ENTOMOSTRACA OF MINNESOTA. ‘ 83 
long as the two remaining joints. The second joint is trapezoidal, 
shortest within. The third joint is about half as wide at base as the first, 
is straight without, with a sharp, small tooth at its distal third, and 
bifid at tip. On the inner margin this joint is at first dilated a little, 
and then deeply excavated to the narrow tip, to receive the lower end 
of the left leg, the lower two-thirds of this margin forming the segment 
of a circle. 
‘The right leg is two-jointed, the first joint twice as broad, enlarged 
at the lower end, forming an auriculate expansion at its inner inferior 
angle. The second joint is conical in outline and about two-thirds as 
long as the first. 
‘‘The terminal bristles of the rami are very broad and strong in the 
female, the outer one especially having an extraordinary size and 
thickness. There is also at the outer angle of each ramus a short, 
stout spine, that on the left ramus being inflated like the outer bristle. 
Length .065 in. 
“The legs of the fifth pair in the female are three-jointed and simi- 
lar, the basal joint short and broad, the second two and one-half times 
as long as wide. The leg terminates by four diverging teeth, preceded 
by two others, one on each side. 
‘‘Taken in the towing net abundantly in October, 1881, at Grand 
Traverse bay; also obtained rarely by Mr. B. W. Thomas, from the 
city water of Chicago.”’ 
Occurring in Minnesota, probably in Lake Superior. 
* Epischura fluviatilis Herrick. 
PLATE XIII, Fias. 14, 16. 
Herrick ’83, ’84 and ’87; De Guerne and Richard ’89. 
‘Similar to the above but smaller (0.04 in.). The females are very 
similar, though the fifth feet are more elongate and differently spined. 
The abdomen is perfectly straight and the three caudal set are of 
nearly equal size. The claw is armed with eight teeth, all but the first 
of which are emarginate. The abdomen of the male is straight, but 
has a strong process on the left side which bears a movable claw 
laterally and a small second segment which terminates in two small 
Spines. The fifth foot of the male is peculiar; the inner ramus (or the 
left foot) lamelliform, one-jointed, with two opposable claws; the right 
branch is simple and three-jointed, in form like that of the female. 
Here we have the most marked difference between the two species. 
Found in Mulberry creek, Cullman county, Ala. Although a consid- 
erable number were examined no oviferous females were found, while 
the males contained the spermatophores and can hardly be thought 
immature, and, as it is inthe male that the most marked differences 
appear, the two species seem certainly distinct.”’ 
6 
