28 TESTACEOUS MOLLUSCA. 



L. Crassiplica. Lam. 10. — An. varwty. E. t. 255. f. 2? 

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

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

 Indian Ocean 1 



L. Com PLAN ATA. Lavi.W. — Mactra C. Gmel. 2>2Q\.—W. 

 t. 6. /. 35.— M. Planata. B. p. 145.— jEJ. 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. Puyr. j). 28. t. 1. /. 1, 2.— Phil. p. 10. 

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

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

 transverse striae, umbones acute and very small ; ligamental pit 

 oblique and very small ; teeth obsolete. — Mediterranean. 



L. Vitrea. Gra^.— 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 j. 

 — Coromandel and Ceylon. 



L. Squamosa. (?/■«?/.— Solen S. Mont. p. 565. — D- p. 70. 

 —Lepton S. Turt. Blv. p. 62. t. 6./. 1, 2, 3. Flat, nearly 

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

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

 small and pointed. t:'|j..-i%. — England, rare^ 



MACTRA. 



Tratisverse, i?) equilateral, suhtrigonal, sides slightly (japing : beaks 

 pyroniinent : one primary compressed Y -shaped tooth in each 

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

 pressed teeth, situated ?iear the hinge and inserted ; ligament 

 internal and inserted in the pit of the hinge. 



M. SoLiDissiMA. Chem. f. 1656. — D. p. 140. — Gould. Mas. 



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

 inflated, equally concentrically and regularly grooved, with very 

 faint parallel lines v/ithin the grooves, posteriorly short, sub-cunei- 

 form, compressed ; a marginal, longitudinal, n-regular, 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..2g. — 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.\8.f.\ 



