1897.] Some Manitoba Cladocera. 299 
Scapholeberis angulata : Was taken only in small numbers, a 
few being found in Rat Creek on Portage Plains. 
Daphnia pulex var. pulicaria: Was found in small numbers 
in a prairie slough near Portage la Prairie. 
Simocephalus daphnoides(?) The body is robust, with greatest 
height a little behind the middle. The head is rounded in 
front and has nospines. Lower margin of the head is slightly 
concave, straight, or even slightly convex to the base of the 
short beak which may project at nearly a right angle to the 
lower margin of the head. The head is separated from the 
body by only a very slight depression. Depth of the head in 
one specimen is .077 mm.; length from the posterior margin 
of the base of the antenne .052 mm. The head has a daphnia- 
like appearance. The ventral margin of the shell has few 
very short blunt teeth. The posterior margin from short blunt 
posterior spine toward dorsal margin has teeth better devel- 
oped than those on the ventral margin. The dorsal margin 
teeth continue forward a short distance. The posterior spine 
is very short, blunt, armed with short teeth and is situated 
little above the middle of the posterior margin. 
The eye is of moderate size, situated near the front of the 
head or at a short distance from the front, and at a distance 
from the lower margin equalling one-half the diameter of eye, 
or at a distance slightly greater than diameter. Pigment fleck 
is irregular in shape; elongated, rhomboidal and oval forms 
were seen. Pigment fleck is small, situated near the posterior 
margin of the head. 
Specimens measured vary in length from 2.04 mm. to 2.53 
mm.: in depth from 1.20 mm. to 2.04 mm. 
The description of S. daphnoides as given by Herrick in 
American NATURALIST, May, 1883, and in Entomostraca of 
Minnesota, is rather brief. Herrick states that the form is 
found only south of the Tennessee River; but a comparison of 
specimens taken in Manitoba with the original drawings and 
brief description in the American Naturaist makes it ap- 
pear that the form is found even in that northern province. 
Lilljeborg’s “ Crustaceis ” published in 1853 gives drawings 
of S. vetulus with the lower margin of the head as nearly 
