som s.” 
ae 
: 
aS 
ENTOMOSTRACA OF MINNESOTA. 135 
short, one-jointed, armed with three short sete. The branches of the 
first foot are equal, the outer three-, the inner two-jointed. The joints 
of the latter are equal and spined laterad. The first segment bears on 
the mesal aspect a short seta, the second a short seta, and at the end 
a long seta and stout spine. The apical segment of the outer ramus 
bears a spine and at the apex a spine twice as long as the lateral one, 
a curved seta and a straight seta. The inner rami of the second to 
fourth feet are two-jointed. The fifth feet are exactly like Brady’s 
Attheyella cryptorum, which Poppe thinks may have arisen by degenera- 
tive modification of this species. 
The fifth feet of the male are two-jointed; the inner portion of the 
first segment is less developed than in the female and bears two short 
pectinate bristles. The oval apical segment has six sete. The two 
inner ones are short and pectinate, the next is long, the next is shorter 
and finally two simple sets. The inner ramus of the third leg of the 
male is three-jointed and is longer than the second joint of the outer. 
The first joint is very short with a small seta internally, the second 
segment is twice as long with a stout, curved pectinate seta, the 
apical segment is unspined but bears a long pectinate seta. Length of 
male 0.544 mm. Occurring in various fresh-water lakes of northern 
Germany. 
* Canthocamptus minnesotensis Herrick. 
PLATE XXII, Fias. 1-6. 
Since the manuscript of this genus was finished, a small species has 
been found which seems undoubtedly distinct from any of the above. 
A single pair were taken in a gathering from Bassett’s creek contain- 
ing C. minutus in abundance. Unfortunately the characters of the 
Swimming feet are not certainly known, but they were apparently all 
three jointed save the last. The antenn are very short and thick, 
eight-jointed, with a long flagellum; the antennules are of the usual 
form, and the mouth parts rather large. The first pair of feet have 
the two rami of nearly equal length. The form is moderately elongate. 
The caudal stylets are very short, quadrate in outline and well armed 
with spines. The fifth foot of the female has four long and two short 
spines on the inner lamina, and the terminal joint has five unequal 
spines. In the male the fifth foot has two spines on the lamina and 
six on the second joint, one being a small bristle. The male antenna 
is of peculiar form. The teeth of the anal plate are large and emar- 
ginate (see Fig. 4). 
