HTEACOTHERIUM. 645 



Measurements of posterior leg. 



Xength of femur below middle of third trochanter 088 



Widthoffemnrat head 032 



Anteroposterior diameter of head 009 



Width of rotular groove at middle 009 



Expanse of condyles 021 



Length of patella 015 



Width of patella Oil 



Thickness of patella 008 



Length of tibia 1"22 



Proximal diameter of tibial '*"t"°P°«*«"°^ ^"^ 



c transverse V'io 



_. . r \. C4. t. -jji < anteroposterior 009 



Diameters of shaft at middle I ' ^„„ 



( transverse UUa 



Diameters distal end of tibial '^"t'^^-'I^'^t'^"''' ^J^ 



( transverse 016 



The greater part of the posterior foot is preserved, the middles of the 

 shafts of the metatarsals, and some of the phalanges being Avanting. The 

 trochlea of the astragalus is narrower and less oblique than in Hyrachyus 

 ■eximius. The ligamentous fossa of its external side is bounded by a vertical 

 ridge in front ; the internal fossa is round, except where it runs downwards 

 and forwards to the inferior side of the bone. The internal tuberosity of 

 the head is insignificant. The calcaneum is not wide at the sustentaculum, 

 and has no distal transverse processes. Its posterior distal extremity is sub- 

 round. The calcaneum is a good deal like that of Hyrachyus eximius. The 

 contact of the ectocuneiform and navicular is somewhat serrate, perhaps as 

 the result of an injury. The proximal extremity of the navicular is mod- 

 erately concave, and there is no tuberosity behind the astragalar facet. The 

 latter has no marginal notch or fossa. As the mesocuneifomi is shorter than 

 the ectocuneiform, the second metatarsal commences a little proximad to the 

 others. Its shaft, as well as that of the fourth metatarsal, is absolutely lat- 

 eral to the median one. The second is narrower than the fourth, but of the 

 same depth. The section of the third is proximally a triangle with convex 

 base and truncate apex. Distally th'^ section of the shaft is a flat trans- 

 -verse oval. The transverse fossa proximad to the condyle is sharply defined 

 at both proximal and distal borders. About half of the distal condyle of 

 each lateral metatarsal is produced ; it is beveled so that its ectad edge is 

 the more prominent, representing the keel of the median metatarsal. The 

 ■contracted portion narrows forwards and holds a sesamoid bone. The prox- 



