SO Wisconsin Academy of Sciences, Arts and Letters. 
The existence of these various subterranean species in so 
many remote localities suggests that the underground fauna of 
North America may be more extensive than is commonly sus¬ 
pected, and that there are numerous underground highways of 
dispersal of considerable extent. So far as I can ascertain, 
none of the subterranean species of North America has been 
taken in the surface waters except Gammarus purpurascens, 
which was originally described from Nickajack Cave, Tennes¬ 
see, but was also found to occur in a spring at Rossville, 
Georgia. In the latter locality it was not improbably brought 
up from below. With the exception of Gammarus purpuras¬ 
cens, all of the subterranean Amphipoda of this continent are 
either blind or have the eyes in a rudimentary condition,—a 
fact which indicates that they are permanently subterranean 
forms and not accidental inhabitants of underground waters. 
Zoological Laboratory, 
University of Wisconsin. 
