126 



Plate III. 

 Darhya muUistriata (Meek). 



1. Brackial valve of a specimen with an extremely elongated beak. 

 Shell adhering to it. 



2. Brachial valve of another specimen showing its regular form and 

 the surface marks. 



3. Another specimen, iirotile view, with beak extending backwar<l aiitl 

 twisted to the right. 



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

 than normal. 



."». A pen 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 niillimeters 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. 



