126 



Plate III. 



Derhya fiiiiltistriata (Meek). 



1. Brachial valve ot a specimen with an extremely elongated beak. 

 Shell adhering to it. 



2. Brachial valve ot another speciniei) showing its regular form and 

 the surface marks. 



3. Another specimen, protile view, with beak extending backward and 

 twisted to the right. 



4. Posterior view of another specimen with a hinge a shade lower 

 than normal. 



.1. A ])en drawing of No. .3 of previous plate. Note the mesial septum 

 in the little specimen, the central one of the three to the right of the beak. 

 which is only five millimeters in diameter. 



All figures natural size. 



With the exception of figures 1 and 2 of plate I. all specimens are from 

 the top of the Neosho member of the (4arrison formation, in the railroad 

 cut on the west side of Grouse creek, near the old station of Torrence. 

 Kansas, a few miles west of Cambridge. 



