76 



SCOTT — OX THE SELENODONT ARTIODACTYLS. [March 18, 



functional digits ; lateral metapodials less reduced than in Para- 

 meryx. 



Merycodesmus gracilis, sp. nov. 



Size small ; orbit small and bounded behind by very long 

 decurved postorbital process of frontal ; cranium relatively broad 

 and capacious ; mandible very slender. 



Measurements. 



Upper dentition, length I i to M 3 0.071 



premolar-molar series, length 054 



molar series, length. .- 022 



canine, ant. -post, diameter 006 



canine, transverse diameter 003 



M I, length 006 



M I, width 0085 



M 2, length 008 



M 2, width 010 



M 3, length 009 



M 3, width on 



Lower dentition, length I i to M 3 072 



'' premolar-molar series, length 058 



'' premolar series, length 032 



'^ molar series, length 026 



P I, length 0045 



P 2, length 0055 



P 3, length 007 



P 4, length 0065 



M I, length 0065 



M 2, length oo75 



M 3, length on 



(N. B. — The apparently great length of the premolar series is due 

 to the diastema behind pi) 



The dentition of Aferycodesmus is quite similar to that of Para- 

 meryXy but differs in certain very significant ways. Thus, the 

 lower incisors have more chisel-shaped crowns, and the lower canine 

 has become one of them in form and function ; the upper canine is 

 much larger and the first lower premolar has taken on the form and 

 function of the canine. In each jaw a long diastema separates p i 



