Geology and Natural History. 239 
Rhinoceros, The premolars had two or three lobes with cres- 
centic section arranged transversely. He regarded the genus as 
of the most marked of these was the genus Hipposyus, described 
by Dr. Leidy, 
9. On some New Species of Fossil Mammalia from Wyoming; 
by Dr. Jos. Lerpy. (From a letter to Mr. Tryon, dated Fort 
Bridger, J uly 24th, printed in advance of the Proceedings of the 
Academy of Natural Sciences of Philadelphia, and issued Aug. 
se 
often with abundance of fresh-water shells, also pa oceur. 
There are often isolated lands surrounded by broad plains or 
As the buttes crumble away under the effect of the weather, the 
fossils of their strata become exposed to view. 
On the 17th, in company with Dr. J. Van A. Carter and Dr. 
Joseph K. Corson, U.S.A., I made a trip to the valley of Dry 
Cree » forty miles from Fort Bridger. Here we encamped, a 
a three days in exploring the neighboring buttes for fossils. 
Most abundant vertebrate remains are e of 
shells of which are frequently met with in little heaps of fragments 
m 
se of the tapir-like animal which I have named Pak h 
Paludosus, We also found a number of more characteristic speci- 
mens than I had before seen of the larger species of Palwosyops 
djor. Dr. Corson further discovered the remains of a small 
Species which may be named PaLs®osyors HUMILIS. An upper 
