14 TESTACEOUS MOLLUSCA. 



purplish with an obsolete white anterior ray : hinge with two teeth 

 in each valve, one of them nearly obsolete and very short. 4.. 3. 

 — S. America. 



S. Javanicus. Lam. 13. — Deles, t. 2. f. Linear, straight, 

 transversely narrow, yellow under a brown cuticle, rounded at the 

 extremities, ventral edge incurved in the middle ; in one valve two 

 teeth, in the other a single one : the middle bifid. 2J-. — Java. 



S. Caribous. Lam. 14. — S. Guinensis. D. p. 62.? — E. t. 

 225. /. 1.— Lis. t. 421. /. 265.— W. t. 3,/. 15. Elongated oblong, 

 straight, posteriorly oblique, rounded, anterior dorsal edge incurved ; 

 nearly smooth, ventricose, sub-pellucid, yellowish-white, the margin 

 near the hinge thickened ; hinge with two teeth in one valve, a 

 bifid one in the other, f . .2. — New York. 



S. Constrictus. Lam. 15. Oblong, nearly straight, rounded 

 at the ends, and rather smooth ; thin, white, and peculiar for the 

 stricture in the middle. — China $f Japan. 



S. Coarctatus.* Gmel. 3227.— D. p. 64.— Lam. 17.— S. An- 

 tiquatus. Lam. 15.— Mont. p. 52. — Ch.f. 45. — W. t. 3./. 10. 

 S. Centralis. Say (fide Jaji). Psammobia A. Turt. B. p. 

 91. S. Cultelltjs. Pen. 4. t. 46.jf. 25. Oblong, rounded at the 

 extremities, hinge margin slightly convex, ventral rather concave ; 

 white subpellucid, merely striated by the lines of growth which are 

 more conspicuous at the extremities : hinge with a single tooth in 

 one valve (at times the rudiments of a second) and two in the other, 

 behind which the margin is callous. 1 ..2. — Mediterranean , ( fc. 



S. Strigilatus. Lin. 1115. — D. p. 64. — Lam. 18. — Ch. f. 

 41, 2.— W. t. 3. /. 12.—E. t. 224. /. 3.— Reeve, t. 26. /. *4. 

 Oval- oblong, strong, very convex, and rather more rounded at one 

 end than the other, generally pink with two obsolete white rays ; 

 two -thirds of the shell covered with oblique striae besides the lines 

 of growth. 1 ..2. — Mediterranean fy Atlantic. 



S. Radiatus. Lin. 1114.— D. p. 63.— Lam. 19.— Ch.f. 389. 

 —List. t. 422. /. 266.— W. t. 3. /. 14. Oblong, smooth, thin, 

 brittle, straight, both within and without of a fine violet colour, 

 with four white longitudinal rays, which become broader as they 

 recede from the beaks ; epidermis green : hinge with two teeth in 

 each valve, and a strong white depressed rib extending somewhat 

 obliquely along the inside of the shell. 2\. — Sumatra. 



An. var. ? Solecurtus Lucidus. Conr. Jour. A. N. S. 

 Phil. 7. With two white rays. — U. States. 



S. Politus. Wood. S.t. l.f.6. Oblong, thin, rounded at 

 both ends, ventral edge rather arcuated, ligamental tumid ; pos- 

 teriorly shorter and narrower, the beaks being placed at f ths of 

 the whole breadth posteriorly, lilac or fawn colour with four rather 

 broad white rays : hinge strong and thickened, two emarginated 

 stout teeth in one valve, a concave erect one in the other, a very 



