452 Wisconsin Academy of Sciences t Arts, and Letters. 
is strongly denticulate on the inner margin and less so on the 
outer. It is armed with three spines. The inner two are 
upon a distinct base, which represents the third segment. 
These two spines are pectinate, and the inner is considerably 
the longer. The endopodite is slender, about equal in length 
to the first segment of the exopodite. It is setose at tip and 
armed with two long plumose spines. 
The spines of the first basal segments of the male fifth feet 
are small and acute. The second basal segment of the right 
foot is quadrate, with the lateral hair situated near the distal 
angle. Upon its posterior surface near the inner distal angle 
is a short hook-like process. On the inner margin at a little 
less than half its length is a small conical process. Urom the 
middle of the posterior surface near the distal end arises a 
stout falciform process which nearly equals in length the first 
segment of the exopodite. The first segment of the right exo¬ 
podite is equal in length to the second basal segment. It is 
arcuate, the inner surface being concave and the outer convex. 
The second segment is longer than the first, quadrangular, and 
has the lateral spine at the outer distal angle. The terminal 
hook is rather stout, falciform, symmetrically curved, and equal 
in length to the segments of the exopodite. The inner margin 
is markedly denticulate. The endopodite springs from the 
inner margin of the second basal segment. It nearly equals 
one-half the length of the first segment of the exopodite. It is 
setose at tip. 
The left foot reaches to the end of the first segment of the 
right exopodite. The second basal segment is trapezoidal in 
form, as wide as long, and has the lateral hair near the distal 
angle. The first segment of the exopodite is longer than wide 
and setose on the inner distal angle. The second segment of 
the exopodite is long and slender, arising from the outer half 
of the distal end of the preceding segment. Its margins are 
slightly concave, and the inner margin is setose. It is termi¬ 
nated by a digitiform process and a stout spine. This spine is 
armed on its inner surface with stout spinules. The endopo¬ 
dite is long and slender, reaching one-half the length of the 
