62 TESTACEOUS MOLLUSCA. 



very delicately striated transversely, white with a purple cross upon 

 the beaks. 1 14. 



T. Spengleri. Gmel. 3234.— Z>. p. 80.— Lam,. S.—Ch.f. 88. 

 — E. t. 287./. 5. — W. t. 4.f. 35. Elongated and narrow with an 

 attenuated and inflected beak, and angular at both extremities, with 

 a ridge of spinous teeth running from the beaks downwards : hinge 

 nearly central, but inclined to the posterior side : white tinged with 

 pink at the beaks, transversely striated. f-..2j. — Nicobar Isles. 



T. Rostrata. Lin. 1118.— D. p. 84.— Lam. 9.— E. t. 289. 

 /. l.— Ch.f. 105.— W. t. 4. /. 28.— Wood. G. C. t. 37. f. 3, 

 Elongated oblong, sub-equilateral, rounded at the posterior ex- 

 tremity and forming an angular beak at the anterior ; thin com- 

 pressed polished, and nearly smooth, rose-coloured within and 

 without ; beak straight with a sinus in the ventral margin at its 

 commencement. f-..2. — India. 



T. Sulphtjrea. Lam. 11. — T. Pallescens. D. p. 84. —Ch. 

 f. 104.- — Born.t. 2.f. 12. Oblong, the anterior extremity sinuated 

 and angulated, the posterior rounded and longer ; citron colour or 

 yellowish, nearly smooth, ligament nearly concealed : with lateral 

 teeth. — Variety. Whitish with a tawny tinge near the beaks, and 

 pale orange within. — Variety. With the apices pink and sub- 

 radiated. — Variety. With brown-pinkish rajs. — Variety. (Lati- 

 rostra. Lam. 10. — E. t. 228. f. 6.) With pale yellowish rays 

 on a rosy ground. 1 . . 2. — India. 



T. Foliacea. Lin. \\\7*—D.p. 80.— Z>w. 12— E. t. 287. 

 f. 4,—Ch.f. 95.— W. t. 3.f. 20. Oval, angulated and subtrun- 

 cated at the anterior extremity, the margin of whose slope is toothed, 

 and rounded posteriorly ; thin, very depressed, golden yellow and 

 finely striated transversely : hinge with the lateral teeth very close 

 to the beaks. If .3^.— India. 



T. Operculata. Gmel. 3235.—Lam. 13.- Wood. G.C.t. 

 42. f. \. — W. t. 4.f. 37.— Sow. G.f. 1.— Reeve, t. 55. /. 1.— 

 T. R/ufescens. JD. p. 85. — Ch.f.97. Oblong, one valve darker 

 and more convex than the other, crimson, minutely decussated near 

 the ventral margin, elsewhere glabrous : anterior side rather the 



1 1 do not know this species, but the described characteristics apply 

 well enough to the T. Elegans of Wood. T. Elegans. W. S. t. 1. 

 f. 5. Oblong, sub-equilateral, somewhat convex, anteriorly slightly 

 longer attenuated and subrostrated, the ligamental edge greatly 

 sloping and rounded at the extremity, the anterior fold almost 

 obsolete : ivory white, highly polished, obsoletely marked with dis- 

 tant radiating striae and the beaks marked with a scarlet cross : in- 

 side rayed with pale scarlet, a single posterior lateral tooth in 

 one valve ; cartilage very large. If ,.3 \. — Very like Radiata. 



