62 TESTACEOUS MOLLUSCA. 
very delicately striated transversely, white with a purple cross upon 
the beaks.1 14. 
T. Spencieri. Gimel. 3234.—D. p. 80.—Lam. 8.—Ch. f. 88. 
—E. t. 287. f.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. 3..24+.— Nicobar Isles. 
T. Rosrrata. Lin. 1118.—D. p. 84.—Lam. 9.—H. t. 289. 
Sf. 1.—Ch. f. 105.—W. t. 4. f. 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, 2..2.-—India. 
T. SutpHurea. Lam.11.—T.Pauiescens. D.p.84.—Ch. 
J. 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 rays. — Variety. (Lati- 
RostrRA. Lam. 10.—L. t. 228. f. 6.) With pale yellowish rays 
on arosy ground. 1..2.—India. 
T, Fouracea. Lin. 1117.—D. p. 80.—Lam. 12 —E. t. 287. 
Jf. 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. 13..34.—India. 
T. Opercutata. G'mel. 3235.—Lam. 13.— Wood. G. C. t. 
42. f.1.—W.t. 4. f. 37.—Som. Gf. 1.— Reeve. t. 55. fe 1.— 
T. Rurescens. D.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 


1T do not know this species, but the described characteristics apply 
well enough to the T. Elegans of Wood. T. Exrcans. W. S. ¢. 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 striee 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. 13..33.—Very like Radiata. 
