472 Wisconsin Academy of Sciences, Arts, and Letters. 
erally and in front, and bears a strong spine on each side. 
The second segment is short, being only about one-half the 
length of the third. The third segment and the fureal rami 
are about equal in length. The furcal rami are ciliate on both 
the inner and outer margins. 
The antennae are 25-segmented, and reach to the end of the 
furca. The right antenna of the male is much swollen ante¬ 
rior to the geniculating joint; the antepenultimate segment 
bears a slightly recurved hook considerably less in length than 
the penultimate segment. In the female fifth feet, the spines 
of the first basal segments are pronounced. The first segment 
of the exopodite is about twice as long as wide. The hook of 
the second segment is nearly as long as the first segment, is 
slightly curved, and is denticulate on the inner margin. The 
hook has a single fine tooth on the outer margin. There is a 
small spine at the base of the third segment. The third seg¬ 
ment is distinct, and bears two spines of which the inner is the 
longer. The endopodite is indistinctly two-segmented, and is 
about one-lialf the length of the first segment of the exopodite. 
It is setose at tip. 
In the male fifth feet, the spines of the first basal segments 
are stout. The length of the second basal segment is some¬ 
what less than twice its width ; it is trapezoidal in form, and 
wider at the distal end. The lateral hair is situated close to 
the distal end of the segment. The proximal inner angle is ex¬ 
panded into a wing-like process. At a little less than one-half 
its length, there is on the inner margin a recurved hyaline 
tooth. On the posterior surface of the segment is a two-headed 
hyaline process. The first segment of the exopodite is short, 
its length being only about one-half its width. The outer dis¬ 
tal angle is somewhat extended. The segment has a hyaline 
lamella on its posterior surface, and a small hyaline projection 
from its posterior distal border. The second segment of the 
exopodite is between three and four times as long as the first 
segment. The lateral spine is situated at about four-fifths 
of its length, is long, nearly straight, and finely denticulate on 
its inner margin. On the posterior surface of the segment, 
