316 MEMOIRS OF THE CARNEGIE MUSEUM 
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In the paleontological collection of the Carnegie Museum is another specimen, 
No 1418, Carnegie Museum Catalogue of Vertebrate Fossils (see Fig. 4), which I 
refer to the same species described above. The specimen was found on the Agate 
Spring Stock Farm, Sioux County, Nebraska, by Harold J. Cook, Jr., and was pre- 
sented by him to the writer. The specimen, having (although badly worn) 
incisors, a canine, and premolars in the upper jaw, and canines, and all the pre- 
molars in the lower jaw, supplements the type in important respects. Although 
the skull is distorted, it gives the complete length of the premaxillary and the 
nasals, which are damaged in the type. Anteriorly the nasals appear to be narrow, 
and terminate in a short subacute point, which slightly overhangs the anterior 
nares. In spite of the crushed condition of the skull it is possible to recognize char- 
acters like those encountered in the type of Thinohyus siouxensis. In No. 1418, the 
specimen under discussion, the excavations for the lower canines are deeper, and 
the anterior palatine processes of the maxillaries, immediately anterior to the 
canines, appear to be somewhat more constricted, than in the type. The distortion 
may possibly be in part the cause of this appearance. 
The animal was an old individual, as is plainly indicated by the extremely worn 
condition of the teeth. The crown of the median incisor in its worn state has the 
appearance of a large, short, subcircular cylinder, with a strong curved fang deeply 
