233 



continuous wiili dial of (lie rising lamina. The tonguo-sliapod bone is Hat, 



and expanded hcliiiid. The dcntary is acuminate distally ; and llu; menial 



foramen issues in a groove, which passes round Ihc distal end. The inferior 



external fossa commences some distance behind the foramen. External face 



of dentary striate. 



Measurements. 



M. 

 Longtli of On: iiiciiKixilhuy ;iiul maxillary (reconstructed from fragments fiom opposito sides). .. 0. 118 



Width below at tlic middlu 0.011 



Depth of the inner face .' 0. 001 



Depth of the outer face 0.011 



Length o/tho bases of fivo proximal teeth 0. 0"J7 



Widtli of the tongue-sliaped hoiu: at the middle 0.010 



Depth of the dentary 'J'"'" from the end 0.012 



From the Niobrara ci)ocli of Trego County, Kansas. Discovered by 

 Prof. 13. F. Mudge, of the State Agricultural College of Kansas. 



Empo SEMiANCErs, Cope. 



Represented by numerous specimens of various individuals from the 

 Kansas chalk. These embrace all the cranial bones in a fragmentary condi- 

 tion, several vertebral columns, and scales. 



These belong to smaller individuals than those referred to the E. nepceolkn. 

 Characters of the species an; to be seen in the ^pterygoid and larger mandib- 

 ular teeth. The former are minute, and cover one side and margin of the 

 bone en brosse without larger series. The latter have a cutting-edge on the 

 posterior aspect of the apex as well as on the anterior. It extends but a 

 short distance, wiiile the anterior rises near the base, and is strongly convex. 

 The tooth curvea backward ; the base is round in section. The convex pos- 

 terior and inner faces are rather finely striate-grooved. The larger teeth of 

 the extcnial series are convex on the inner face; they are two-edged, and 

 slightly incurved. 



Tlie outer face of the; dcntunj hones is strongly longitudinally pandlcl- 

 sulcate. The inner fact; and the surfaces of all the other bones art; minutely 

 striaie, exactly as in some of the; Mosasauroids. The anterior extremity of 

 tlu! jn'ona.rilliiri/ is straight on one side, and oljlitpiely beveled on the othtT 

 to an oblnsc; compressed apex. The bevel becomes sul)vertical posteriorly, 

 suj)porling teelli much as \\\ E. ncpccolicd. Two of its anterior leelii an; a 

 little larger than those that luUow. The sui)[)osetl pluiiyngeal is narrowed to 

 30 c 



