432 Wisconsin Academy of Sciences, Arts, and Letters. 
with rather small spines. The lateral hairs of the second basal 
segments are delicate. The exopodite is composed of three seg¬ 
ments. The first segment is stout, its length being to its 
breadth as l 1 /^ to 1. The second segment is produced into the 
customary hook, which is armed with short hairs on its inner 
margin and with a spine on the outer distal angle. The third 
segment is distinct and armed terminally with two spines, the 
inner being distinctly plumose. The endopodite is nearly a 
third longer than the first segment of the exopodite, and is in¬ 
distinctly divided into two segments. It is terminated with 
two rather long spines, and is armed on the inner surface of the 
tip with short, stout hairs. 
In the male fifth feet, the spines of the first basal segments 
are also rather small. The second basal segment of the right 
foot is considerably longer than broad, and its inner and outer 
margins are curved. The lateral hair is situated at three- 
fourths of its length. The first segment of the right exopodite 
is nearly square. The second segment is more than twice the 
length of the first, and the lateral spine is situated nearly at 
the end of the segment. The terminal hook is falciform, quite 
symmetrical in its form, and equals in length the combined 
lengths of the basal segments and of the exopodite. It is finely 
denticulate in the inner margin. The endopodite is slender 
and somewhat longer than the first segment of the exopodite. 
The left fifth foot of the male extends to about one-half the 
length of the second segment of the right exopodite. The lat¬ 
eral hair of the second basal segment is situated very near the 
end of the segment. The first segment of the exopodite is 
about twice as long as broad, and armed on its inner surface 
with a setose pad. The second segment is rather more than 
half the length of the first and is armed terminally with two 
blunt processes. It has also two setose pads, one nearly ter¬ 
minal and the other on the proximal half of the inner surface. 
The endopodite is indistinctly two-segmented, is slender, and 
slightly longer than the first segment of the exopodite. 
Torbes, in the original description, speaks of the female ab¬ 
domen as being asymmetrical. This did not appear to be the 
