102 M. R. Thorpe — John Day Eporeodons 



skull smaller and about 20 mm. shorter in total length (this 

 difference is not due to age, as the holotype is fully adult) ; 

 very short sagittal crest ; tooth-row shorter, individually 

 and totally; muzzle more depressed and highest part of 

 skull above postorbital bridge; postorbital constriction 



/2425, TYPE 

 Y. P. M. 



Fig. 4. — Eporeodon trigonoceplialus parvus, subsp. nov. Holotype. Left 

 lateral view. " X 1/2- 



of greater diameter ; bullae large and triangular ; anterior 

 portion of bullae extends forward as far as middle of 

 glenoid articulation; paroccipitals extend outward; M- 

 is square instead of being wider than long. 



The type locality of E. trigonocephalus is the North 

 Fork of the John Day River, and the subspecies is 

 probably the basin representative. However, the new 

 form is middle John Day, and the other, upper. 



1242^, TYPE 

 Y. P. M. 



Fig. 5.— Eporeodon trigonocephalus parvus, subsp. nov. Holotype. Left 

 half, superior view. X l/2« 



The paratype of the subspecies, found at Turtle Cove 



