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. +..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. 22.—Java. 
S. Carinzus. Lam. 14.—S. Guinensis. D. p. 62.1—E. t. 
225. f. |.—Lis. t. 421. f. 265.— W. t.3.f. 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. 3..2.—New York. 
S. Consrrictus. Lam 15. Oblong, nearly straight, rounded 
at the ends, and rather smooth ; thin, white, and peculiar for the 
stricture in the middle.— China 5 Japan. 
S. Coarcratus.* G mel. 3227.—D.p. 64.—Lam. 17.—S. An- 
riauatus. Lam. 15.—Mont.p.52.—Ch.f. 45.—W. t. 3. f. 10. 
S. Cenrrauis. Say (fide Jay). Psammosia A. Turt. B. p. 
91. S. Cunrettus. Pen. 4. t.46.f.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, Sc. 
S. Srriematus. Lin. 1115.—D. p. 64.—Lam. 18.—Ch. f. 
41,2.—W.t. 3. f. 12.—E. t. 224. f.3.—Reeve. t. 26. f. 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 strize besides the lines 
of growth. 1..2.—Mediterranean J Atlantic. 
S. Rapiatus. Lin. 1114.—D. p. 63.—Lam. 19.— Ch. f. 389. 
—Sist. t, 422. f. 266.—W. t. 3. f. 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. 25.— Sumatra. 
An. var.?. SoLtecurtus Lucripus. Conr. Jour. A. N. S. 
Phil. 7. With two white rays.— U. States. 
S. Porirus. Wood. S.t. 1. f.6. Oblong, thin, rounded at 
both ends, ventral edge rather arcuated, ligamental tumid ; pos- 
teriorly shorter and narrower, the beaks being placed at 3ths 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 
