NOTICE OF A NEW FOSSIL MAMMAL FROM SIOUX 

 COUNTY, NEBRASKA. 



BY ERWIX IIIXCKXEY BARBOUR. 



During the summer of 1905 the geological expeditions of the 

 Hon. Charles H. Morrill of Lincoln were again resumed after a 

 lapse of six or eight years. Owing to the over-crowded condition 

 of the State Museum, coupled with unusual fire risks, Mr. Morrill 

 withdrew his patronage, which had been so liberal since 1891. 



Early in 1905 the State Legislature, pursuant to recommenda- 

 tions by Chancellor Andrews and the Board of Regents, voted the 

 sum of fifty thousand dollars for the erection of a portion of the 

 first wing of a new fireproof museum. Thereupon Mr. Morrill 

 again offered substantial support to the amount of one thousand 

 dollars annually for geological work. A party of students was 

 organized and sent at once into the field to collect vertebrate fossils 

 in the Daimonelix beds (Loup Fork) of Sioux county, at Agate, 

 Nebraska, on the ranch of Mr. Tames Cook, which is an extensive 

 one including some twelve miles along the Niobrara river. 



As early as 1875 the bone beds of this region were recognized 

 by Mr. James Cook. In 1892 they were visited by the writer, and 

 collections were made by the Morrill geological expedition of that 

 year. In the meantime every exposure of these beds throughout 

 the entire region has been explored from year to year by Mr. 

 Harold Cook. By him the specimen herein described was discov- 

 ered, and for him it is named. Several discoveries were made dur- 

 ing the season, but this one seems to outrank the others. 



At first the skull and mandible were thought to constitute the 

 known remains of this remarkable new fossil, but since this paper 

 was begun it transpires that large blocks of material which had 

 been taken out in connection with the skull, are literally packed 

 with bones belonging to it. Though these bones are not sufficiently 

 freed from the matrix to admit of description, yet it is now pos- 



