232 



The restored cranium of this fish is about one foot to eighteen inches in 

 length. It is of lanceolate form, with a very wide gape of mouth, which 

 opens terminally. The entire length of the fish, estimated on the basis 

 of E. semianceps, would be about forty inches. 



Empo mekkillii, Cope. 



Indicated by numerous portions of cranial bones, including those sup- 

 porting the teeth. On the proximal part of the premaxillary, the large teeth 

 grade into those of the small inner series insensibly ; at the distal end, the 

 two large ones of the inner side are opposite to the reduced ones of the outer 

 series. Both maxillary and mandibular teeth are striate-grooved on the outer 

 side at the base. The tongue- shaped pharyngeal bone is peculiar in not 

 being widely expanded at one end, and in having a narrow basis generally for 

 the two rows of teeth it supports. The ? palatine bone exhibits the teeth en 

 brosse seen in E. semianceps, but principally on one side, and the thickened 

 edge supports on one of its marginal angles a series of much larger conical 



teeth. 



Measurements. 



M. 



Width of tho maxillary interiorly at tho raiddlo 0. 012 



Depth of the maxillary distally g 0.018 



Depth of the maxillary proximally 0. Oil 



Depth of the 'palatine 0.018 



Width of tho tongue-shaped bone at the middle 0. 009 



Niobrara epoch of Ellis County, Kansas. Dedicated to Professor Merrill, 

 of Topeka, who has made a number of important additions to our knowledge 

 of the extinct vertebrata of Kansas. 



Empo contkacta, Cope. 



Considerable portions of a cranium of a species of the lesser size of the 

 E. semianceps resemble corresponding parts of that species, with certain 

 marked exceptions. These are seen in the flatness of the maxillary bone, and 

 the large size of the inner row of teeth. The inner face of the premaxillary 

 is very narrow, by reason of the depression of form. The proximal end 

 of the same is, on the other hand, a little compressed. A single row of large 

 teeth occupies it, extending along the inner alveolar border. Those of the 

 outer row appear to be wanting for a considerable distance, and are at first 

 no larger than those of the inner. On the outer lace, at the distal end, the 

 usual fossa on the upper half is wanting; the face from the alveolus being 



