176 Professor Marsh’s Monograph of the Dinocerata. . 
entire season. Among the very large collections thus secured, 
were numerous specimens of the Dinocerata, which furnished 
important characters of the group. 
“In the succeeding spring, 1872, the explorations in this 
region were continued, and soon resulted in the discovery of 
the type specimen, including the skull, and a large portion of 
the skeleton, of Dinoceras mirabile, and on this new genus 
the author based the order Dinocerata. 
“Other important specimens, obtained at this time, and 
described by the author, were the types of Déinoceras lucare, 
Tinoceras grande, Tinoceras lacustre, and others of scarcely 
less interest. 
most of the doubtful points in this group. 
“The research was continued systematically during the next 
season, also, 1874, and again in 1875, with good results. Since 
then, various small parties, at different times, have beet 
equipped and sent out by the author to collect in this basin; 
and, finally, during the entire season of 1882, the work was 
vigorously prosecuted under the direction of the author, an 
from July of that year, under the auspices of the United 
States Geological Survey. ; : 
“The specimens thus brought together by all these various 
expeditions and parties are now in the museum of Yale Col- 
lege, and represent more than two hundred individuals of the 
Dinocerata alone. * * The present volume is based on 
this material, amply sufficient, it is believed, to illustrate 
the more important parts of the structure of this remarkable 
group. | 
“The remaining material of the Dinocerata, now know?, 
consists of a few specimens collected by Dr. Leidy in 1872, 
including the type of the genus Uintatherium,; various 
remains secured in the same year by Prof. Cope, to which he 
applied the names Loxolophodon and Hobasileus, with a later 
acquisition called Bathyopsis ; and a number of specimens 
more recently obtained by parties from Princeton College- 
Although these remains show few, if any, characters of the 
mocerata not better represented in the larger collection 0 
the Yale Museum, full references to the more important speck 
mens, in most cases with illustrations, are given in the present : 
memoir. 
