74 TESTACEOUS MOLLUSCA,. 
distinct : convex valve with the anterior slope flattened : inside with 
two anterior obliquely radiating ribs. 13. 
T. Srriara.—NSoien S. Chem. f. 57, 8.— Gmel. 3227.—D. p. 
66.—W. t. 3..f.24. Oval, diaphanous, subequivalve, posteriorly 
rather longer and rounded, anteriorily obtuse, ventral edge slightly 
arcuated: glossy, thin, rather depressed, strongly striated trans- 
versely, pink with numerous narrow white rays, a solitary all but 
primary lateral tooth in one valve, cardinal teeth obsolete. 1.. 13. 
— Nicobar.1 
T. Emareinatus. Sow. Tank. Oblong, inequilateral, smooth- 
ish, anteriorly sub-angulated and emarginated, the slope concave in 
both valves, posteriorly twice as long, subattenuated and rounded : 
umbones pale orange and within two darker oblong orange stains, 
passing from the umbo to each muscular scar: a symmetrical fold in 
each valve.—Brazil.—T. Oblonga of Chemnitz, f. 87, much re- 
sembles it, but has no lateral tooth. 
T. Coccrnea.—Tretuna C. Gel. 3236.—D. p. 87.—Ch. f. 
109.—W. ¢. 4. f. 42. Oval, inequivalve, rather compressed, 
rounded at both ends, posteriorly rather longer and broader, very 
thin, pellucid, uniform rose-colour with closely set transverse striz, 
the alternate ones only crossing the anterior slope : nymphe pro- 
minent: in one valve two small cardinal teeth with an approximate 
lateral in the other. 2 ..12—Mediterranean ? 
JT, Purrurgevs. Brod. and Sow. Z, J.4.—Beechey Zool. t. 
42. f. 2.—An, TeLtina Rosea Lam.? Oblong, compressed, sub- 
equilateral, purplish rose-colour, prettily decussated, anterior side 
sub-acuminated and slightly emarginated. 13..2,8,.— Pacific. 
T. TRIANGULARIS.—TELLINA T. Chem. f.85.—D. p.79.— Desh. 
in Lam. vol. 6. p. 209.—W. t. 4. f. 33.—T. Poxirus. Sow. 
Tank. Ovate-triangular, greyish white, transverse, inequilateral, 
depressed, posteriorly shorter and rounded, anteriorly produced 
narrowed and subacuminated : thin, with transverse strize which an- 
teriorly in one valve diverge suddenly towards the ventral margin : 
hinge with two teeth, no lateral ones. 12..2.— Cape of Good Hope. 
CORBIS. 
Transverse, equivalve, without anterior flexuosity, slightly de- 
pressed; beaks ineurved towards each other ; hinge with two 
primary teeth, and two lateral ones, of which the posterior one ts 
nearest the cardinal teeth ; muscular impressions simple. 
C. Fimeriata. Lam. 1.—Son. G'.— Reeve, t.57.—Venus F. 
Lin. 1113.—D. p. 187.— Ch. f. 448.— FE. t. 286. f.3. W.t. 8. 

1-1 almost doubt if Ovalis of Sowerby is distinct from this, and 
even as to either belonging to this genus and not to Psammotea. 
