1884.] 557 (Cope. 
Measurements. M. 
; VOTUCHL Fess ertiet yak Coe OLE 
Diameter external nares f 
Utransverse above... ...... .017 
anteroposterior. . .0380 
Diameter of a facial vacuity t ‘ 
Utranverse...... 018 
‘ : BYONOSUELION vised vis veiyess uns ORe 
Diameter of orbit 3 ant oe 
VEL UCC Wisig) view lees SOMES Ronen antes ee 
{ anteroposterior..... .058 
tYANSVETSC...s+.ee0e -O26 
( VEPHCHL iecveseccuensn cudeo 
Diameter of zygomatic foramen 
Diameter of foramen magnum 
VAPAMAVEPSO. Cices ves wu 
BE LIGAL kasi de as OUD. 
Digamoter of meatus auditorius ; § vertical . : 
‘ anteroposterior. .....+. O11 
VOLULOBIN verses SEG EM SES CAV ag [93 
Diameter of otic bulla + anteroposterior. ......eeeeeee+ 025 
| tHANBVETEC. 60s sseieevcersevtes Ue 
Width: BOUWSEN CANINS TOGED ys des vise es cree s cewns ee S00 
“ 6 
last true molars » .0285 
Length of dental series... 065 
hi true molar series. . 08: 
ie Premtolar ys Vb. Ne PUNT FAS sir ee vals seo .0254 
DikmetersPanci» anteroposterior....... VACA alie de WOD0E 
a TYANSVETHO. Vink Ge vw es Deven otvdiats wit OU U 
Diatnelere Pee dy ( ANtETOPORTELIOP 1. cess ee. Emons EAU 
UVABEVOISG IG ch veic’ civavatwi mene nUUG 
Tle eteon tay § anteroposterior,....... Oe ROW OUND 
CATAMEVODSG Wiiaes cevuvwernueuaa ee ie ie OLD 
§ anteroposterior. .... oie ei wae Ns) ode ily 
Diameters m. iii 
¢ transverse (with extertial tobe wash 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 Oreodontide. 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 coés- 
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 
