243 



Measurements. 



M. 



Length from the basis of Pectoral ray No. I. to Ventral ray 12 0.083 



Length from the basis of P. I. to A. 1 0. 0985 



Length of the ventral fin 0. 0178 



Width of the ventral fin distally 0.013 



Length of the basis of D. 2 0.0168 



Width of the body 0.047 



Width of the pelvic bones together 0. 016 



Length of the pelvic bones together 0. 016 



The size of this species is about that of a one-pound brook-trout. 

 From the bed No. 2 of the Cretaceous of Meek and Hayden. Found 

 in digging a well at Bunker Hill station on the Pacific Railroad of Kansas. 



SELACHII. 



Remains of sharks and rays are far less abundant in the Cretaceous 

 of Western Kansas than in New Jersey, and are much exceeded in abundance 

 by the physostomous Actinopieri, as the present account indicates. In the 

 region near Fort Hays and Salina, sharks' teeth are more frequently found. 

 The cestracionts are, on the other hand, more abundant, since five spe- 

 cies of Ptychodus Ag. have been found in No. 3; in beds in various parts of 

 Kansas and Colorado. 



CALEOCERDO, Miill., Henl. 



Galeoceedo crassidens, Cope. 



Established on two teeth of the type of G. aduncus, Agass., i. e., with 

 one cutting-edge much more convex than the other. The processes of the 

 fang are rather narrow ; that beneath the convex cutting-edge the most so. 

 The apex of the tooth is very short, entirely plane, and stands over the middle 

 or inner edge of the wider process of the fang. The shorter cutting-edge is 

 straight or convex to near the base, where a short divergent heel develops 

 itself. The anterior edge is strongly convex, and all the edges are denticu- 

 late. One side is more convex than the other. No denticles. Cementum 



smooth. 



Measurements. 



M. 



Length of the basis 0.014 



Height of the crown 0.01 



Height of the root 0. 005 



Width of the tooth at the contraction 0] 



