6 WHEELER. 



which I have examined the nephridial papilla lies between the 

 most proximal and the succeeding pad, as in P. edwardsii, but dis- 

 tinctly nearer the posterior than the anterior surface of the leg. 



The pedal grooves are conspicuous on the inner ventral sur- 

 faces of all the legs in P. eisenii. They are slit-shaped, with 

 thickened, somewhat folded lips. None of the specimens show 

 conspicuous tubercles behind the grooves of some of the pos- 

 terior legs, like those which have been found in the males of 

 P. edwardsii . 



The anus is terminal ; the reproductive orifice is in the mid- 

 ventral line, between the penultimate pair of legs, as in other 

 American species. 



Hull Zoological Laboratory, University of Chicago, 

 February 28, 189S. 



