214 BUI^LETIN 31 3H 



PI,ATK 13 

 Figure Page 



1. Peden deshayesiJ-iea^vax., X2 19 



This seems to be a variety of deshayesi, but larger, more circu- 

 lar in outline, slightly less ventricose in the umbonal region, 

 with a greater umbonal angle and more orderl}- costation than 

 tlie nsnal deshayesi . The specimen is stained reddish and 

 doubtless came from the Sadella layer iust above the "sand", 



2. Pecten deshayesi, X ^ 20 



Left valve of the lyelli t3^pe, rare. 



3, 7. The most common type of Pecten at Claiborne ; heights 17 and 



25 mm. ; the one to which Lea gave the name of lyelli. 



4, 5. Pecten deshayesi Lea ; X 2 ; portions of left valves. 



6. Pecten deshayesi \4^& ; X 1.6. Much like the type specimen 

 though showing imbricate sculpture much more definitely, but 

 with less pronounced intercostal ribbing. 



8. Pecten sp., X 1.5, "worn" valve oi deshayesi as interpreted by 

 authors. Its orbicular form, lack of agreement in most all re- 

 spects with the ordinary right valves of this species, generally 

 called lyelli would seem to place such forms in another species. 

 Possibly these smooth-ribbed forms had better berefsi-red to a 

 variety of our cawcawensis. 

 All the above are from Claiborne, Ala. 



