554 



TUB MAMMALIA OF THE UINTA FORMATION. 



type is in the slightly increased massiveness, which might well represent individual 

 variation. 



The metapodials of a right manus of Diplacodon are well preserved ; they are 

 long, relatively slender, and spreading, interlocking closely proximally and keeled 

 upon the posterior distal faces. 



Titanotlierium (Coll. Mus. Comp. Zool. of Cambridge). The growth of the lunar 

 and magnum are the distinctive features of this cai'pus. The lunar presents two 

 distal subequal facets for the magnum and unciform respectively. The c u n e i f o r m 

 is relatively somewhat reduced, while the scaphoid is enlarged and rests by two 

 nearly horizontal facets upon the trapezoid and magnum. 



Blb£OS.- 



Biji/di 



Tltanoth'. 



DiAO. 13. — Tlie astrngalar and calcantnl facets in the Pala-osyops TilanoUifciuim series. Falceosijoiis major, Prince- 

 ton collection ; Diplncodoii ? elatus, Princeton collection ; Titanotli,erium (sp. indct.), Princeton collection. 



Tarsus. The sjieclal characteristics of the tarsus, in addition to those above 

 mentioned, are the wider separation of the three astragalo-calcaneal facets and reduc- 

 tion of the inferior facet ; the astragalo-cuboid facet is an elongated triangle, broad 

 in front, narrowing posteriorly ; the astragalar trochlea extends backwards upon the 



