Cope.] it)4: [Dec. 16, 



Measurements. M. 



Depth of olecranon 0110 



Width of head of radius 0110 



neck of ilium anteroposteriorly 0120 



Diameter of shaft of tibia at middle 0085 



r anteroposterior 0180 



greatest 



of trochlea OUO 



Diameters of astragalus 



transverse. 

 [ < of head 0100 



Length of head 0070 



calcaneum 0300 



"Width of calcaneum at sustentaculum 0140 



cuboid facet 0066 



Length of cuboid 0120 



C (distal 0070 



Diameters anteroposterior \ ^^^^j^^j 0075 



' transverse proximal 0098 



f vertical 



I , S with tuberosity . .. .0100 



Diameters of navicular I transverse \ ^.,^^^, ,^^,J^^,^ 00,0 



^^ anteroposterior 



As already remarked, it is probable that the semigrooved trochlea of the 

 astragalus of this species is an indication that the genus Prototomus must 

 be retained as distinct from Stypolophus, to which the present species proba- 

 bly truly belongs. 



The specimen described, together with the mandibular ramus of another 

 supporting the last two molar teeth, were found in the bad lands of Wind 

 river, Wyoming, by J. L. Wortman. Dedicated to Frances Emily White 

 M. D., of Philadelphia. 



OXY^NA FORCIPATA Cope. 



Report Vert. Foss., New Mexico, 1874, p. 12. Report Capt. G. M. 

 Wheeler, U. S. G. G., Expl. Surv. W. of 100th Mer. iv, ii, p. 105, 1877. 



This formidable animal was abundant in Northern AVyoming, during the 

 Wasatch epoch. At least ten individuals are represented in the collection. 

 The following are the dimensions of the mandibles of the five best pre- 

 served. 



1 



Length of dental series |.103 



" premolar" j.042 



? .loo'.ioo 



045.044.051 



Depth of ramus at M. Ill 1.042 .039 1.037 .042 



5 



107 

 054 

 047 



The measurement .085 for the length of the premolars given in my 

 report to Capt. Wheeler, loc. cit., refers to the anterior three teeth, which 

 were originally supposed to be the only premolars. 



