Weller — Kinderhook Fauna! Studies. 113 



bilobed outline. Surface nearly smooth, but with a few faint 

 undulations parallel with the margin of the aperture, and 

 sometimes with very fine, faint lines of growth. 



Remarks. The specimen here illustrated is the most per- 

 fect one of the three types in the University of Michigan col- 

 lection. The specimen referred to this species and illustrated 

 by Keyes * is very different from the types, and should 

 possibly be referred to B. panneus although it is a much 

 more perfect specimen than the types of that species. 



Bellerophon vinculatus W. & W. 



PI. VI. f. 11-12. 



Shell of medium size, subglobose, not umbilicate. Volu- 

 tions expanding somewhat gradually to the aperture. Outer 

 lip deeply notched. Dorsal band rather broad, bounded on 

 either side by a narrow raised rib. The sides of the shell 

 marked by transverse striae which originate at the margins 

 of the dorsal band and pass with a gentle forward curve 

 toward the axis of the shell ; these striae most conspicuous 

 near the aperture, becoming obsolete on the upper part of 

 the shell. 



Remarks. No specimen marked as the type of this species 

 was found in the University of Michigan collection, although 

 it should be preserved in that place. The somewhat dis- 

 torted specimen here illustrated, however, is present in that 

 collection and may be the type although not so labeled. In 

 size this species corresponds with B. bilabiatus, but it may 

 be easily distinguished from that species because of the 

 absence of the expanded aperture and the presence of the 

 conspicuous transverse striae. 



Bellerophon panneus White. ? 



PI. VI. f. 7-8. 



Shell of rather more than medium size, rather broadly um- 

 bilicate, gradually expanded to the aperture, transverse section 

 of the volutions subelliptical in outline. Outer lip broadly 

 notched; dorsal band narrow, subcarinate towards the aper- 

 ture. The lateral surfaces of the shell marked by transverse 



* Mo. Geol. Surv. 5. pi. 50. f. 3. 



