60 TESTACEOUS MOLLUSCA. 



smooth, pellucid, glossy, white with pink short broken zigzag lines ; 

 hinge with a single tooth. ^. , l^. — Guinea. 



P. Pacifica. Conr. Jour. A.N.S. Phil. 7. p. 241. t. 18./. 13. 

 Sub-oval, convex, anteriorly rather shorter, margin direct and slightly 

 arcuated; generally purple, with darker zones and two pale anterior 

 rays, (sometimes white, pink, flesh or yellowish with purple rays,) 

 with very obscure radiating lines. ^.—U. California.^ 



PSAMMOT.EA. 



Transverse, ovate, or oblong-ovate ; slightly gaping at the sides ; 



a single primary tooth in each valve, (sometimes in one valve 



only;) ivithovt the irregular plait oj" the Tellijice. 



P. Violacea, Lam. 1. — Bl. t. 78./. 2. Ovate-oblong, trans- 

 versely striated, rather ventricose, violet with or without paler or 

 even white rays. ]^. — New Holland. Variety, ■with purple rays 

 on a white ground (P. Serotina. Lam, 5. — P. Viol. Sow. G.f, 

 2.— Reeve, t. 53./. 2.)—E. Indies. 



P. Zonalis. Lam, 2. — Del. t. 5. /. 9. Ovate oblong, sub- 

 equilateral, ventrally but little rounded, anteriorly sub-angulated, 

 posteriorly rounded, compressed, yellowish with indistinct livid bands 

 and rays, with striae of growth and anastomosing vertical lines. \^. 



P. Pellucida. Lam. 4. — Del. t. 5. /. 10. Oval-oblong, de- 

 pressed thin whitish, pellucid ; the anterior side lanceolate, folded 

 and sub angulated : hinge with two teeth in one valve and none in 

 the other. \^. 



P. Candida. Lam. 6. — Grif. Cuv. t. 12./. 10. Oval-oblong, 

 thin, pellucid ; with some radiating longitudinal and very fine trans- 

 verse strise ; the anterior side very short and angular ; the cardinal 

 tooth of each valve cleft. 2, — New Holland. 



P. Tarentina. La,m. 7. — Del. t. 5. /. 11, Roundish-ovate, 

 sub-depressed, rounded and shorter on the posterior side, whitish, 

 decussated by fine arched transverse and extremely fine vertical striae : 

 beaks yellow. 1. — Mediterranean. — Much reseinbling Tellina 

 Solidula. 



P. DoNAciNA. Lam. 8, — Del. t. 5./. 12. Ovate, sub-depressed, 

 anteriorly narrower shorter and sub-angulated, whitish with distant 

 purplish red rays and elegant fine transverse striae : inside rich 

 yellow. ^. — Europe? 



P. Rosea.— SoLEN R.—Gmel. 3227.— D. p. 66.— Ch.f. 55.— 

 TV. t. 3./. 23. Oblong-elliptical, anteriorly longer, twice as broad 

 as long, under a green epidermis pink flesh colour within and with- 

 out, smooth, rounded at both ends, ventral edge nearly straight ; 

 hinge with a somewhat bifid tooth inserted into a cavity in the 

 opposite valve. 2. — Red Sea. 



1 See too the P. Laskeyi of Turton, (Tellina L. 3Iont. t. 28. 

 /. 3. — W. t. 4./. 65.), which we have copied. 



