ENTOMOSTRACA OF MINNESOTA. 131 
rather long and slender and have a well-marked flagellum. (Brady 
figures no flagellum.) The palp of the antennule is as in ©. minutus. 
The mandibular palp is small. The first pair of feet normal, rather 
small; all the other swimming feet with two jointed inner rami, save 
in the case of the male third foot. The fifth feet are exactly as figured 
by Brady, save that there is a prominence or tooth of the basal seg- 
ment near the point of attachment of the terminal joint which is quite 
long. ‘The sensory area of the head is oval and pointed. The male 
antenna has a long flagellum, not, as figured by Brady, a very 
Short one. The egg-sac is very large, oblong. The animal seems to 
fall short of the size of the Hnglish species, though measuring upwards 
of 0.65 mm. Our form is very well distinguished from any other spe- 
cies. It is found in Lake Minnetonka, Lake Calhoun, and elsewhere. 
* Canthocamptus minutus Mueller. 
PLATES XLVII, Figs. 7-21; L, Fias. 7, 8. 
Monoculus staphylinus—J urine. 
Canthocamptus minutus—Lilljeborg, Baird, Sars, Uljanin, Brady, Herrick. 
Canthocamptus staphylinus—Claus, Fric. 
Canthocamptus minutus var. oceidentalis—Herrick. 
A well-known species which has been frequently described and 
seems quite circumpolar in its distribution. 
First mentioned from America in a paper by the writer in 1878 
A pretty full description will also be found in the author’s Types of 
Animal life. A very abundant species, frequent in muddy pools, but 
somewhat variable in abundance. It may frequently be found in great 
numbers in winter. 
[The following description, compiled from Types of Animal Life, is 
inserted here for the convenience of those who are likely to use.this 
report asa manual. H. F. N.] 
Length about 1.0mm. Antenne a little longer than the first seg- 
ment of the body; first three joints profusely covered with hairs; fourth 
joint more slender than the preceding and terminating in a process 
below, which bears, besides a long hair, a peculiar blunt bristle; fifth 
joint shorter than the rest; the remaining three joints are spined at 
definite points. The antennie of the male are geniculate; the three 
basal joints are short while the three following joints are coalescent 
and are followed by a hinge joint of two elongated segments. 
The antennules are two-jointed; the basal joint bears a two-jointed 
palp; the terminal joint is covered with spines; at the end there are 
three longer and curved spines, jointed in the middle, and the upper 
furnished with three small spines at the curve. 
9 
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