56 TESTACEOUS MOLLUSCA. 



veiitricose, and beaks somewhat prominent ; partially rayed, and 

 spotted with red and white, and slightly striated concentrically : 

 nymphae prominent, 2|. .2. — Tranquebar, Ceylon, and the 

 Nicohar Isles. 



S, Rosea. Lam. 2.— Sow. G. f. I. — Reeve, t. 52. f. 1.— 

 SoLEN Sanguinolentus. Gitiel. 3227. — D. p. 67. — Ch.f. 56. 

 —E. t. 227./. 1.— TF. t. 3. f. 28. Sub-oval, rather convex, 

 slightly produced and augulated at the anterior extremity, and 

 rounded at the other ; rose coloui', becoming paler towards the 

 margin, and nearly smooth. 1^..2 — West Indies.^ 



S. Nuttalii. Conr. Journ. A.N.S. Phil. 230. t. 17. / 6. 

 Sub-ovate, thin, much compressed ; anterior margin obhquely 

 truncated, extremity angular; ventral margin regularly arcuated, 

 beaks small, slightly prominent, distant from the posterior 

 margin ; ligament short and very prominent, nymphse very pro- 

 minent ; whitish, with purple zones and rays, epidermis polished, 

 and horn coloured, with paler spots and rays : teeth prominent, 

 slender and fragile. l-^..lf. — U. California. 



S. Californiana. Conr. Journ. A. N. S. Phil. 7. p. 231. 

 t. \7'f. 7. Ovate, compressed, sub- equilateral, thin : fragile, duU, 

 rosaceous, the anterior side much compressed, cuneiform. i^-'H' 

 — U. California. 



S. Biradiata.— SoLEN. B. Wood, G. C. p. 135. tab. 33./. ] . 

 — ly. p. 67. — W. t. 3. /. 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. 



PSAMMOBIA. 



Tran.%verse, elliptical, or oblong-ovate, flattened, slightly gaping at 

 one side; beahs prominent ; two primary teeth in the left valve, 

 and one in the opposite 07ie. 



P. RuGOSA. Desh. — Sanguinolaria R. Lam. 4. — Venus 



Deflorata. Lin. 1 133.— TF. ^ 8. /. 64.— Z>. p. 186 Mont. 



t. 3./. 4. — V. Versicolor. Gmel. 3281. — V. Purpurea. Gm. 

 3289.—^. t. 231. /. 3. — Ch.f. 79 to 83.— PsammobiaR. Sow. 

 G. f. 1. — Reeve, t. 53. /. 1. Ovate-oblong, ventricose, with 

 strong longitudinal and fine transverse wrinkles, both becoming 

 coarser at the anterior end which is gener.ally 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. 



^ S. LiviDA, Lam. 3. and Rugosa, Lam. 4. (having but a 

 single tooth in one of the valves) belong to Psammobia. 



