* 
A. E. Verrill—North American Fresh-water Leeches. 185 
an inch long by ‘85 wide, including the margin; the smallest 
was ‘87 long by ‘30 wide. 
NEPHELOPSIS, gen. nov. 
or pyriform vesicles, apparently but eleven on each side. 
This genus has a remarkable combination of the characters 
of Nephelis, Trocheta and Aulastomum, In general habit and 
form of body it is much like Trocheta, but there are no maxille. 
Nephelopsis obscura, sp. NOV. 
Body much elongated in extension, depressed posteriorly, 
distinctly annulated, a little rugose anteriorly, in contraction. 
Length in extension 4 to 5 inches; breadth ‘25 to 35 of an inch. 
two pairs on the sides of the buccal agacth small, distant, the 
e outer pair of anterior 
ones. Inner surface of the upper lip very rugose, the suica- 
his species was taken in May, 1870, when numerous egg 
capsules were also found attached to the stones along the shores. 
Aulastomum lacustre Leidy. 
Proceedings Acad. Nat. Sciences of Philadelphia, for 1868, p. 229. 
_ This species, well described by Dr. Leidy, has 10 ocelli; eight 
in the upper lip, the last pair separated by an annulus from 
