oblique paler indistinct anterior twin rays, finely striated 

 concentrically ; a lateral tooth on both sides in one 

 valve, one only in the other. 1J...2. W. and Irish 

 coasts. 



* * Oval, two teeth in each valve. 



T. STRIATA. Mont. p. 60. t. 27. /. 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. l...f. S. Coasts t 

 rare. 



T. TENUIS. Pen. 4. p. 180. t. 51. /. 2. Da Cost, 

 p. 210. Lam. "25.Ch.f. 117. Don. t. 19. (Slower 

 figs.) List. t. 405. /. 251. Mont. p. 59. Lin. T. 

 S.p.52. Dor. Cat. p. 30. t. 5. f. 3. Wood. G. C. 

 p. 155. t.U.f 3,4. Turt. C. D.p. ie>9.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 . 



