WILLIAM COOPER 



mollusks, etc., as quoted in Binney's edition of 

 the Invertebrates of Massachusetts, 1870 ; 

 also at Greenport, L. I., and other places in the 

 vicinity of New York, and at the Bahama 

 Islands. 



The results of Mr. Cooper's former collec- 

 tions in other branches, although chiefly pub- 

 lished long before this time, and investigated 

 by Prof. Baird, furnished two new species, re- 

 markable when compared with the extensive 

 series of specimens obtained by the Govern- 

 ment expeditions. 



One was a new genus of field-mouse allied 

 to the Lemmings, founded on two very imper- 

 fect specimens, probably collected in the 

 Northwestern States by Schoolcraft or some 

 other unskilled taxidermist. 



It was named ll My odes Cooper z" by Baird in 

 1857, but between '57 and '67 it was obtained 

 in great numbers from Illinois and northwest to 

 Alaska, proving to be of a new genus (Syn- 

 aptomys Baird), of which Coues writes, in 

 1877, that it is "the most remarkable genus 

 of the sub-family ; one singularly combining 

 the peculiarities of two other widely separated 



