444 Wisconsin Academy of Sciences, Arts , and Letters. 
endopoclite nearly equals in length the first segment of the outer 
ramus. The two terminal spines are rather long, and the inner 
margin of the tip is setose. 
The first basal segment of the right fifth foot of the male is 
armed with a spine of moderate size. The second basal seg¬ 
ment is quadrangular in form, its length being about twice its 
width. The lateral hair is situated nearly at the distal end 
of the segment, blear the distal end of the segment, on the 
posterior surface, is a shelf-like projection, from which arises 
a blunt hook which extends distally over the proximal end of 
the first segment of the exopodite. The first segment of the ex¬ 
opodite is quadrangular, about twice as long as wide. The sec¬ 
ond segment of the exopodite is rather slender, its length being 
somewhat less than three times its width. The lateral spine is 
short, and situated well towards the distal end of the segment. 
The terminal hook equals in length the preceding segment, is 
slightly curved, and is serrulate on its inner margin. The en- 
dopodite is somewhat variable in length, sometimes being about 
two-thirds the length of the first segment of the exopodite, and 
at others nearly equaling that segment. It is armed with fine 
hairs at the tip. In the left fifth foot of the male, the spine of 
the first basal segment and the lateral hair of the second are 
situated as in the right foot. The length and width of the second 
basal segment are about equal. The first segment of the ex¬ 
opodite is about twice as long as wide, quadrangular in form r 
with its inner distal angle setose. The second segment is irreg¬ 
ular in form, about four times as long as wide, setose on the 
inner margin. It is armed on the distal extremity with a fin¬ 
ger-like process and a long, curved spine; this spine is setose. 
The endopodite is slender, somewhat curved at its distal part,, 
and considerably longer than the first segment of the exopo¬ 
dite. It is setose on the inner margin of the tip. 
Authors vary somewhat in regard to the length. In Forbes’s 
original paper, the average length is; given as 1.778 mm., no 
distinction being made as to sex. De Guerne and Richard give 
the length as about 1.5 mm. Herrick and Turner give the 
length of the female as 1.5 to 1.7 mm., and that of the male as 
