28 TESTACEOUS MOLLUSCA. 



L. Crassiplica. Lam. 10. — An. variety. E. t. 255. /. 21 

 Rounded-ovate, thin, pellucid, white, convex, with tolerably large 

 and regular transverse plaits ; posterior side very short. 1^. — 

 Indian Ocean 7 . 



L. Complanata. Lam. 11. — Mactra C. Gmel. 3261. — W. 

 t. 6. /. 35.— M. Planata. D. p. 145.— E. t. 258./. A.— Ch.f. 

 238. Ovate-oblong, thin, finely striated and ridged transversely, 

 compressed, hinge margin nearly straight ; anterior lateral teeth 

 very distinct and simple in each valve. \\. — Indian Ocean. 



L. Cottardi. Payr. p. 28. t. \. f. 1, 2.— Phil p. 10. 

 Triangularly oval, compressed, pellucid, shining, sub-equilateral, 

 posterior side sub-angulated, anterior rounded ; white with fine 

 transverse strise, umbones acute and very small; ligamental pit 

 oblique and very small ; teeth obsolete. — Mediterranean. 



L. Vitrea. Gray.— Mactra V. D. p. 133. — Ch.f. 1959, 0.— 

 W. t. 6.f. 4. Ovate somewhat heart-shaped, very brittle, white, 

 diaphanous, transversely plaited ; anterior depression lanceolate, 

 posterior ovate oblong ; hinge much nearer the posterior end. 1 . . 1^. 

 — Coromandel and Ceylon. 



L. Squamosa. Gray.— Solen S. Mont. p. 565. — D. p. 70. 

 — Lepton S. Turt. Bio. p. 62. t. 6.f. 1, 2, 3. Flat, nearly 

 orbicular, equivalve, inequilateral, pellucid, thin, white, obscurely 

 wrinkled, concentrically punctured in a scale-like manner, beak 

 small and pointed. -j\..^.—Engla7id 3 rare. 1 



MACTRA. 



Transverse, inequilateral, subtrigonal, sides slightly gaping : beaks 

 prominent : one primary compressed V-shaped tooth in each 

 valve and an adjacent heart-shaped cavity ; two lateral com- 

 pressed teeth, situated near the hinge and inserted; ligament 

 internal and inserted in the pit of the hinge. 



M. Solidissima. Chem. f. 1656. — D. p. 140. — Goidd. Mas. 



List. t. 308. f. 141. Transversely oval -orbicular, very thin, white, 

 inflated, equally concentrically and regularly grooved, with very 

 faint parallel lines within the grooves, posteriorly short, sub-cunei- 

 form, compressed ; a marginal, longitudinal, irregular, sub-impressed 

 line, between which and the edge the grooves become mere wrinkles; 

 posterior dorsal edge straightish, the gape considerable; anteriorly 

 regularly curved, the slope convex. 2.. 2\. — U. States. 



1 Add C. Cyprinus. Gray. W. S. t. \.f. 1. See too L. Lin- 

 eata. Say. Am. C. t. 9. — L. (Cryptodon) Nuttalii. Conrad. 

 Jour. A. N. S. Phil. 7. t. 18./. 1 



