OF THE WHITE IMVEK BEDS OF MONTANA. 247 



the anterior ridge prominent. On the inside of the mandible a convexity runs forward, 

 dying out in a narrow ridge on the alveolar herder under M-. r . 



The great trochanter of the lemur is not high. The lesser one is prominent pos- 

 terior to and a little below the head. The third trochanter is small. The middle part of 

 the shaft is nearly circular in section. 



Measurements. 

 Upper Jaw. 

 Length of last two premolars anil the true molars 



M. 



0137 



Length of molar series 006S 



Length of P* 0034 



Width of Pi 0023 



Height of crown of P& 003 



T ,, „„, 0031 



Lenth of P 1 



Width of Pi ° 033 



Length of Mi ° 03 



Width of Mi ° 04 



, , A . m 0026 



Length of M 1 



Width of HP °°* 



Lengtli of M4 ° 016 



Width of Mi ° 031 



Lowbb Jaw. 



012 

 Length of molar series and last premolar 



r * , . . 0085 



Length of molar series 



, tl fP 0035 



Length oi It 



, , * 0028 



Length of M , 



0021 

 Width of M T 



Height of M T 



Length of Mr,- 



T ., * 0025 



Lengtli of M 3 



001 Q 

 Width of Mj 



„.,,.,, 0024 



Height of Mj 



Depth of ramus under M T 



Depth of ramus under M, 



From posterior of M T to posterior of condyle 01 S 



. ,, ,,. 046 



Length oi femur 



Sleneofiber hesperus, sp. nov. 

 Part of the left horizontal ramus of a mandible (No. 41) containing all the teeth. The 

 tip of the incisor is gone. The specimen was found in a light colored sandy clay near 

 1 Jlacktail Deer creek, about thirty miles above Dillon in Beaverhead county. It was near 

 the top of an exposure in which, a considerable disiance below, were the remains of 

 Arretotherium, to be described later, and part of the skull of a quite large rhinoceros. 



