TRIBE NYMPHACEA. 67 



T. Lutea. Gray in W. S. t. I. f. 3. T. Guilfordiana. 

 Grif. Cuv. Mol. t. 19./. 2.— T. Alternidentata. Brod.Z. .7. 

 4. — Beechey. 3. t. 44. f. 5. 1 Ovate-oblong, anteriorly obtusely 

 cuneiform and longer, the fold indistinct ; compressed, white stained 

 interiorly with orange, with raised transverse rib-like striae : liga- 

 ment very large, cardinal teeth indistinct, no lateral ones. If . .2f . 



T. Acuta. Wood. G. C. t. 44./. 1.— D. p. 81.— W. t. 3. 

 /. 25. Oval, compressed, thin, anteriorly much shorter and cunei- 

 form, posteriorly rounded, very finely striated longitudinally, white 

 with a tinge of yellow near the apex but not perceptibly rayed, 

 ventral edge nearly straight, margins acute : hinge with two teeth 

 in one valve, one in the other, but one lateral tooth. 2 . . 3%. — 

 W. Indies. 



T. Secta. Con. Jour. A. N. S. Phil. 7. p. 257. Tri- 

 angular or sub-elliptical, equilateral compressed, with a very thin 

 shining yellowish epidermis : umbonal slope angulated : anteriorly 

 broadly and obliquely truncated ; cartilage short, thick, inserted on 

 an elongated oblique rib-like callus : margin beneath the cartilage 

 with an ovate gape, appearing as if cut or broken, white within and 

 without. 1^..2. — U. California. 



T. Pulcherrima. Sow. Tank. t. 1./. 1. Transversely oblong, 

 rounded posteriorly and sharply angulated anteriorly, whitish with 

 rosy rays ; ventral surface nearly smooth and obliquely striated ; 

 the extremities roughened by concentric rows of scales ; within 

 orange colour. 1^ . . 3. 



T. Sanguinea. Wood. G. C. t. 44./. 2.—D. p. 88.— W. t. 

 4. / 27. Oblong, acutely angulated, anteriorly sub-equilateral, 

 rosy red, with strong transverse and almost imperceptible longi- 

 tudinal striae ; paler within, with two teeth in one valve and one in 

 the other, besides sharp -pointed lateral ones, f . > 1£. 



T. Lanceolata. Gmel. 3236.— D. p. 88.— Wood. G. C. t. 

 45./. 2. — Ch. /. 103.— W. t. 4. /. 40. Oblong, thin, breadth 

 double the length, sub-equilateral, pellucid, compressed, anteriorly 

 acuminated ; finely striated transversely, uniform white or pink, 

 no lateral teeth in one valve ; inside with two oblique radiating 

 anterior riblets, one very indistinct, f . . 1 J. — India. 



T. Hyalina. Gmel. 3235.— D. p. 85.— Ch. f. 99.— W. t. 

 4./. 39. — Elongated oval, inequivalve, white, brittle, pellucid, com- 

 pressed ; anterior side attenuated and twice as long as the posterior, 

 rounded at both ends, margins very acute : no lateral teeth. 1^ . . 

 2f. — Guinea. 



* * Orbicular or rounded ovate. 



T. Remies. Lin. 1119.— D. p. 94.— Wood. G. C. t. 38. /. 1. 



— W. L 4. /. 09.— T. Sulcata. Lam. 32.— Rvm. t. 42. /'. 1. 



- Ch.f. U3.—E. t. 290. / 3.— T. Convexa. W. S. t. 1./. 2. 



f 2 



