68 TESTACEOUS MOLLUSCA. 
Sub-orbicular, slightly convex, white, with the beaks smooth and 
the rest of the surface covered with transverse undulated ridges, 
rather inflected and angulated on the anterior side: hinge with two 
teeth in one valve and one in the other, besides two strong lateral 
teeth of which the anterior one is much more remote.— Variety, 
with obsolete rufous bands. Diam. 21.—India. 
* T. Crassa. Pennant. 4. t. 48. f. 28.—G'mel. 3288. —D. p. 
96.—#. t. 291. f. 5.--W. t. 4. fi. 75.—Lam. 35.—List. t. 299. 
Sf. 136.—Turt. Biv. t. 7. f. 2.—Roundish, thick, heavy, semi- 
transparent, with one valve less convex than the other, anteriorly 
shorter ; white or yellowish, (with usually reddish rays,) crowded 
with transverse furrows which are coarser posteriorly, the beaks 
frequently stained with pink, within yellowish, a simple and bifid 
tooth in each valve besides two lateral teeth in one of the valves. 
13... 2.—urope.} 
T. Fausta. Dil.p.94.—T. Remirs. Lam. 31.—Born.t. 2. 
Jf. 11.—List. t. 266. f. 102.—Ch. f. 112.—. t. 290. f. 2.— 
T. Lavis. Wood. G. C.t. 37. f. 1.—W. t. 4. f. 68. Roundish 
ovate, posteriorly slightly longer and rounded, anterior edge sloping, 
anterior side slightly inflected and obtusely truncated at the tip: 
white, strong, finely but regularly striated transversely, but smooth 
at the beaks, marked with anastomosing fine interrupted radiating 
lines, ventral edge arcuated : inside tinged with yellow, a cleft and 
a narrow simple cardinal tooth in one valve, the latter scarcely 
rudimentary in the other, a distant and an approximated lateral in 
each. 2..22.—W. Indies.2 
T. Scoprnata. Zin. 1119.—D. p. 98.—Lam. 34.—List. t. 
302.f. 143.—F. t. 291. f. 4.—Ch. f. 122, 3, 4.—Reeve. t. 55. f. 
2.—Sow. G.—W.t. 7. f. 67.—Wood. G. C. t. 35. f. 1. Sub- 
orbicular, slightly inflected and angular anteriorly, whitish, rough- 
ened with lunate scales disposed in quineunxes and enlarged in 
size as they recede from the beaks, and usually with a few brown 
or ferruginous scattered spots, sometimes forming rays ; hinge 
central, with bifid cardinal teeth and strong lateral ones in each 
valve. Diameter up to 33.—Indian Ocean. 
T. Leviegata. Lin. p. 103.—D. p. 82.—Lam. 36.—Ch. f. 
111.—Wood. G. C. t. 41. f. 1.—W. t. 4. f. 29.—Roundish- 
ovate, with concentric strize becoming obsolete on the disc, whitish 
with tawny orange rays and the ventral margin tinged with the 
7 When the minute longitudinal strie in the interstices are more 
evident, and the rays absent, it forms the Reticulata of British 
authors, but not of Linneeus. 
* SrriatuLaris, Lam. 33, is apparently a young shell with the 
rudimentary tooth quite obsolete. 
