PLATE IV. 



Ophioglypha bridgerknsis (M^ek) (page 29^ 



Fig. la. Skeleton, natural Bize. 



Ih. Enlarged view of a portion of the upper surface. 

 Ic. Enlarged view of a portion of the lower surface. 



Ophioglypha tkxana Clark (page 30). 



Fig. 2a. Skeleton. 



2b. Enlarged view of a portion of the upper surface. 



112 



