572 University of California Publications in Geology [ y o L - H 



Figs. 203a to 203d. Hipparion or Pliohippus, sp. Third metatarsal, no. 21198, 

 X %. Fig. 203a, anterior view of proximal end; fig. 203&, articular facets of 

 proximal end ; fig. 203c, anterior view of distal half ; fig. 203d, posterior view of 

 distal half. Ricardo Pliocene, Mohave Desert, California. 



Figs. 204 and 205. Pliohippus or Hipparion, sp. Second and fourth meta- 

 tarsals, lateral views, X %. Fig. 204, metatarsal IV, no. 21475; fig. 205, meta- 

 tarsal 2, no. 21479. Ricardo Pliocene, Mohave Desert, California. 



See legend for figures 206 to 210, foot of page 573. 



