-?I4 EUIXETIN 31 2, '4 



PLATE 13 

 Figure Page 



1. Pt'den deshayesi 'L&a,\ar., X2 iq 



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

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

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

 the usual deshayesi. The specimen is stained reddish and 

 doubtless came fronv the Sciitclla layer just atove the "sand". 



2. Peden deshayesi, X Y^ 20 



Left valve of the lyelli type, rare. 



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



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



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



6. Peden deshayesi h*ia. ; X 1.6. Much like the type specimen 

 though showing imbricate sculpture much more definitely, but 

 with less pronounced intercostal ribbing. 



8. Peden 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, generall}' 

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

 Possibly these smooth-ribbed forms had better bereferrei to a 

 variety of our cazccaivensis. 

 All the above are from Claiborne, Ala. 



