70 TESTACEOUS MOLLUSCA. 



mate smaller one in the other, no lateral teeth. | . .^. — EnylamU 

 — Guifiea. — (Foreiy/i specimens larger.) 



T. Capsoides. Lam. 44. Broadly triangular, sub-equilateral, 

 with transverse striae somewhat decussated by vertical ones, white : 

 the angle of the anterior side with two grooves : no lateral teeth. 

 1|. — Isle of St. Peter and St. Francis. — Not unlike Poly- 

 fjona. 



T. Decussata. Lam. 45. Rounded triangular, white with 

 the beaks yellowish and nearly smooth, nearly equilateral, decus- 

 sated by transvei'se stria? and vertical grooves : hinge with lateral 

 teeth. — New Holland. 



T. Brasiliana.* Lam. A6. — Lineata. Tiirt. Biv. p. 99. f. 

 1 . f. 1. Triangularly oval, anteriorly angulated, thin, white usually 

 tinged with rose-colour, nearly smooth, an oblique purplish rosy 

 stripe (visible also in the interior) running from the beaks to the 

 slightly longer posterior extremity : one valve with two cardinal and 

 two lateral teeth, a single cleft cardinal tooth in the other, f . . |. 

 — Rio Janeiro. — Approxhnatincj to Tenuis in shape. ■ 



T. OnLiauA. iam. 47.-7-^?i.T. Madagascarfensis. Gmel. 

 3237.?— i>. p. 82.1— List. t. 386. /. 2d3.-Wood. G. C. t. 39. 

 f. 3. ? — IF. t. A.f. 46. ? Triangularly oval, the anterior side the 

 longer and obliquely attenuated, posterior very short and rounded ; 

 greyish, compressed and very finely striated transversely. 2. — Mada- 

 gascar. — Injicctionof the anterior side and margin scarcely apparent . 

 T. Umbonella. Lam. 48. Small, subtriangular, convex, with 

 the anterior side the shorter, and slightly angular, wliitish with the 

 the beaks hyaline, sub-antiquated, the transverse striae very fine. 

 1-3-. — New Holland. 



''T. Deltoidalis. Lam. 49.— Del. t. 6. /. 7. T. Lactea. 

 Ast. t. 81. f. 14, 5, 6. Rounded, ovate, dirty white, compressed 

 and transversely striated ; the anterior side obliquely attenuated and 

 inflected ; one of the valves grooved ; hinge'sub-central, with lateral 

 teeth. — Variety. With the striee very elegant and the anterior side 

 scarcely inflected. If. — New Holland. 



T. Nymphalis. Lam. 50. Roundish-ovate, anterior side ob- 

 liquely attenuated angulated and grooved, the posterior rounded and 

 broad ; whitish with transverse stride towards the ventral margin, 

 beaks smooth ; nymphaj interaal, dilated : hinge with very unequal 

 cardinal teeth in one valve and a single one in the other, no lateral 

 teeth. 1 1. — Guinea. 



T. SoLiDULA.* Xam. 51.— TF. t. A. f. BA.—Wood. G. C. t. 

 46./. 2.— T. ZoNATA.— Gmel. 3238.— L). p. 100.— Lis.t. 405. f. 

 250.— T. Rubra. Da Costa, t. 12./. 4.— Psammobia S. Ttirt. 

 B.p. 95. /. 8./". 2. Rounded triangular, thick, ventricose some- 

 what angulated and compressed anteriorly, passing from white into 

 yellow or pink with darker bands and obsolete ridges of growth : 



