186 KANSAS UNIVERSITY SCIENCE BULLETIN. 



numerous small tubular openings for the nutriment of the 

 tooth to pass through. As a whole, the base resembles that of 

 the common fossil shark Lamna or of Ptychodus in general 

 structure. As far as the writer is aware, this is the first time 

 that Ctenophychut^ has been reported from the Permian of 

 Kansas. The following measurements have been made : 



mm. 



Width of tooth 16 



Depth from middle denticle to base 20 



Length of longest denticle 4 



Width of longest denticle at base 5 



Depth of inner cup from point of longest denticle 14 



