TRIBE NYMPHACTA. 65 



T. ScALARis. Lam. 29. Ovate, rather compressed, yellowish 

 white, with elegant transverse striae ; anterior side the shorter and 

 sub-biangulated. 1|. — In shape and strice not unlike the fossil 

 Scalaroides. {An. dn Mus. vol. 7-t4l.f.7.) 



T. PsAMMOTELLA. Lam. 30. — Ch. f. S7 ? Ovate, with very 

 fine transverse striae, 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. \^. — not unlike Ch. 165^.i 



T. Lantivyii. Payr. Cat. t. \.f. 13, 4. Small, ovate- 

 triangular, thin, compressed, M^hite, pellucid, shining, very inequi- 

 lateral, with elegant transverse striae : posterior side the longer and 

 rounded, anterior shortened and angulated — Corsica. 



T. Oudardi. Payr. Cat. t. 1. /. 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. Clathrata. Quay. Ast. t. 81./. 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 striae ; posterior sinus scarcely evident. — 

 South Seas. — Not tmlike Fabida, hut the oblique .stria are on both. 

 valves. 



T. PoLiTA. Say. Jour. A. N. S. Phil. 2. p. 27(5. 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. |. .i§. — South 

 Carolina, ^'c. 



T, Ten ERA. 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, -^o • -i- — 

 JVew .Jersey. 



T. Tenta. Say. Am. C t. 6.5./. 3.— Gould. Mas. p. 68. /. 

 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, is the T. Oblonga. Gmelin. 

 3234. — Chemnitz.f. 87.— Dp. 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 arcuated ; inside pale orange, hinge with a bifid and a narrow 

 simple cardinal tooth in each valve: no lateral teeth. ^..\\.-~ 

 S. America? 



V 



