198 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
the latter. The valves are marked off by fine lines into large quad- 
rate meshes. The dorsal abdominal processes rise separately, the two 
anterior, however, in immediate contact at their bases. The first of 
these is decidedly the longer, but the third process is distinct, 
although low. The anal sete are two-jointed, the second joint the 
shorter. The abdomen is regularly narrowed backwards, and the 
anal groove is provided with twelve to fifteen teeth on each side, com- 
monly the latter number. The terminal claws are without accessory 
comb. The intestinal cceca are short, not longer than the diameter 
of the eye, and extend directly forward. Length 2.0 to 2.5 mm.; depth 
half the length, sometimes a little more. Length of spine variable, 
but commonly about equal to the depth of the shell.” 
As to the specific rank of this form we suspend judgment for the 
present. 
[Daphnia hermani Daday. | 
Daday ’88. 
Head broad, compressed, front rounded, beak round, projecting 
ventrad. Eyelarge. Macula nigra absent. Shell oval, with a long 
spine. Abdominal processes discrete. Claws without teeth but orna- 
mented with a continuous series of fine sete. Anal teeth six, dimin- 
ishing dorsad. Length 0.5 to 0.8 mm. 
This we may unhesitatingly regard as a form of D. hyalina. 
Daphnia sarsii Schoedler. 
Sars ’60 (carinata); Schoedler ’77; Elymann ’87 (carinata). 
A. large yellowish species with a strong dorsal keel. Head uni- 
formly curved, slightly concave behind the eye, with a long oblique 
beak. Dorsal and ventral margins curved. Spine short and curved, 
‘springing from near the middle of the caudal margin- The abdominal 
processes long and united at the base. Claws without teeth. Length 
‘2.5mm. The very insufficient description may help to place a form 
not recognized since Sars described it. 
When D. carinata King is finally placed among its congeners this 
‘species will preoccupy Sars’ name. 
Daphnia paludicola Hellich. 
A large species of a dirty yellow color. Head depressed, front 
scarcely protuberant, ventral surface slightly concave, beak sharp, 
short. Antennules very small. Shell deep, oval, with a short curved 
spine springing from the middle of the caudal margin. First abdomi- 
nal process much longer than the second, to which it is fused. Post- 
