A. E. Verrili—North American Fresh-water Leeches. 127 
reatest diameter about ‘08. Head small, rounded in front, 
scarcely explanate, and separated only by a slight constriction 
from the body. Ocelli two, distinct, well separated, place 
near the posterior part of the head; two others, Lary small and 
CLEPSINE Savigny. 
This genus is very abundantly represented in our waters, 
both in individuals and species. A onge but two recogniz- 
under surfaces of floating logs and old pom of boards, or be 
neath the loosened bark of submerged 
decaying trees. Occasionally they adhere to the lower surface 
of turtles or other animals, but they seldom, if ever, suck blood. 
They feed upon insect larve, small worms, etc. Most of the 
+ ees are elegantly, and some are quite brilliantly colored, but 
the colors are often quite variable in the species, and cannot 
more importance. hen disturbed, these species cur] a 
posterior sucker, and before : ea the + usually present 
the essential characters and o 
the adult, though paler. 
