with Descriptions of New Genera and Species. 97 



^duals, cliieflyfrom Turtle Cove, Haystack Valley, and 

 Bridge Creek. The species is abundant in the middle 

 John Day. 



Fig 2 



Fig 3 



/0/42, TYPE 

 Y. P. M. 



Fig. 2. — Eporeodon occidentalis (Marsh). Holotype. Eight half, pala- 

 tal view. X 3/5. 



Fig. 3. — Eporeodon occidentalis (Marsh). Holotype. Eight half, supe- 

 rior view. X 3/o. 



Measurements. 



Holotype Plesiotype 



mm. mm. 



■ Total skull length 188* 192 



Bizygomatic diameter 127* 136 



Superior molar series, length 43 44 



Superior premolar series, length 39.5 39.5 



Diameter, postorbital constriction 41 37 



* Approximate. 



Eporeodon leptacanthus lept acanthus (Cope) 1884. 



Holotype, No. 7695, Cope Coll., A. M. N. H. Upper Oligoceue (middle 

 John Day), John Day Elver, Oregon. 



Specific characters. — Skull large and dolichocephalic; 

 paroccipital process strongly compressed; nasal bones 



