52 TESTACEOUS MOLLUSCA. 



angularly ovate, oblique ; with transverse erect and reflected 

 lamellae : interstices very finely striated : two teeth in one valve 

 and one in the other. ^. — Mediterranean. 



P. OcHROLEUCA.* Lam. 2. — Tellina Fragilis. im. 1117. — 

 B.p. 7S.—Ch.f. SA.—Payr. t. \. f. 9, \0.—Wood. sup. Tel. 

 f. 6. Thin, irregularly ovate, yellowish white, with rather distant 

 transverse strife and finer vertical ones in the interstices ; two 

 teeth in one valve and a heart-shaped one in the other. — Mediter- 

 ranean and JEuropean Seas. 



P. Semilamellata. Lam, 3. — Del. t.A.f. 10. Small, semi- 

 transparent, thin, white, triangularly ovate, anteriorly rather 

 flexuous, with rather distant transverse grooves, the ixpper ones of 

 which are lamellar, interstices longitudinally striated ; two teeth in 

 one valve and on6 in the other. — Rochelle. 



P. LuciNALis. Lam. \. — Yenus Divergens. Gmel.22^9. — 

 n.j). \9\.— C/i.f. 1666, 7.—W. f. 8./. 73. Suborbicular, in- 

 flated, the ventral margin somewhat depressed, with transverse 

 arched and other intervening variously curved strise ; two teeth in 

 one valve and one in the other. — New Holland. 



P. Striata. Lam. b.— Del. t. A. f. 11. Triangularly ovate, 

 rounded at both ends, with close longitudinal grooves and a few 

 transverse stria3 ; anterior side compressed ; umbones prominent : 

 two teeth in one valve and a cleft one in the other. — Rochelle and 

 Corsica. 



P. Costellata. Lam. 6. — Del. t. A. f. 12. Inflated, trian- 

 gular, ovate, rounded at both ends, dirty white, with numerous 

 longitudinal waved subacute rib-like strise ; a large and two small 

 teeth in one valve. — Mediterranean. 



P. RoccELLARiA. Lam. 7'— Del. t. A.f. 13.— Poll. t. 7 .f- 14, 

 1.5? Triangularly ovate, radiatingly wrinkled by longitudinal 

 grooves, a few transverse stria? : hinge with two teeth in one valve 

 and an obsolete one in the other. — Rochelle and Mediterranean. 

 — Closely resembling Striata, hut not so elongated anteriorly . 



P. RuPEREi.LA. Lam. 9.—E. 3. p. 7A7.—Del. t. 4. /. 14. 

 Ovate-triangular, the posterior side inflated and smooth, the an- 

 terior longitudinally wrinkled ; two teeth in each valve, of which 

 one, at least, is bifid. — Rochelle. — Variety, with longitudinal 

 grooves. — Bayonne. — Very like Striata, but ventrally sinnated. 



P. Pholadiformis. Lam. 11. — Sow. G. f. 1, 2. — LJ. vol. 3. 

 p. 7A7. — Reeve, t. 51./. 1. — Gould, p. 53. — P. Fornicata. Say. 

 Transversely elongated, white ; the posterior side very short and 

 covered with toothed lamellar longitudinal grooves ; anteiior side 

 nearly smooth and slightly gaping ; ventral margin slightly in- 

 curved : valves with two cardinal teeth. 1^. — Rhode Island. 



P. Fabagella. Lam. 12. Oval, decussated by fine longi- 

 tudinal and transverse strise. — New Holland in Madrepores. 



