THE OSTEOLOGY OF ELOTHERIUM. 319 



The phalanges of the pes differ from those of the manus principally in their greater 

 slenderness. The first phalanx is a little longer than that of the fore-foot, and decidedly 

 more slender ; the proximal trochlea is less deeply concave and the groove for the carina 

 narrower and deeper. The second phalanx is of nearly the same length as in the fore- 

 foot, hut is much narrower and somewhat less asymmetrical in form. As Kowalevsky 

 points out, the proportions of this phalanx are very exceptional among ungulates. The 

 ungual is smaller in every dimension than that of the manus and, in particular, is nar- 

 rower. Apparently, Anthracotherium (Kowalevsky, '73, Taf. XI, Figs. 52, 53) displays 

 the same difference between the phalanges of the j>es and those of the manus as does 

 Elotherium. In Sus and Hippopotamus, the phalanges of the two extremities differ very 

 little. 



3Ieasurements. 



Astragalus, length 0.083 



Astragalus, width proximal trochlea 045 



Navicular, height 024 



Navicular, width 029 



Navicular, thickness 044 



Entocuneiform, height 037 



Entocuneif orm, wid th 014 



Mesocuneiform, height .016 



Ectocuneiform, height , 022 



Ectocuneiform, width 025 



Cuboid, height 045 



Cuboid, width 038 



Cuboid, thickness. 047 



Metatarsal iii, length -. 181 



Metatarsal iii, width proximal end 029 



Metatarsal iii, width distal end 032 



Metatarsal iii, thickness proximal end 041 



Metatarsal iv, length 181 



Metatarsal iv, width proximal end.. 033 



Metatarsal iv, width distal end 031 



Metatarsal iv, thickness proximal end 046 



Proximal phalanx, length . 060 



Proximal phalanx, width proximal end .032 



Proximal phalanx, width distal end 027 



Second phalanx, length 042 



Second phalanx, width proximal end .030 



Second phalanx, width distal end 024 



Ungual phalanx, length 032 



Ungual phalanx, width proximal end 022 



A. P. S. — VOL. XIX. 2 O. 



