TRIBE NYMPHACEA. 65 
T. Scatarts. Lam. 29. Ovate, rather compressed, yellowish 
white, with elegant transverse strie ; anterior side the shorter and 
sub-biangulated. 12.—In shape and strie not unlike the fossil 
Scalaroides. (An. du Mus. vol. 7.t 41. f. 7.) 
T. Psammoretua. Lam. 30.—Ch. f. 87? Ovate, with very 
fine transverse stri#, and angulated and sinuated on the anterior 
side which is the shorter one; whitish with the beaks rosy and the 
interior imperfectly and unequally rayed with orange and purple or 
rose colour. 12.—not unlike Ch. 1654.1 
i ibansivenin Payr> Cateits Vif Yaya: Small, ovate- 
triangular, thin, compressed, white, pellucid, shining, very inequi- 
lateral, with elegant transverse strize : posterior side the longer and 
rounded, anterior shortened and angulated — Corsica. 
T. Ouparpt. Payr. Cat. t.1. f. 16, 7, 8. Oval compressed, 
shining, pellucid, red within and without, obliquely cancellated and 
adorned by transverse white lines and rather small longitudinal red 
ones, and with reddish yellow rays at both extremities.— Corsica. 
T. CuatHrata. Quoy. Ast. t. 81. f.4, 5, 6, 7. Small oblong 
transverse inequilateral, posterior side the shorter and truncated ; 
thin, fragile, white rosy or red with a kind of lattice work composed 
of oblique and transverse strize ; posterior sinus scarcely evident.— 
South Seas.—Not unlike Fabula, but the oblique strie are on both 
valves. 
T. Pourra. Say. Jour. A. N.S. Phil. 2. p. 276. Sub-tri- 
angular, white, minutely wrinkled concentrically ; anterior side rather 
shorter, its dorsal edge sloping in a straightish line to a sub-acute 
termination ; ventral edge nearly straight from behind the middle 
to the anterior end, a lateral posterior tooth. 2. .43.—South 
Carolina, é'c. 
T. Tenera. Say. Jour. A. N. S. Phil. 2. p. 303.—Gould. 
M. f. 44. Oblong, sub-oval, longer posteriorly, very thin, pel- 
lucid, compressed, whitish, irridescent, concentrically wrinkled, 
the ventral edge arcuated ; cardinal teeth two, the larger one emar- 
ginate, the posterior tooth little elevated, anterior obsolete. ;3,..$.— 
New Jersey. 
T. Tenta. Say. Am. C.t. 65. f. 3.—Gould. Mas. p. 68. f. 
43. Small, thin, oval, white, shining, not polished, shorter and 
narrowed anteriorly, but rounded and obtuse at the tip, ligamental 


1 Allied to, if not identical with this, isthe T.OsLonca. G'melin. 
3234.— Chemnitz. f. 87.—D. p. 80. Oblong, smooth, thin, convex, 
whitish with a tinge of orange which is strongest near the umbones; 
posteriorly rather longer, rounded ; anteriorly obtusely angulated, 
with a distinct flexure ending in a sinus at the margin : ventral edge 
little areuated ; inside pale orange, hinge with a bifid and a narrow 
simple cardinal tooth in each valve: no lateral teeth. 3.,13.— 
S. America? 
F 
