16. Orbicular-globose, hyaline, vesicu- 

 lar, size of a pea. — King George's Port J 



A. Decussatum. Gray. Ann. Phil. 25. — Tellina D. Wood 

 G. C. t. 43./. 2,3. — D. p. 97.— W. t. 2. /. 17. Sub-orbicular, 

 rounded at both but rather produced at one end, with very fine 

 decussated striae, white with the beaks rosy and the inside marked 

 with reddish, purplish, or brownish zigzag lines which do not extend 

 to the margin. 1 . . 1^. 



A. Solidum. Gray. Spic. Z. t. 6. /. 6. Thick, solid, sub- 

 orbicular, with concentric grooves, and delicate radiating striae, 

 anteriorly somewhat wrinkled; hinge margin purple ; lunule minute, 

 lanceolate : cardinal teeth very thin. 2J. — Peru. 



A. Cordiforme. Gray. Ann. Phil. 25. — Tellina C. D. 

 p. 97. — Ch. f. 1941, 2.— W. t. 4.f. 82. Sub-orbicular, whitish, 

 strong, convex, densely striated longitudinally, and finely trans- 

 versely : within stained with rich yellow, and the hinge cen- 

 tral. 1-J.Jf. 



5 Probably this is the Ervilia nitens.* Turt. Biv. t. 19. 

 f. 4. — Mya H. Mont. — D. p. 47. Oval, flattish, inequilateral, 



pinkish, finely striated transversely, rounded at both ends : a strong 

 erect cloven tooth in one valve, closing into a deep cleft between two 

 small laminar divergent elevations in the other. . . J; — England. 



6 Probably the Kellia Rubra.* Turt. Biv. t. 11./ 7, 8.— 

 Cardium R. Mont. t. 27. / 4.— D. p. 131— Tellina R. 

 Turt. D. — Bornia Seminulum. Philippi. p. 14. t. 1./ 16. 

 (fide Forbes.) Minute, oval, very inequilateral, rounded at the 

 sides, smooth or finely shagreened, reddish under a green or brown 

 epidermis : inside glossy purple ; hinge with two approximate car- 

 dinal teeth in one valve, a concave one in the other, a lateral tooth 

 in each. i. — England. 



t I should not be surprised, if in spite of the locality, this may 

 prove identical with the Kellia Stjborbicularis.* Turt. Biv. 

 t. 11./ 5. 6.— Mya S. Mont. t. 26. / 6.—D.p. 55.— TF. t. 3. 

 / 37. — Bornia Inflata. Philippi. p. 14. — An. Erycina 

 Geoffroyi. Payr. t. 1. /. 3, 4, 5. p. 30? Small, rounded oval, 

 very convex, yellowish white, nearly smooth, equilateral, rounded 

 on both sides, yellowish white : beaks prominent : teeth of K. 

 Rubra. ^ . . f . — England. 



