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University of California Publications in Geology [Vol. 9 



structure and proportions of the parts of the extremities preserved 

 are near those of Hypohippus. The lateral digits and their ungual 

 phalanges are relatively large, and were evidently functional. The 

 first and second phalanges of the median digit are relatively shorter 



L' - ' 19b 19a 



Figs. 19a and 19b. Hypohippus (Drymohippus) nevadensis Merriam, no. 

 21056 X %. Cedar Mountain beds, Nevada. 



Figs. 19a, anterior limb; 19b, posterior limb. 



and wider than in the Merychippus forms of the Miocene. The ungual 

 phalanx of the median digit is broad, and the lateral wings show a 

 stage of development at least as advanced as in Hypohippus. Meta- 

 carpal three shows a distinctly oblique lateral facet for articulation 



