TRANSACTIONS OF WAGNER 



44 



^^ RHINOCEROS 



These evidently do not belong to R- longipcs of Leidy, from the fact that 

 this species more nearly resembles R. unicornis in build, and the distal end of 

 the ulna should be wider than these specimens. 



Radius. — There are no characters by which the radii of proterus (of which 

 we have four complete examples) and fossiger can be separated, both being 

 short, massive, and considerably dilated at either extremity. The larger of 

 the two radii, whose measurements are given below, is figured on plate xiv. fig. 

 7, and was ascribed with a query to R. longipes by Dr. Leidy. For reasons 

 given under the description of that species, it probably belongs to the species 

 under consideration. 



Proterus, Fossiger. 



Length .... .270 mm. .212 mm. .290 mm. .250 mm. 

 Proximal width ... .88 " .85 " .98 " .85 

 Distal width 93 " -83 " .102 " .83 



Femur.— The femur is represented by the proximal portion of two speci- 

 mens, the distal ends of five, and the median part of the shaft of one. Its 

 length, as indicated by these fragments, was about the same as that oi fossiger, 

 or about 40 to 42 cm. The great trochanter is low and wide, the lesser tro- 

 chanter is represented by a ridge, while the third trochanter is very small in 

 one specimen and large in another, although by no means like the third tro- 

 chanter of R. unicornis. In a specimen of fossiger lacking the proximal 

 epiphysis, the third trochanter is practically obsolete. The fragments indicate 

 that the inner, upper portion of the shaft was thinner in proterus than \\\ fossiger, 

 but this may be an individual peculiarity of the bones of one or the other of 

 the specimens. The distal portions of the femora are like the other bones, 

 very variable. 



Their measurements are as follows: 



Greatest width .... 

 Greatest width of articular surface 

 Greatest antero-posterior width . 



