87 



broken reddish rays ; lunule lanceolate and elevated in 

 the middle into a sharp ridge. 2 j. Devon, Scotland, 

 Bantry Bay. 



*V. CANCELLATA. Turt. B. p. 144. t. 10. /. 3.F. 



p. 447. Rounded- heart-shaped, anteriorly angular, 

 white with sometimes a rosy tinge, with nine or ten re- 

 mote transverse plates which are closely cancellated, the 

 interstices with close set radiating riblets ; beaks promi- 

 nent ; lunule cordiform. i. Guernsey. 



V. SUBCORDATA. Mont. p. 121. t. 3./. 1. Pen. 4. 

 p. 204, Lin. T. 8. p. 82. D,p. 166. Turt. C. D. 

 p. 237. Turt. B. p. 145. .F. p. 447. Subcordate, 

 slightly truncated posteriorly, white, strong, ligamental 

 edge sloping rapidly; with strong radiating riblike 

 striae, and remote transverse ridges; beaks much in- 

 curved. J. Falmouth. 



* I feel far from certain that this is really distinct 

 from Turton's Dysera, which is assuredly the Cancel- 

 lata of Lainarc : for the present species, Mr. Turton 

 gives us as synonyms, CANCELLATA. Lin. 1130, 

 Ch.f. 304. and ^6. 



