PLATE 42 



FORE AND HIND FOOT OF MERYCHIPPUS ISONESUS COPE. 

 All figures one-half natural size. 



Mascall, John Middle Miocene 1. Mesohippus isonesus Cope, topotype, Am. Mus. 8174a. Associated with limb 

 Day Basin, and foot bones. Metacarpus and proximal phalanx, a, Anterior view, b, in- 



Ore. internal view. 



2. Merychippus isonesus Cope, type, Am. Mus. 8175. Associated with skull, pelvis, 

 and hind limbs. Hind foot, a, anterior, b, internal, c, external view. 



306 



