MESODONTA. 223 



M. 



Length of crown of second molar 006 



Width of crowu of second molar 0045 



Width between two second molars 014 



Width between canines 005 



Width of ascending ramus above dental foramen 016 



Length of humerus 083 



Diameter of head 013 



Diameter of shaft at middle 0085 



Diameter of distal end, transverse 023 



Diameter of distal end, antero-posterior 0078 



Depth of olecranon 009 



Depth of ulna at corouoid 010 



Diameter extremity of radius, proximally 009 



Diameter extremity of radius, distally 010 



Length of ilium from acetabulum 042 



Width near crest 017 



Length of femur preserved 137 



Width just below neck 017 



Width at middle Oil 



Width at extremity 019 



Width of trochlea 009 



Longest chord of condyles and trochlea 019 



The following points may be gained by comparison with the skeleton 

 of Lemur collaris (catalogue Verreaux). There is considerable resemblance 

 in the details of structure of the molars from the third to the sixth, inclusive. 

 Of course the anterior teeth differ widely in the two, and the last true molar 

 of the Lemur has no heel. The principal difference in the humeri is seen 

 in the superior size of the epicondyles of the T. rostratum, and the rather 

 more robust character of the shaft. The proximal half of the ulna is 

 deeper, and the olecranon is not so wide in T. rostratum. The proximal 

 part of the radius is very similar in the two species, but the distal extremity 

 is in the T. rostratum less transversely extended, and thicker anteroposte- 

 riorly. There is also much similarity in the ilia. The crest is more extensive 

 in T. rostratum, and the inferior border is thinner at its proximal part. 

 Towards the acetabulum the increase in width of this border is similar, and 

 the anterior inferior spine is as prominent. The resemblance between the 

 femora amounts to identity of character; that of the T. rostratum is more 

 robust 



The remains of this species were found together by the writer in the 

 Bridger beds in an isolated spot on Black's Fork, Wyoming. 



Professor Marsh states (loc. cit.) that this species is the one he named 

 Limnotherium affine in a paper in the American Journal of Science and Arts, 



