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0. C. Marsh— Restoration of Dinoceras mirabile. 31 
Art. V.—Restoration of DINOCERAS MIRABILE; by 
Professor O. C. MARSH. With Plate II. 
THE order of extinct gigantic mammals discovered by the 
writer in 1870, in the middle Hocene of Wyoming, and named 
Dinocerata, has now been investigated, and all the more impor- 
tant characters of the skeleton carefully determined. In this 
peculiar group of Ungulates, there are three well-marked 
genera: Dinoceras Marsh, the type genus, Tinoceras Marsh, and 
Uintatherium Leidy. These will be fully described by the writer 
in an illustrated monograph now nearly ready for publication. 
is memoir will be based upon the remains of more than one 
hundred and fifty distinct individuals of this order, now 
deposited in the Museum of Yale College. 
e type species of the Dinocerata is Dinoceras mirabile 
Marsh, and especial pains have been taken to work out the 
osteology of this animal, as a key to the structure of the group. 
Almost every bone in the skeleton is now known by various speci- 
mens, and this affords ample material for a restoration which 
orn, as in the Pronghorn (Antilocapra Americana). The sur- 
face of the osseous protuberances is very similar in both cases. 
