TRIBE MACTKACEA. 3l 



M. SuBPLlCATA. Lam. 17. — Ch.f. 205, 6. Triangular, thin 

 white, somewhat plaited at the sides near the beaks, disc smooth ; 

 hinge with a lateral bilobed tooth. — A large species intermediate 

 between Carinata and Striatclla, having its anterior slope on each 

 side bounded by an angle as in Plicataria. 



M. Triangularis. Lam. \S. — E. 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 Lamar c 

 is nearly twice as broad as it is long, depressed and marked with 

 darker transverse bands on the depressions. J-..1-J-. 



M. Lactea. Lam. 19. — An. Gmel. no. 11? — M. Solida. 

 Payr. p. 30.— Poli. 1. t. 18./ 13,4. {magnified).— An.M.Coral- 

 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. 

 §. — Mediterranean. Poli represents the depressions as very strong 

 and apparently grooved. 



M. Abbreviata. Lam. 20. Obtusely triangular, transversely 

 shortened, white with the depressions elegantly plaited. If. — Port 

 Jackson in New Holland. 



M. Ovalina. Lam. 21. — Deless. t. 3. f. 7. Ovate, thin, pel- 

 lucid, white, finely striated near the margin, anterior slope bounded 

 by an angle; beaks verv smooth. If. — Indian Ocean? 



M. Alba. Lam. 22. — Ch. f. 220, It—E. t. 254. f. 5? 

 Obtusely triangular, turgid, diaphanous ; with minute transverse 

 striae, and a few longitudinal obsolete lines. 2. — Indian Ocean. 



M. Solida. Lin. 1126.— D. p. 140.— Lam. 23.— Don. t. 61. 

 — Ch. f. 229, 0.— Mont. p. 92.— Tart. 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, with a few coarse concentric ridges, yellowish-white ; within 

 glossy white and the lateral teeth striated. lj..lf. — Europe. 1 



M. Squalida. Lam. 26. Sub -triangular, tumid, insequilateral, 

 yellowish obscurely speckled with fulvous ; anterior side the longer, 

 and stained with brown, 1^V~ -The shell I have figured agrees 

 exactly with this brief description, but is, I fear, no more than a 

 variety of Maculata. 



M. Brasiliana. Lam. 27.— An. M. Fragilis, Ch. f. 235.— 

 An. D. p. 145. inpart.— Turt. B. t. 4. /. 10. Ovate-elliptical, 

 sub -equilateral, sub-triangular, nearly smooth; anterior slope with 

 obliquely diverging longitudinal strise, epidermis brown. 2f . — Rio 



1 M. Castanea, Lam. 23, is a depressed and rubbed variety of this 

 species, and M. Rufa, Lam. 24, is a rubbed Stultorum. 



