T. BIMACULATA. Lin. 1120. D. p. 101. Lam. 

 52. Ch. f. 127. E. M. t. 290. /. 9. Da. Cos. p. 

 213. Pen. 4. p. lS3.Mont.p. \69.-Lin.T. S.p. 

 67. Don. t. 19./.1. Dor. Cat. p. 31. t. 5. /. 7. 

 Wood. G. C.p. 192. t. 45. /. 6, 7. Turt. C. D. p. 

 178. F. p. 435. Turt. B. p. 104. Rounded-trian- 

 gular, nearly smooth ; obtusely truncated, a little 

 angular and shorter anteriorly ; compressed, variable in 

 colouring, being often white with a deep red oblong 

 spot on each side of the hinge, sometimes uniform 

 whitish, cream coloured or violet, at times with linear 

 purple arrow headed radiating markings (Turt. B. t. 8. 

 /. 6.) or with six (T. SEXRADIATA. Lam. 53. E. M. 

 t. 290. /. 10. Ch. f. 1326.) purplish brown rays; 

 hinge with a single cardinal tooth in one valve, two in 

 the other, two lateral in each. i...iK W. Coasts. 



T. DEPRESS A. Gmel.323S.-Lam. 22. D. p. 91. 

 Pen. 4- p. 179. Don. t. 163. Lin. T. p. 51. 

 Dor. Cat. p. 30. t. 5./. 2. Wood. G. C. p. 171. t. 

 45. f. 3. Turt. C. D.p. 171. Turt. B. p. 105. t. 8. 

 /. 6. T. SQUALIDA. Mont. p. -56 F. p. 436. T. 

 INCARNATA. Poll. 1. t. 15. /. 1. Oval-oblong, ante- 

 riorly produced, attenuated and pointed, posteriorly 

 rounded, ventral edge little arcuated in the middle ; 

 compressed, pinkish flesh colour or orange, with two 



