446 



MEMOIRS OF THE CARNEGIE MUSEUM. 



the sides of Mc III to which bone they he rather close with comparatively little 

 divergence distally. All the phalanges are broad, short, and depressed. (See 

 PI. LXIII). 



In Coenopus tridactylus the metacarpals also are close to one another, but 

 the lateral metacarpals are heavier in proportion than in D. cooki. This is also 

 true of the bones in the hind foot. Another noticeable feature of the hind foot in 

 C. tridactylus is seen in the proportionally larger size of the entocuneiform, which is 

 not remarkable, when we consider the differences in size of the lateral metapodials 

 in the two genera here compared. 



Hind Limb. 



The pelvis is short and broad. The area for the gluteal muscle is broadly 

 expanded, but the supra-iliac border is emarginated as in Coenopus of the Oli- 



Fio. .34. Diceratherium cooki Peterson. No. 2797, Coll. Carnegie Museum. Left half of pelvis, dorsal 



view. X h 



gocene. The ischium and pubis are relatively short when compared with Coenopus 

 tridactylus, indicating quite an advance in the direction of the recent Rhinoceroses. 



