174 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



In the United States National Museum are two specimens which 

 the writer refers to this species. They have the catalogue numbers 

 5514 and 2643. Each consists of the hinder part of the skidl, together 

 with the horn-cores. 



No. 5514 (pi. 11, figs. 1, 2) was found on the Tanana River, about 

 20 miles above its mouth, by Mr. Charles Sheldon, by whom it was 

 presented to the Ignited States National Museum through Mr. W. H. 

 Osgood. The measurements are to be found in the third column on 

 page 168. 



No. 2643 of the United States National Museum (pi. 11, figs. 3, 4) 

 was obtained on the Old Crow River, in Yukon Territory, by A. G. 

 Maddren, of the United States Geological Survey. It consists of the 

 rear of the skuU bearing the complete horn-cores. A figure showing 

 the skull and horn-cores from behind was published by Mr. C. W. 

 GUmore.^ The measurements are presented in the fourth column on 

 page 168. The horn-cores are more strongly grooved than in most 

 specimens. Both of the specimens just mentioned have likewise the 

 horn-cores more flattened than most other individuals. 



In the Field Museum of Natural History, Chicago, there is part of 

 a skull with both horn-cores, the one of the right side lacking the tip 

 (pi. 12, figs. 1, 2). The cranium is preserved to the fronto-nasal 

 suture. The specimen is labeled as having come from Point Barrow 

 and was purchased in 1902 from the University of Pennsylvania. 

 The figures show the directions taken by the horns. The forehead 

 is nearly flat. 



The following measurements were taken by the writer: 



Measurements of No. 6832, Field Museum Natural History. 



mm. 



Width at the rear of the orbits 330 



Width between the orbits and bases of horn-cores 290 



Width between bases of the horn-cores 310 



Extent from tip to tip of horn-cores (estimated) 860 



Distance between the hinder ends of the temporal fossae 193 



In the American Museum of Natural History there is part of a 

 skuU (pi. 12, figs. 3, 4) which presents the face as far forward as the 

 fronto-nasal suture and both horn-cores, of which the left one is 

 imperfect and the right one lacks a small part. The exact locality is 

 unknown, but it is said to have been found somewhere in the vaUey 

 of the Ohio River. This skull has furnished the following measure- 

 ments : 



1 Smiths. Misc. Coll., vol. 51, pi. 12. 



