1884.] 557 [Cope 



Measurements. M. 



t.. , , [vertical 014 



Diameter external nares^ , __ 



l transverse above 017 



-r.. , e c • i v f anteroposterior 030 



Diameter of a facial vacuity i nAn 



<■ tranverse 013 



Diameter of orbit \ anteroposterior 023 



t vertical 019 



t.. ,. c /anteroposterior 053 



Diameter of zygomatic foramen < r 



t. transverse . . 026 



vertical 0095 



Diameter of meatus auditorius 



Diameters m. i 



r 



Diameter of foramen magnum < 



•-transverse 013 



vertical 009 



anteroposterior 011 



f vertical 025 



Diameter of otic bulla J anteroposterior 025 



I transverse 022 



Width between canine teeth 008 



" last true molars 0285 



Length of dental series, 065 



" true molar series 0343 



" premolar 0254 



DiametersP-m.iiS antero P° sterior 0056 



' transverse 0050 



Diameters P-m. iv \ anteroposterior 0070 



(. transverse 0080 



anteroposterior 0075 



transverse 0110 



Diameters m. iii 5 anteroposterior 017 



' transverse (with external rib) 012 



The only specimen of this remarkable' species known to me was found 

 in the valley of Deep river, Montana, by my assistant, Mr. J. C. Isaac. 

 The wear of the true molars shows that the animal was of full age, though 

 not old. 



PITHECISTES Cope. 



Proceedings American Philosophical Society, 1877, p. 219. 



This genus represents the final term in the decadence of the once 

 powerful and numerous family of the Oreodontidse. It is unfortu- 

 nately established on a mandibular ramus only, and although some 

 maxillary bones are referred to it with much probability, they are not 

 preserved in such a way as to demonstrate the presence of the large 

 nasal sinuses characteristic of Leptauchenia. I, however, suspect that 

 they occur. The genus further resembles Leptauchenia in the coos- 

 sification of the mandibular rami, and the reduction in number of the in- 

 cisor teeth. In P. brevifacies there is but one inferior incisor tooth on each 

 side. As reduction in the superior incisors usually precedes reduction in 



