TLATE XLI. 



Paga. 

 PuiONOCYCLUst macombi Meek 172 



Nat. Mus. Cat. Invert. Foss., 22940. 

 Fig. 1. Side view of a small specimen, enlarged 1£ diameters. The draw- 

 ing shows too great a convexity. 



2. Side view of a larger fragment showing the inner volutions, the ser- 



rate keel, and unusually strong nodes near the periphery. 



3. Septum of another specimen magnified. 

 4, 5. Two views of the type (after Meek). 



274 



