





400 . THE AMERICAN NATURALIST. ; 
|. ^ . further evidence can be adduced. We seem to have in this 
: form a species that is stable, rather than one that is in- 
process of rapid evolution. 
I am indebted to Dr. C. B. Davenport for valuable sugges- 
|. tions and assistance in carrying on this is, iic. aniey 




EN . HULL BIOLOGICAL LABORATORY, 
CAGO UNIVERSITY 

