28 TESTACEOUS MOLLUSCA. 
L. Crasstpitica. Lam. 10.—An. variety. E. t. 255. f. 2? 
Rounded-ovate, thin, pellucid, white, convex, with tolerably large 
and regular transverse plaits; posterior side very short. 14.— 
Indian Ocean? 
L. Comeranata. Lam. 11.—Mactra C. Gmel. 3261.—W. 
t. 6. f. 35.—M. Puanara. DD. p. 145.—#. t. 258. f. 4.—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. 11.—Indian Ocean. 
L. Corrarpi. Payr. p. 28. t 1. f..1, 2.—Phil. p. 10. 
Triangularly oval, compressed, pellucid, shining, sub-equilateral, 
posterior side sub-angulated, anterior rounded; white with fine 
transverse strize, umbones acute and very small; ligamental pit 
oblique and very small ; teeth obsolete.— Mediterranean. 
L. Virrea. Gray.—Macrra V. D. p. 133.—Ch. f. 1959, 0.— 
W.t.6. 7.4. Ovate somewhat heart-shaped, very brittle, white, 
diaphanous, transversely plaited ; anterior depression lanceolate, 
posterior ovate oblong ; hinge much nearer the posterior end. 1..14. 
—Coromandel and Ceylon. 
L. Sauamosa. Gray.—Soiren 8. Mont. p. 565.—D. p. 70. 
-—Lrpron S. Turt. Biv. p. 62. ¢t. 6 f. 1, 2, 3. ) Flat, mearly 
orbicular, equivalve, inequilateral, pellucid, thin, white, obscurely 
wrinkled, concentrically punctured in a scale-like manner, beak 
small and pointed. 54,..,°,.—ngland, rare.) 
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. Souipissima. Chem. f. 1656.—D. p. 140.—Gould. 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..23.—U. States. 
1 Add C. Cyprinus. Gray. W.8S.t.1.f.1. See too L. Lin- 
EATA, Say. Am. C. t.9.—L. (Crypropon) Nurraui. Conrad. 
Hour ALN: S. hitb. Ao toe Voree 
