COEYPHODON. 543 



for the flexor tendons of the foot and digits. The patella is flat, and does 

 not exhibit the distal prolongation seen in some specimens; e. g., the one 

 flgured in my report to Captain Wheeler, Vol. IV of his general report, 

 Plate LVIII, fig. 4. The proximal end of the fibula is unusually large; it 

 has a nearly quadrangular section, and the tibial facet covers about half 

 the oblique proximal face. The calcaneum is quite robust. It presents the 

 usual characters. The cuboid facet is small and more than usually oblique 

 inwards. A tuberosity continues the inferior face between this facet and 

 the base of the sustentaculum, and is separated from the former by a fossa. 

 The sustentaculum is narrow, and its astragalar facet oblique downwards 

 and forwards. The external astragalar facet is flat; external to it a large 

 smooth surface receives the extremity of the fibula. Below this is a deep 

 longitudinal fossa, and below this a strong horizontal crest, which extends 

 to the cuboid facet distally and to the middle of the heel posteriorly. The 

 posterior extremity of the calcaneum has a nearly quadrate outline. 



Measurements of posterior foot. m. 



Length of tibia on front to spine 300 



Widtli of head 105 



Anteroposterior diameter external cotylus 075 



Anteroposterior diameter internal eotylus 053 



Least diameter of shaft 042 



Diameters distal end tibia < " 



( transverse 084 



Length of patella 094 



Transverse width head of fibula 052 



Length of calcaneum , 106 



Width calcaneum at sustentaculum .081 



Width calcaneum at free extremity 048 



Depth calcaneum at free extremity 042 



Depth calcaneum external facet 045 



Depth calcaneum cuboid facet 029 



Width of cuboid facet 037 



Not having an astragalus or posterior foot of the C. anax, it is not yet 

 possible for me to state whether this species is a Bathmodon or a true Cory- 

 phodon. The large Bathmodon pacliypus is distinguished from the G. anax 

 by various characters which are mentioned under the head of that species. 



The Coryphodon anax has been only found so far, in the Wasatch beds 

 of the Big-Horn Basin of Wyoming. J. L. Wortman discovered it. 



It was originally described in the Paleontological Bulletin No. 34, p. 

 168, and is figured in the present work in Plates XLIVa, figs. 7-12; 

 XLIV6; XLIVe, fig. 6; XLIV/ 



