ENTOMOSTRACA OF MINNESOTA. 135 



short, one-jointed, armed with three short setse. 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 aud a straight seta. The inner rami of the second to 

 fourth feet are two jointed. The fifth feet are exactly like Brady's 

 AWieijdla cri/ptorum, 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 setae. The two 

 inner ones are short and pectinate, the next is long, the next is shorter 

 and finally two simple seta3. 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. 



* Cauthocamptus miunesotensis Herrick. 



Plate XXII, Figs. 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\ minutiis in abundance. Unfortunately the characters of the 

 swimming feet are not certainly known, but they were apparently all 

 three jointed save the last. The antennae 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- 

 giuate (see Fig. 4). 



