82 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



''Body small, eye single, near the anterior margin of the shield. 

 Antennte large, and as long as in the preceding genus {Cyclops), and 

 has the same motions in the water. Abdomen terminating in two 

 styles, each with three setee; last or three last joints. Ovaries none; 

 legs spiny." 



What is meant by the "brush" fails to appear, unless the speci- 

 mens were ornamented with some parasitic plants or animals. The 

 three setfe of the caudal stylets and long antennae will place this form 

 in no American genus save Epischura. But even this statement of 

 Pickering may be held doubtful. 



* Epischura laciistris Forbes. 



Plate XIII, Fig. 15. 



Forbes '82; Herrick '84 and '87; De Guerne and Richard '89. 



"The second segment of the abdomen of the male is twice as long 

 as the first, and produced to the right as a large, elongate, triangular 

 process, somewhat hooked backwards at the tip. The third segment 

 is similarly produced, but rounded and expanded at the tip, which is 

 roughened before and behind. 



"From the right side of the fourth segment arises a stout process 

 bearing at its apex a hatchet-shaped plate with seven broad obtuse 

 serratures on its anterior margin. This process is roughened behind, 

 where it is opposed to the concave side of the left ramus of the furca. 

 From the same side of the fifth segment, a short flattened plate, of a 

 spatulate or paddle like form, extends forward above or beyond the 

 toothed process just mentioned. 



"The antenna? are 25-jointed, and reach to the second segment of the 

 abdomen. There are especially prominent sensory hairs on the first 

 and third joints, borne at the tips of long spines. The antennules 

 are short, the ramus apparently but three-jointed, the short, median 

 joints common in this appendage being only obscurely indicated. The 

 mandible has but seven teeth, the first simple and acute, separated 

 from the second by an interval about equal to the second and third, 

 the second to the sixth bifid, the seventh entire and acute. The usual 

 plumose bristle is replaced by a sharp, simple spine. 



' ' The outer ramus of the fourth pair of legs has two teeth at the outer 

 tip of each of the two basal joints. The terminal joint of this ramus 

 is armed as follows: a short simple spine at middle of outer margin 

 and another at the distal outer angle; a single and long terminal seta, 

 strongly and sharply toothed externally and plumose within, and four 

 long plumose setse attached to the inner margin. 



"The left leg of the fifth pair in the male, viewed from behind, has 

 the basal joint very large, broader than long, with the inner inferior 

 angle produced downwards as a long, stout, curved process or arm as 



