568 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The habitat of the Bermudan species as described above, however, 
and the presence of the form on islands where little or no fresh 
water occurs either in streams or pools other than those formed 
immediately after a shower, practically proves the origin of at least 
one form directly from a marine ancestor. 
It is not known whether the species is indigenous to Bermuda, 
for it is possible that it may have been accidentally introduced, in 
company with earthworms, with plants from some other part of the 
world. It is, however, quite distinct from any of the other known 
species of the genus, and is widely distributed on these islands. 
The fact that it lives below high-water mark as well as above sea 
level would indicate that it is indigenous if not peculiar to the Ber¬ 
mudas, for few if any plants living in the zone inhabited by the 
nemerteans have been introduced by man. 
The species occurs abundantly on the borders of the mangrove 
swamps at Hungry Bay and at Bailey’s Bay, and has been found at 
Walsingham Bay, on the shores of Castle Harbor, near the “ Cause¬ 
way,” at Hamilton Harbor, and in other localities. 
Sheffield Biological Laboratory, 
Yale University. 
