TRIBE NYMPHACEA. 63 
longer and having an angular slope separated in the convex valve by 
an elevated ridge, and bya corresponding depression in the other : 
hinge with two cardinal teeth (one cleft) in the convex, a single tooth 
in the flatter valve : no lateral teeth. 14..23.— South America ? 
— East Indies. 
T. Rosza. Lam. 14. Ovate-triangular, rather convex, pink, 
becoming darker at the beaks and interior, very indistinctly decus- 
sated. 2..3.—California. 
T. Exuierica. Lam. 16. Oblong-elliptic, very finely striated, 
thin, whitish with the beaks purplish, and slightly tinged with 
orange, but more so in one valve than the other: orange within. 3. 
T. Marearitina. Lam. 18.—Del. t.6.f. 4. Oval, attenu- 
ated and longer anteriorly, thin, pellucid, polished white ; inside 
slightly pearly. 2—Nenw Holland. 
T. ALBINELLA. Lam.17. Ovate-oblong, very flat, thin, pellucid 
whitish, with the beaks indistinctly horn-coloured : anterior side 
attenuated and sub-angulated. 12.—New Holland. 
T. Srrigosa. Gmel. 3239.—D. p. 82.—Lam. 19.—Adans. 
t. 17. f. 19.—W. t. 4. f. 61.  Ovate-oblong, sub-equilateral, 
anteriorly attenuated and sub-rostrated, posteriorly rounded, rather 
flat, sub-striated transversely, white .within and without, with 
lateral indistinct greyish or yellowish bands: hinge with not more 
than asingle tooth. 24.—W. Africa. 
T. Puanata. Lin. 1117.—Lam. 20.—D. p. 81.—W. t. 3. f. 
24.—T. Compianata. Gmel. 3239 —Poli. 1. t.14.f. 1 to 15. 
—Born. t. 2. f. 9.—An. var.? Ch. f. 98. Ovate, sub-equi- 
lateral, anterior side ventrally sub-angulated, sub-striated trans- 
versely, reddish fulvous at the beaks, and interior, elsewhere whitish 
tinged with the same colour: a bifid and simple cardinal tooth in 
one valve, a bifid one in the other, no distant lateral ones. 32h. 
Mediterranean.? 
T. Punicea. Gimel. 3239.—(T. Aneutosa. Gimel. 3244.)— 
D.p. 90.-—Lam, 21.—Born. t. 2. f. 2.—E. t. 291. f. 2.—T. 
Strata. Ch. f. 1654, 5.—Dorset. Cat.7.f. 5.—W. t. 4. f. 64. 
Elongated-oval, sub-inequilateral, slightly angulated and inflected at 
the shorter anterior end, rather thin, crimson, varying in depth and 
often with paler unequal bands, deeply and regularly striated trans- 
versely ; cardinal teeth cleft ; with lateral ones.— Variety. White. 
—{',.- 1,%5.-— Mediterranean. 
T. Depressa.* Lam. 22.—W. t. 4. f. 48.—Gimel. 3238.— 
Turt. Biv. t. 8. f.6.— Don. 5. t. 163.—Gualt. t. 88. L.—T. In- 
* We have given a copy of the T. Fravescens, Ch. f.98.—(W. 
t. 4. f. 88.) which Mr. Deshayes considers as a variety of this 
species. 
