THE MAMMALIA OF IIIK UINI'A KORMATIOX. 



551 



foot, which is hiijhl y " modernized.'" The relations of these genera to the European 

 forms is somewhat nncertain, so that the following observations apjjly especially to 

 the above American jronera. 



yimynod- 



Aenilh"- 



J/i/wi 



/- 



i '/> 



DiAO. 13.— The astrag.ilar and calcaneal facets in Amyaodon, Aeernlhtrium and Aplielops. All species indcler- 

 minate. 



A. — AcEiJATUEUiUM (Coll. Mus. Comp. Zoil,). The general characteristics of 

 the feet arc lateral compression and vertical elongation of the carpal ;iml tarsal ele- 

 ments and the elongate character of the metapodials. The caiyus shows the same 

 degree of lateral displacement seen in the tapir. The scai)hoid is subqnadrate, 

 resting by a broad and slightly oblique facet upon the trapezoid. The lunar has a 

 broad unciform facet, but retains a small horizontal ficet u|)on the uncilbrm. The 

 cuneiform extends widely backwards. In the second row, the trapezoid supports mc. 

 II ; the magnum is a stout bone, subqiuidrate anteriorlv, projecting beneath the lunar 

 posteriorly with the incipient stout pivotal peg, which is so largely developed in 

 Aj)hdops. The third metacarpal is less enlarged lli.in in Ap/iclupa ; the second and 



