42 



Erisichthe nitida, Cope, loc. cit. 



Eepresented by numerous portions of a cranium with a fragment of a 

 pectoral ray discovered by Prof. B. F. Madge near the Solomon Eiver, 

 Kansas. The ray is of the compound character already described as 

 belonging to other genera of this family ; its edge is not preserved. 



The maxillary bones are snbtriangular in form, and support three or 

 four large lancet-shaped teeth at the middle of their length; there are 

 no teeth beyond them, but on the deeper side there are several small 

 lancet-shaped teeth ; the outer alveolar edge is rugose. The teeth are 

 very flat, acute, and perfectly smooth. The teeth on the greater part of 

 the dentary are intermediate in size between the large and small ones of 

 the maxillaries; they stand on the outer edge of a bioad horizontal alveo- 

 lar plane. There are three large teeth in a series at the end of the den- 

 tary on the outer side ; they have been lost, but their bases are broader 

 ovals than those of the maxillary bone. On the middle line of this part of 

 the dentary is a close series of small compressed teeth, with striate 

 enamel, standing on a ridge of the bone. They leave the last large tooth 

 to the outer side, while on the inner side stand two or three lancet-shaped 

 tusks of a short row further back. Posterior dentaries O'^'^.IO apart. 



Measurements. 



M. 



Length of maxilary bone above 0.0880 



Depth proximally 0300 



Length of crown of a large tooth 0150 



Width of crown at base 0065 



Length of hyomandibular 1000 



ifiobrara epoch of Phillips County, Kansas. Discovered by Prof. B. 

 P. Mudge. 



PACHYEHIZODUS, Agass. 



Dixon's Geology of Sussex, 1850, 374 ; Cope,]Proceed. Amer. Philos. Soc, 



1871, 344. 



PACHYEHIZODUS OANINUS, Cope, loc. cit, 344. 



Niobrara epoch of the Smoky Hill Eiver. 



Pachykhizodus kingii. Cope, loc. cit., 346. 

 Niobrara epoch of the Smoky Hill Eiver. 



PACHYEHIZODUS LATIMBNTUM, Cope, loc. cit., 346. 



Niobrara epoch of the Smoky Hill. 



- PACHYEHIZODUS LEPTOPSIS, sp nJV. 



Eepresented by portions of the right and left dentary bones, with 

 other portions of the cranium. The symphyseal part of the ramus is 

 not incurved, as in F. caninus and P. Icingii, but is obliquely truncate, 

 indicating that the chin had a compressed form, and was not rounded, 

 as in them. The lower portion of the bone is thin and laminiform 

 to a deep groove, which extends from the edge of the symphyseal face 

 along the inner side at one-third the depth of the ramus from the inner 

 bases of the roots of the teeth. The latter are thus supported on a 



