TRIBE MACTRACEA, 31 
M. Supenicata. Lam. 17.—Ch. f. 205, 6. Triangular, thin 
white, somewhat plaited at the sides near the beaks, dise smooth ; 
hinge with a lateral bilobed tooth.—A large species intermediate 
between Carinata and Striatella, having its anterior slope on each 
side bounded by an angle as in Plicataria. 
M. TriancuLaris. Lam. 18.—H. t. 253. f. 3. Triangular, 
solid, white with transverse plaits and scattered chesnut spots which 
become larger as they approach the margin ; slopes grooved ; lateral 
teeth cross-ribbed and elongated.— The figure quoted by Lamare 
as nearly twice as broad as it is long, depressed and marked with 
darker transverse bands on the depressions. 2..11. 
M. Lacrea. Lam. 19.—An. Gmel. no. 11?—M. Sourpa. 
Payr.p.30.—Poli. 1. t. 18. f. 13, 4. (magnified). —An.M. Corat- 
Lina. Lin.? Ovate-triangular, sub-equilateral, rather longer and 
slightly narrower posteriorly, very white, sub-turgid, thin, pellucid, 
delicately striated concentrically, the ventral edge much rounded. 
3-—Mediterranean. Poli represents the depressions as very strong 
and apparently grooved. 
M. Apsreviata. Lam. 20. Obtusely triangular, transversely 
shortened, white with the depressions elegantly plaited. 12.— Port 
Jackson in New Holland. 
M. Ovatina. Lam. 21.—Deless. t.3. f. 7. Ovate, thin, pel- 
lucid, white, finely striated near the margin, anterior slope bounded 
by an angle; beaks very smooth. 12.—Jndian Ocean? 
M. Aupa. Lam. 22.—Ch. f. 220, 1?—E#. t. 254. fi 5? 
Obtusely triangular, turgid, diaphanous ; with minute transverse 
striee, anda few longitudinal obsolete lines. 2.— Indian Ocean. 
M. Souipa. Lin. 1126.—D. p.140.—Lam. 23.—Don. t. 61. 
—Ch. f. 229, 0.—Mont. p. 92.—Turt. B. p. 67.—W. t. 6. f. 
21.—List. t. 253. f. 87. Sub-triangular, nearly equilateral, thick, 
opaque, slightly depressed from the beaks at both extremities, nearly 
smooth, witha few coarse concentric ridges, yellowish-white ; within 
glossy white and the lateral teeth striated. 14..13.—Hurope.! 
M. Squauipa. Lam.26. Sub-triangular, tumid, ineequilateral, 
yellowish obscurely speckled with fulvous ; anterior side the longer, 
and stained with brown. 1-°,.—The shell I have figured agrees 
exactly with this brief description, but is, I fear, no more than a 
variety of Maculata. 
M. Brasrirana. Lam. 27,—An. M. Fraetus, Ch. f. 235.~ 
An. D. p. 145. in part.— Turt. B.t. 4. f. 10. Ovate-elliptical, 
sub-equilateral, sub-triangular, nearly smooth ; anterior slope with 
obliquely diverging longitudinal striz, epidermis brown. 22.— Rio 

1M. Castanea, Lam. 23, is a depressed and rubbed variety of this 
species, and M. Rufa, Zam. 24, is a rubbed Stultorum. 
