2i6 Bulletin 31 216 



PLATE 15 

 Figure Page 



1. Peden cazucazvensis, n. sp., X 1.5 27 



From a gutta-percha squeeze of the umbonal region of a 

 right valve. 



2. The same, surface markings more distinctly shown. 

 The same, X 1.5, right valve showing some of the exterior. 

 The same, X1.5, portion of the surface of a right valve showing 

 surface in fair state of preservation. 

 The same, X 1.5. interior impression of left valve. 

 The same, X 1.5, fragment showing exterior characteristics of 

 large left valve. 



The same, X i.i, showing exterior of left valve about the peri- 

 phery. All the above are from near Cawcaw Swamp; S. C. 

 Pedefi dat'keanus Aid., X 1.5 25 



The same, specimens loaned by Aldrich from the type local- 

 ity, Sowilpa Cr., Ala. 



10-13. Peden darkeaniis hXdi., X 1.8, var 26 



Showing form, size, character and variation in surface mark- 

 ing. Hamilton Bluff, Ala. 



14. Peden sdntillatus Q.o\\., X2.8 28 



From the Jackson beds of Miss. Here inserted for compari- 

 son with the following : 



15. Peden scinfillatus \&r. corneoides, n. var., X i 28 



Left valve. 



16. The same right valve. Both valves from St. Maurice, La. 



17. Atnussiiun squamuliDn Lam. ?, X 4 28 



18. The same, X 4, cast of hinge area, opposite, or right valve. 

 From Negreet Bayou. 



18 a. The same, X 6, showing well preserved exterior markings. 



