56 TESTACEOUS MOLLUSCA. 
ventricose, and beaks somewhat prominent; partially rayed, and 
spotted with red and white, and slightly striated concentrically : 
nymphe prominent. 21..2.—Z'ranquebar, Ceylon, and the 
Nicobar Isles. 
S. Rosea. Lam. 2.—Sow. G. f. 1.—Reeve. t. 52. fi 1.— 
SoLen Sancuinoutentus. Gimel. 3227.--D. p.67.—Ch. f. 56. 
—H. t. 227. f. 1.—W. t. 3. f. 28.  Sub-oval, rather convex, 
slightly produced and angulated at the anterior extremity, and 
rounded at the other; rose colour, becoming paler towards the 
margin, and nearly smooth. 11..2—West Indies.! 
S. Notrauiu. .Conr. Journ, A.N.S.2P hil. .230.»t. 1755f. 6: 
Sub-ovate, thin, much compressed; anterior margin obliquely 
truncated, extremity angular; ventral margin regularly arcuated, 
beaks small, slightly prominent, distant from the posterior 
margin ; ligament short and very prominent, nymphe very pro- 
minent ; whitish, with purple zones and rays, epidermis polished, 
and horn coloured, with paler spots and rays : teeth prominent, 
slender and fragile. 14..12.—U. California. 
S. Cauirorniana. Conr. Journ. A. N.S. Phil. 7. p. 231. 
t. 17. f. 7. Ovate, compressed, sub-equilateral, thin : fragile, dull, 
rosaceous, the anterior side much compressed, cuneiform. 
—U. California. 
S. Brraprata.—Soien. B. Wood, G. C.p.135. tab. 33. f. 1. 
—D. p.67.—W. t. 3. f. 26. Oval, sub-equilateral, rounded and 
gaping at both ends, livid purple, with two oblique white anterior 
rays; epidermis green: inside whitish, becoming pale orange by 
age, hinge with two teeth in each valve. 
9 1 
ip-e ld. 
PSAMMOBIA. 
Transverse, elliptical, or oblong-ovate, flattened, slightly gaping at 
one side; beaks prominent ; two primary teeth in the left valve, 
and onein the opposite one. 
P. Rucosa. Desh.—Saneuinotaria R. Lam. 4.—Venvus 
Dertorata. Lin. 1133.—W.t. 8. f. 64.—D. p. 186.—Mont. 
t. 3. f.4.—V. Versitcotor. Gmel. 3281.—-V. Purpurga. Gm. 
3289.—H. t. 231. f. 3.—Ch. f. 79 to 83.—Psammosia R. Sow. 
G. f. 1.—Reeve, t. 53. f. 1.  Ovate-oblong, ventricose, with 
strong longitudmal and fine transverse wrinkles, both becoming 
coarser at the anterior end which is generally more or less stained 
with purple: white, pale reddish, yellowish, or purple, and some- 
times rayed with the latter colour. 14..2—India and America. 
18. Lrvipa, Zam. 3. and Rugosa, Lam. 4. (having but a 
single tooth in one of the valves) belong to Psammobia. 
