552 THE WASATCH FAUNA. 



Measurements of astragalus. m. 



T^. . J. i < anteroposterior 080 



Diameters, greatest < ' noj 



( transverse "''' 



C vprf iofll - ..,-•••••••••■•■-•••••■•■•••- i\)*'' 



Diameters navicular facet ( „/,(, 



( transverse ""^ 



Diameters cuboid facet < f>t;i 



( transverse "^'■ 



Depth of fibular facet 02o 



Transverse width of anterior inner astragalar facet , "•^"2 



The calcaneum differs decidedly from that of Coryphodon max. While 

 its general dimensions are greater, the length is the same. The section of 

 the posterior extremity is a transvere parallelogram; in the C. anax it is 

 square. The sustentaculum has two facets, a superior narrower, and an 

 anterior; the C. anax has the anterior only. In the former the posterior 

 face of the sustentaculum rises to the posteinor edge of the facet; in the B. 

 jiachypus it has a superior surface, which is separated from the superior facet 

 by a groove. The cuboid facet is transverse and extends inwards, overlap- 

 ping the sustentacular; in C. anax it is very oblique, and does not reach the 

 sustentacular. The median inferior tuberosity of the distal extremity is 

 present in both species, as is the inferior marginal crest of the distal half of 

 the internal side. In both species this ridge shows two oblique grooves, 

 which perhaps accommodated the tendons of the tibialis posticus and flexor 

 digitormn muscles. In this order there is no groove of the cuboid bone to 



accommodate them. 



Measurements of calcaneum. ' m. 



Total length 1*''' 



c vertical - - ^^^ 



Diameter of free end < ^.c, 



( transverse "OJ- 



Width at sustentaculum 095 



Width of cuboid facet 049 



Greatest depth of facet 026 



The calcaneal and astragalar facets of the cuboid are about equal, and 

 make a strong angle with each other; the calcaneal is the more oblique to 

 the distal face. The distal extremity is subquadrate, the anterior three- 

 fifths being occupied by the two metatarsal facets, which are little distinct 

 from each other. The external is less than half as large as the internal. 



Measurements of cuboid. m. 



I vertical iu front 031 



Measurements < anteroposterior below 050 



( transverse below ' O.iO 



Length of a metopodial bone 080 



Diameters prosimally I ^^ eropos eiior 



( transverse "jo 



