404 University of California Publications in Geology [Vol. 12 



The series of distal portions of metapodials again illustrates the 

 considerable range of size among the Eden horses already noted in 

 the teeth. The degree of deflection of the distal trochlea away from 

 the axial line also varies, and on its part suggests the occurrence of 

 more than one Pliohippus form. The tibia and cannon bones are 

 those of an animal of light proportions, in this character more 

 resembling the deer than the present day horse. The unciform facet 

 of the third metacarpal and the cuboid facet of the third metatarsal 

 are well developed. 



Measurements of Limb Elements 



Tibia: No. 23478 



Greatest length of shaft 312 mm. 



Least diameter of shaft 2.5 



Metapodials: No. 23454 No. 23457 



Greatest length of shaft 215 (225) mm. 



Greatest diameter of prox- 



imal end 



(34) 



40 





Greatest diameter of distal 









end 



(35) 







Distal ends of metapodials: No 



. 23361 



No. 23356 



No. 23355 No.23357 



Greatest lateral diameter of 









trochlea 



41 



(37) 



33.5 mm. 31 mm. 



Greatest transverse diameter 









of trochlea 



33.5 



28 



27 (24) 



Greatest anteroposterior di- 









ameter of trochlea 



40 



37 



32 30 



Phalanx I: No. 23367 



No. 23366 





Greatest length 



65 







Greatest transverse diameter 









of proximal end 



36.6 



36 





Greatest transverse diameter 









of distal end 



30 







Phalanx 2: 







No. 23518 



Greatest length 







38 



Greatest transverse diameter 









of proximal end 







37.5 



The figures in parentheses are approximate. 



