47 



A single row of large teeth occupies it, extending along the inner alve- 

 olar border ; those of the outer row appear to be wanting for a consid- 

 erable distance, and are at first no larger than those of the outer. On 

 the outer face at the distal end the usual fossa on the upper half is want- 

 ing, the face from the alveolus being continuous with that of the rising 

 lamina. The pharyngeal bone is flat and expanded behind. The dentary 

 is acuminate distally, and the mental foramen issues in a groove, which 

 passes around the end. The inferior external fossa commences some 

 distance behind the foramen. External face of dentary striate. 



Measurements: 



M. 

 Length of maxillary (constructed from fragments from opposite 



sides) 0.118 



Width below at middle Oil 



Depth of inner face 004 



Depth of outer face Oil 



Length of bases of five proximal teeth 027 



Width of pharyngeal bone at middle 010 



Depth of dentary 2'"«' from end 012 



From the Kiobrara epoch of Trego County, Kansas. Discovered by 

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



STRATODUS, Cope. 



Proceed. Amer. Philosoph. Society, 1872, 348. 

 Stratodus apicalis. Cope, loe.cit.,34:9. 

 Niobrara epoch of the Smoky Hill Eiver. 



APSOPELIX-, Cope. 



Hayden's Annual Eeport, 1870, 423. 

 Apsopelix sausiformis. Cope, loo. cit.^ 1870, 424. 

 Benton epoch at Bunker Hill, Kansas. 



SSLACHII. 



SPORBTODUS, Cope. Gen. nov. 



Established on teeth resembling the posterior or pavement teeth of 

 Seterodontus. Their arrangement cannot be described, as they are only 

 known by separated specimens. Their surface is regularly convex, and 

 covered with a dense layer, which does not exhibit pores, and is thrown 

 into transverse or oblique ridges. iTo root is preserved in the specimens, 

 but the basis is coarsely porous. 



Sporetodus janevaii, sp. nov. 



A small tooth, probably lateral, is an oval, with its surface thrown 

 into four folds, which traverse it obliquely from border to border. At 

 the base of the outer at one end is a series of adherent tubercles ; at 

 the basis of that at the opposite end is a broken fold, with tubercles at 

 its outer base. Length, 0™.0045 ; width, 0'".0025. A portion of a larger 

 and more central tooth has the surface with an unsymmetrical con- 

 vexity, and crossed transversely by five lolds. 



