69 
oblique paler indistinct anterior twin rays, finelystriated 
concentrically ; a lateral tooth on both sides in one 
valve, one only inthe other. 1%...2. W. and Irish 
coasts. 
* * Qval.two teeth in each valve. 
T. Srrrata. Mont. p. 60. t. 27. f. 2.—Turt. B. p. 
106.—F. p. 437.—Lin. T. 8. p. 53.—Turt. C. D. p. 
169.—Oval-triangular, finely and regularly striated 
transversely and very minutely so longitudinally, rosy 
White within and without, deeper towards the hinge ; 
each valve with two lateral teeth. 1...3. 8. Coasts, 
rare. 
T. Tenuis. Pen. 4. p. 180. ¢. 51. f. 2.—Da Cost. 
p. 210.—Lam. 25.—Ch. f. 117.—Don. t. 19. (3 lower 
figs.)—Inst. t. 405. f. 251.—Mont. p. 59.—Lin. T. 
8. p. 52.—Dor. Cat. p. 30. t. 5. f. 3.—Wood. G. C. 
p. 155. t.44. ff} 3,4.—Turt. C. D. p. 169.—Turt. B. 
p. 107.—F. p. 406.—T. Incarnata. D. p. 87.— 
Oval-triangular, nearly smooth, very compressed, thin 
and glossy, whitish, reddish or orange, with generally 
darker bands; anteriorly attenuated ; one of the valves 
with a lateral tooth. %...%. Sandy shores, extremely 
COMMON, 
