70 TESTACEOUS MOLLUSCA. 



mate smaller one in the other, no lateral teeth. | . .f . — England! 

 — Guinea. — (Foreign 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. 

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

 gona. 



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

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

 sated by transverse striae and vertical grooves : hinge with lateral 

 teeth. — New Holland. 



T. Brasiliana.* Lam. 46. — Lineata. Turt. Biv. p. 99. t. 

 7«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. -§■..£. 

 — Rio Janeiro. — Approximating to Tenuis in shape. 



T. Obliqua. Lam. 47. — An. T. Madagascariensis. Gmel. 

 3237. ?— D. p. 82.?— List. t. 386./. 2^.- Wood. G. C. t. 39. 

 f. 3.? — W. t. 4.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. — Inflection of the anterior side andmar gill scarcely apparent. 

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

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

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

 1 J-. — New Holland. 



T. Deltoidalis. Lam. 49. — Pel. t. 6. f. 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 striae 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 striae towards the ventral margin, 

 beaks smooth ; nymphae internal, dilated : hinge with very unequal 

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

 teeth. If. — Guinea. 



T. Solidula.* Lam. 51.— W. t. 4. f. 84.— Wood. G. C. t. 

 46. f. 2.— T. Zonata.— Gmel. 3238.— D. p. 100.— Lis.t. 405. /. 

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

 P.p. 95. t. S.f. 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 : 



