338 University Geological Survey of Kansas. 



internal row there is a very large tooth, back of which there is 



a broad shallow pit. 



Length to the large posterior tooth 82 mm. 



Greatest transverse width 19 " 



Empo semianceps. Plate LXI, figs. 6-9. 



Cimolicthys semianceps Cope, Proc. Am. Phil. Soc. 1872, p. 351. 

 Empo semianceps Cope, Cret. Vert. West, p. 233. 



The material, consisting of the palatines, fragmentary mandi- 

 bles, and portions of other parts, is referred to this species with 

 some doubt. It seems to correspond with the figure and de- 

 scription of this species as given by Professor Cope, 93 but it may 

 possibly be a specimen of E. merrilli. The specimen, No. 278, 

 was collected from the Niobrara Cretaceous of Graham county 

 by Messrs. Overton and Martin during the summer of 1895. 



The palatine is nearly straight on the internal side and de- 

 pressed above. The teeth are arranged in two series, as in 

 E. nepseolica. The most anterior one of these is rather small, 

 but is followed by two or three that are somewhat larger. The 

 teeth following are of about the size of those just mentioned, 

 excepting toward the posterior extremity, where they become 

 slightly reduced in size. There seems to be a considerable dif- 

 ference in the arrangement of the teeth on the internal side in 

 the two palatines of this specimen. On the bone of the right 

 side there is a continuous row which are directed strongly 

 backward, while on the left there are but two tooth scars pres- 

 ent on the internal side. The pterygoid is very similar to that 

 of E. nepseolica described above. 



Palatine: Length 166 mm. 



Greatest transverse width 10 " 



The dentaries are elongate and contracted in depth at the 

 symphysis, where the lower edge is beveled off to meet the su- 

 perior border, thus forming an acute apex. The external side 

 is covered with longitudinal striae which are not as strongly 

 marked as in E. nepseolica. These striae are more noticeable on 

 the external portion of the articular than on any other part. 

 The lower border is rather sharp but soon becomes thickened 



93. Cret. Vert. West, p. 233, pi. LIU, fig. 6. 



