646 THE WASATCH FAUNA. 



imal phalanges are not elongate. The distal legamentous fossae are perfectly 



defined. The lateral phalanges are but little shorter than the median, and 



were evidently used in progression. They are rather narrower and deeper 



than the median. 



Measurements of posterior foot. 



M. 



Length of calcaneiiru - 036 



Deptli of free extremity (vertical) 009 



Width at sustentaculum; 0125 



Length of astragalus on inner side 017 



/ . , • (external 013 



\ anteroposterior.; 



Diameters of trochlear < median 010 



' transverse 008 



Transverse diameter of head 010 



) proximal < ' 



longitudinal 010 



mteroposterior 009 



ransverse 0073 



( longitudinal 005 



Diameters of n.avicularj j,j.p^i„j,j] < anteroposterior 010 



^ i transverse 0065 



Length of eetocnneiform 006 



Width of ectocuneiform 008 



Length of mesocuneiform 0040 



Width of mesocuneiform 0055 



Length of entocuneiform 0085 



Width of entocuneiform 0070 



terior 0090 



-....„„...„ 0036 



Diameters second metatarsal i , , . . ^mn 



anteroposterior UU7U 



V^ < transverse 0060 



Diameters third metatarsal ■( 



f proximal ^'*"**''°P''***'™ 

 I ( transverse . . . 



] distal \ ■ 

 I < 

 J . ,< anteroposterior 0090 



!P'^°^""'^^hransverse 0070 



distal coudvle 



<, anteroposterior 00C5 



L ■ (transverse UU7& 



C c anteroposterior 0075 



I P''0^»°"^^ I transverse 0062 



Diameters fourth metatarsal ^ , . * ■ _ nnrn 



1 distal ""♦•'^"P^^tenor 00.0 



^ ( transverse UUoU 



r longitudinal OHO 



Diameters second proximal phalange < ^joximal^ vertical 066 



( < transverse 006 



/ longitudinal 012 



Diameters third proximal phalanges^ proximal \ ^^'■''''^*1 ^""^ 



( < transverse 00s 



Oenn'th ^^^ 



Diameters second median phalange ; " nnc 



/width 005 



Oen"th 006 



Diameters third median phalange t " , ,,,,j 



< width 008 



The specimen above described is the most complete representative of 

 the genus Hyracotherium that has ever been discovered. I owe it to my 

 assistant, J. L. Wortman, who found it in the bad lands of the Wind River, 



