TRIBE MACTKACEA. 29 



— jr. t.6.f.22.— M.Gigantea. Lam. \.—E.t.2W.f.\. Solid, 

 oval, subtriangular, nearly smooth; under a thin whitish or yellowish 

 epidermis, pale fulvous, opaque, the ventral edge little arcuated, 

 slopes smooth ; hinge nearly but not quite central, the lateral teeth 

 cross ribbed and elongated. 4. — New York. 



M. Spengleri. Lam. ( 2.~Gmel. 3256.— D. p. 132. — Ch.f. 

 199, 0, l.—E. t. 252./. 3.— Reeve, t. 42. f. I.— Sow. G.f. 1.— 

 IV. t 6 f. 1. Triangular, smooth, both slopes flat, the anterior 

 chiefly so, subdiaphanous, pale brownish ; beaks distant, separated 

 by a transverse cresceut-shaped gap, which contains the ligament. 

 2 . . 3. — Cape of Good Hope. 



M. Striatella. Lam. 3. — E. t. 255. f. 2. Large, pellucid, 

 convex, white, anterior slope obliquely striated, bounded by an 

 obtuse angle ; beaks substriated ; lateral teeth short and smooth. — 

 India. Larger but bearing some resemblance to the next. 



M. Striatula. Lin. 1125.— D. p. 133.— K?i. 6. t. 34. f. 1 — 

 M Carinata. Lam. 4.—E. t. 251. /. l.-M. Alata. W. S.f. 7. 

 Triangular, pellucid, white, convex ; beaks smooth ; hinge rather 

 nearer the posterior than the anterior side which is bounded by an 

 elevated plate with raised angles ; anterior lateral tooth small and 

 close, the posterior elongated. — E. Indies ? 



M. Glauca.* Gmel. 3260.— D. p. 144.— W. t. 6./. 30. — Ch. 

 f. 232. — M. Helvacea. Lam. 5. — Neapolitana. Poli. t. 18. f. 

 1, 2, 3. Triangularly oval, dirty white rayed with fulvous becoming 

 by age of an obscurely rayed red colour, rather depressed, striated 

 transversely ; beaks not quite central, smooth, and recurved, with 

 a narrow gape beneath them. 2|-..3|-. — Spain and Italy. 



M. Stultorum. Lin. 1126. — X>. p. 138.— Lam. l.— Ch.f. 

 224, 5.— Mont. p. 94.— Turt. B. p. 72.— E. t. 256. /. 3.— Don. 

 t. 106.— IT. L 6.f. 18.— Tellina Radiata. Pen. 4. p. 87. t. 49. 

 f. 30. Ovate triangular, thin, slightly depressed from the beaks at 

 each extremity, subdiaphanous, nearly smooth, pale fulvous with 

 obsolete white rays ; beaks nearly central, and, as well as the interior, 

 purplish red. l^..lf. — Europe, the Atlantic. 2 



M. Grandis. Lam. 6.— Gmel. no. 12. — D. p. 139.—E. t. 253. 

 /. 1.— Qh. f. 228.— W. t. 6. /. 19. Triangular, anteriorly the 

 more produced and subrostrated, smooth, fawn colour with paler 

 rays ; beaks tumid and violet-brown. 2^.. 3^. — New Jersey? 



M. Maculosa. Lam. 8. — M. Ornata? Gray in Mag. N.H. 

 1837. Triangularly oval, livid rufous, speckled with white, and 

 marked with paler rays, smooth, subinequilateral ; beaks and sides 



2 The M. Cinerea* of Montagu, Pennant and Turton differs in being 

 proportionately broader, of a pale drab with sometimes one or two 

 obsolete white rays and never lilac internally. 



