636 U. 8. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



probably to the northwest coast ; to the north it reaches as far as Melville Island, or even still 

 further. It is also found in Greenland, whence the skulls and horns in the Smithsonian col 

 lection were obtained. 



It is a question, admitting this to be a distinct species, whether it should bear the name of 

 groenlandicus or arcticus. Following the strict law of priority, however, I have retained the 

 former, although objectionable on account of its local character. 



