TRIBE NYMPHACEA, 67 
T. Lurea. Gray in W. 8S. t. 1. f. 3. T. Guitrorprana. 
Grif. Cuv. Mol. t. 19. f.2.—T. Arrernipentata. Brod. Z. J. 
4.—Beechey. 3. t. 44. f. 5.? Ovate-oblong, anteriorly obtusely 
cuneiform and longer, the fold indistinct ; compressed, white stained 
interiorly with orange, with raised transverse rib-like striz : liga- 
ment very large, cardinal teeth indistinct, no lateral ones. 13,..23. 
T. Acura. Wood. G. C. t. 44. f. 1.—D. p.81.—W. t. 3. 
J: 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, ims one lateral tooth. 2..34.— 
W. Indies. 
TiSreras, Con: Jom. An. Ss Phils 7s pe. 257) Dei- 
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. 14..2.—U. California. 
T. Putcuerrima. Sow. Tank. t.1. f. 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. 14..3. 
T. Sancurnea. Wood. G. C. t. 44. f. 2.—D. p. 88.—W. t. 
4. f. 27. Oblong, acutely angulated, anteriorly sub-equilateral, 
rosy red, with strong transverse and almost imperceptible longi- 
tudinal striz ; paler within, with two teeth in one valve and one in 
the other, besides sharp-pointed lateral ones. #$..1{. 
T. Lanceouata. Gmel. 3236.—D. p. 88. Wood. Gi Cot 
45. f. 2.—Ch. f. 103.—W. t. 4. f. 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. }..13.—India. 
T. Hyauina. G'mel. 3235.—D. p. 85.—Ch. F- 99.—W. t. 
4. f. 39. —Elongated oval, inequivalve, white, brittle, pellucid, com- 
pressed ; anterior side attenuated and twice as long as the get 
rounded at both ends, margins very acute: no lateral teeth. 12 
23.— Guinea. 
* * Orbicular or rounded ovate. 
T. Remres. Lin. 1119.—D. p. 94.— Wood. G. C. t. 38. f. 1. 
—W.t. 4. f.69.—T. Sutcata. Lam. 32.—Rum. t. 42. ae 
—Ch. f. 113.—E. t. 290. f. 3.—T. Convexa. W.S.t.1.f. 2. 
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