194 



osborn: OLIGOCENE, MIOCENE, PLIOCENE EQTJID.E. 



numerous plications; (6) a pli caballin; (7) six or more short folds on either side of the metaloph, numerous folds also 

 from the protoloph. (8) In dimensions and general form resembling H. richthofeni of China and 77. gradle of Europe, 

 lower cheek teeth also resembling those of 77. richthofeni. 



Hipparion mohavense callodonte Merriam 1915. 

 Text Fig. 158. 



Hipparion mohavense callodonte n. var., Merriam, John C. "New Horses from the Miocene and Pliocene of California," Univ. 

 Cal. Publ. Bull. Dept. Geol, Vol. 9, No. 4, Nov. 22, 1915, pp. 5-4-55, figs. 5-7. 



Horizon and locality. — Ricardo Pliocene, near Ricardo postoffice on the western border of the Mohave Desert, Cali- 

 fornia. Type collected by Emerson M. Butterworth. 



Type. — Univ. Cal. Pal. Coll. 21311. (Merriam) "A finely preserved dentition including the upper and lower 

 cheek-teeth with several of the incisors." 



Fig. 157. Original figures of the type molars of Hipparion (?) mohavense Merriam, Univ. Cal. Pal. Coll. 19787. Figs. 

 la, lb, occlusal and outer views of m 2 ; figs. 2a, 2b, occlusal and outer views of m 1 ; figs. 3a, 3b, occlusal and outer views 

 of p 3 . Natural size. After Merriam 1913, p. 437. 



Measurements or No. 21311. 



P 2 , anteroposterior diameter 29.9 mm. P2, 



P 2 , transverse diameter 20.2 P 2 , 



P 3 , anteroposterior diameter 27.4 P3, 



P 3 , transverse diameter 23.2 P 3 , 



P 4 , anteroposterior diameter 24.8 P4, 



P 4 , transverse diameter 21.5 P 4 , 



P 4 , height of mesostyle ' 45.5 P4, 



M 1 , anteroposterior diameter 24.5 Mi, 



M 1 , transverse diameter 22.6 Mi, 



M 2 , anteroposterior diameter 24. M2, 



M 2 , transverse diameter 20.4 M 2 , 



M 2 , height of mesostyle 41. M 2) 



M 3 , anteroposterior diameter 21. M 3 , 



M 3 , transverse diameter 18. Ms, 



anteroposterior diameter 28.4 mm. 



greatest transverse diameter 12. 



anteroposterior diameter 27. 



greatest transverse diameter 13.7 



anteroposterior diameter 27.4 



greatest transverse diameter 13. 



height of protoconid 51. 



anteroposterior diameter 25.8 



greatest transverse diameter 11.4 



anteroposterior diameter 27.3 



greatest transverse diameter 10.8 



height of protoconid 44.4 



anteroposterior diameter 25. 



greatest transverse diameter 10.4 



