Osgood — Thi Name of the Rocky Mountain Sheep. 61 



name appears with both text and figure, whereas, montana has 

 only a figure and cerrina only a diagnosis. 



The facts of first importance regarding the three names may 

 l)e summarized as follows: 



(1) els canadensis was firsl published, with description and 

 figure, early in 1804. An exact date is not ascertainable. 



This information was obtained by collation of parts of the work 

 in which it appeared and reference to contemporaneous litera- 

 ture by bibliographers of the highest rank. There is no more 

 reason to douht this date than that of any other work without 

 title-page imprint, and unless all such are to he rejected, it 

 must he accepted. This name was the first to lie used by 

 modern authors upon the basis of its real date and therefore 

 should stand, unless it can he proved that some other name has 

 priority over it. This has not been done. Moreover, by 

 Recommendation (A), Article 28, International Code of Zoologi- 

 cal Nomenclature, the selection of this name is imperative. 



(2) Oris cerrina was first published, with description only, 

 in the year 1804, as indicated by ;i title-page imprint. An 

 exact date is not ascertain a hie. Attempts to substitute this 

 name for canadensis never have shown its prior publication. 



(:*>) Ovis montana was first published, with figure only, in the 

 year 1804. An exact date is not ascertainable. This infor- 

 mation was obtained by bibliographic investigation, since the 

 plate was not dated. Its use is open to the same objections as 

 that of cerrina. 



