110 



M. R, Thorpe — John Bay Eporeodons 



infraorbital foramen above posterior portion of P^, this 

 foramen double, with a smaller one above and in advance 

 of the larger. Both sides possess this double foramen, 

 but it is possibly due to individual variation. 



Fig. 15 



f24/^ TYPE 

 V P M. 



Fig. 16 



/24/^, TYPE 

 Y. P. M. 



Fig. 15. — Paroreodon marslii, gen. et sp. nov. Holotype. Eight half, 

 palatal view. X 2/3. 



Fig. 16. — Paroreodon marslii, gen. et sp. nov. Holotype. Eight half, 

 superior view. X 2/3. 



Measurements of Holotype. 



mm. 



Axial length, basion to prosthion 141.2 



Superior molar series, length 38 



Superior premolar series, length 33 



Cranium, max. width 57.3 



Diameter, postorbital constriction 43 



Bulla, ant.-post. diameter 23.3 



Transverse diameter 21 



Vertical diameter 24 



Eeferences. 



Cope, E. D. — 1880. — Observations on the faunae of the marine Tertiaries of 

 Oregon. Bull. U. S. Geol. and Geog. Surv. Terr., vol. 5, 55-69. 



— 1884. — A. Synopsis of the species of the Oreodontidse. Proc. Amer. 

 Philos. Soc, 21, 503-572. 



