248 An American Species of Paleotherium. 
square, was observed with the bones, leading to the conclusion 
that they were taken up from the altars, in the adjacent larger 
mounds, and afterwards finally deposited here. 
General Observations. —Whether these classes are maintained 
throughout the West, is a question which a systematic examina- 
tion, carried on over a wide field, alone can determine. In al- 
hearths. 
Art. XXVII.—Description of a Fossil Maxillary Bone of a 
Paleotherium, from near White River; by Hiram A. 
Prout, M. D. 
_ Te Paleotherial bone here described, was sent to me some- 
time ago by a friend residing at one of the trading posts of the 
St. Louis Fur Company, on the Missouri River. From informa- 
tion since obtained from him, I learn that it was discovered in 
or Great Bend of the Missouri River. The Incceramus appears 
correspond precisely with that figured by Professor Hall, in Fré- 
mont’s Expedition: it has however both valves, and may posst- 
bly be a distinct species. rf 
This fossil bone is a fragment of the inferior maxillary of the 
left side, consisting of the posterior part of the bone, together 
with the last three molar teeth. ‘The ramus is much fractured 
and presents an irregular surface; yet the general direction of 
its outline may be made out. The length of this fragment is 
