TRIBE MACTRACEA. 29 



— W. t. 6.f. 22.— M. GiGANTEA. Larn. \.—E. t. 259. /.I. 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. — I^erc York. 



M. Spengleri. Lam. 2.~GmeL 3256.— Z>. p. 132. — Ch. f. 

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

 W. t 6/1. Triangular, smooth, both slopes flat, the anterior 

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

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

 2 , .3. — Cape of Good Hope. 



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

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

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

 India. Laryer but bearing some resemblance to the next. 



M. Striatula. Lin. 1125.— i>. /;. 133.— Kn. 6. t. 34./ I — 

 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.— Z>. p. 144.— PF. t. 6./ 30. — Ch. 

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

 1, 2, 3. Triangularly oval, dii'ty 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.— D. p. 138.— Law. 7.— Ch.f. 

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

 t. 106.— ^r. t. 6./ 18.— Tellina Radiata. Pen. A.p.S7.t.A9. 

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

 each extremity, subchaphanous, nearly smooth, pale fulvous with 

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

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



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

 / l. — Ch. f. 22S.— W. t. 6. / 19. Triangular, anteriorly the 

 more produced and subrostrated, smooth, fawn colour with paler 

 rays ; beaks tumid and violet-brown. 2|-..3^. — Nem 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. 



