674 THE BRIDGER EPOCH. 



swollen external face. (6) The pisiform is small and convex, instead of 

 being larger and flat. 



The metacarpals (1) are absolutely and relatively smaller. (2) The 

 inner (II) has a more oblique phalangeal articulation, which is short above 

 and with the keel prolonged upward, instead of being as in T. roulini, 

 distal only. 



The pelvis is distinguished by the much longer plate of the ilium whose 

 extremity constitutes the crest. (1) The crest is also shorter, and more 

 anterior. In T. roulini this plate does not so much exceed the sacral plate 

 in length. (2) The pubes and ilia are not so horizontal, but meet at nearly 

 a right angle, and (3) the ischiopubic common suture is considerably longer. 

 (4) The obturator foramen is a more elongate oval. 



The femur is very similar to that of T. roulini, being no smaller in rel- 

 ative size. (1) The great trochanter is wider fore and aft, and with margin 

 more continued on the anterior aspect of the extremity of the shaft. (2) 

 The third trochanter is neai-er the middle of the length. (3) The condylar 

 surfaces are continuous with the rotular, not isolated as in T. roulini. The 

 latter also (4) lacks the two fossse on the outer margin of the external seen 

 in H. eximius. (5) The rotular groove is also narrower in the latter and not 

 so deeply excavated as in T. roulini. 



The tibia is (1) reduced in size, and especially contracted distally; the 

 relative widths of the ends are 6 cm : 3.5 ; in T. roulini 7.5 cm to 5. (2) 

 The crest is more prominent and is deeply fissured by a groove, which is rep- 

 resented by a shallow concavity in T. roulini. The groove (3) external to 

 this is deeper. (4) The posterior inner tuberosity of the distal end is more 

 median, hence the inner trochlear groove is further removed from the ante- 

 rior inner malleolus, which has, therefore, a greater inner (not outer) extent. 



The tarsus (1) is generally longer and narrower, except in the case of 

 the cuboid bone (2), which is shorter than in T. roulini. (3) The astragalus 

 has a narrower neck, which, therefore, appears more on the inner side. (4) 

 The facet for the cuboid is smaller. The inner tuberosity of the head is 

 more prominent. (6) The calcaneum is more slender, with larger cuboid 

 facet, especially posteriorly. The metatarsus is absolutelj^ nearly as long as 

 in T. roulini, and, therefore, relatively longer and more slender. (2) The 



