724 THE EOCENE FAUNA. 



Measurements. 



K. 



/ longitudinal 0.007O 



Diameters ceutrnm lumbar vertebrae vertical wZi 



(transverse 0060 



I anterior 0054 



Diameters of neck of ilium } exterior 0O7O 



( interior ^^ 



Vertical diameter of acetabulum 00/0 



Width of proximal end of femur *'137 



Diameter of head of femur 006O 



Diameter of shaft of femur (transverse) 0065 



Width of rotular groove of femur 0045 



Width of tibia behind distally - 0054 



Distal width of fibula 0045 



Length of astragalus 0102 



Width of trochlea behind 0048 



(length 0070 



Diameters of cuboid I . f , ' ' " ' '." ' ' nnjfv 



I width of middle 0040 



From the Wasatch formation of the Big Horn River, Wyoming. J. L. 



Wortman. 



Pantolestes etsagicus Cope. 



Mioclcenus etsagicus Cope. Paleontological Bulletin No. 34, p. 189. 

 Plate XXV e, fig. 21. 



This, the largest species of the genus, is represented by the two rami 

 of a mandible of an adult animal in good preservation. In their robust 

 character the premolar teeth resemble those of Mioclaenus turgidus, but are 

 not relatively so large, nor is the last true molar relatively so small, as in that 

 species. The heel of the third premolar is obsolete, and that of the fourth 

 is a wide cingulum. Neither exhibits an anterior basal tubercle, and in both 

 the principal cusp is stout. The true molars widen posteriorly to the anterior 

 part of the last molar. The latter contracts rapidly to a narrow heel. The 

 tubercles are all subconic, and the median o-nes of the last molar are small. 

 There are no cingula, and the enamel is smooth. 



The ramus is not robust, and is of moderate depth. Its inferior border 



rises below the middle of the last molar tooth, and posteriorly. There is a 



" mental " foramen below the contact of the fourth premolar and first true 



molar. 



Meastirements. 



M. 



Length of bases of six posterior molars 0.047 



Length of bases of three premolars 024 



Length of bases of Pm. ii 009 



Length of bases of Pm. iv 008 



