ENTOMOSTRACA OF MINNESOTA. lOi^ 



Third Foot. 



{ex. 2 spines. f ex. 1 seta, 



ap. 1 spine, 1 seta. Inner ramus s ap. 2 spine?'. 



in. 4 selfe. (in. 1 spine, 2 set se. 



Fourth Foot. 



(ex. 2 spines. f ex. 1 seta, 



ap. 1 spine, 1 seta. Inner ramus < ap. 2 spines, 



in. 4 setae. (in. 2 setse. 



The fifth foot is obscurely three-jointed^ the second joint bearing a 

 short spine and the terminal joint two spines of varying length. The 

 caudal stylets are once and a half as long as the last segment, and are 

 peculiarly excavated for more than the caudal one third, beginning at 

 the point where the lateral spine is situated. The outer apical seta is 

 short, the median setie are rather short while the inner seta is nearly 

 as long as the outer median. All these sette are pectinate. The recep- 

 taculum seminis is elongate oval. The antenna of the male is divisi- 

 ble into five regions, the third, being formed by the thickening and 

 union of four or more segments. Color violet or purplish red. 



* Cyclops capillilerus Forbes. 

 Plates VI, Fig. 13; XXVIII, Figs. 1-4. 

 Forbes '93. 



This is a symmetrical, compact Cyc^opSj with the cephalothorax: 

 closely articulated, widest in the middle, and the sides regularly con- 

 vex, with the abdomen narrow and slender, with three well developed 

 caudal sette, and 16 jointed antennie bearing several very long setJE. 



The abdomen, with caudal furca, is contained a little less than 

 twice in the cephalothorax, and the breadth of the latter is just half 

 its length. First segment very long, five times the length of the sec- 

 ond; second and third equal; the fourth very short, on the median 

 line semicircularly excavate behind. The abdominal segments in the 

 female diminish regularly in length from first to last. The caudal 

 rami are twice the length of the last segment and one fourth as broad 

 as long. The lateral seta is placed a trifle beyond the middle of the 

 ramus; the outer terminal seta is a short, naked spine; the other three 

 well developed and plumose. The inner and outer of these are of 

 nearly equal length, the latter a little longer, the middle one much 

 the longest one of the group. Antenna moderate, reaching about to 

 the middle of the second segment of the cephalothorax. Sixteen- 

 jointed in all adult females, and further especially distinguished by 

 the presence of very long flexible setre upon the first, third, tenth and 

 fourteenth segments. Terminal set?e likewise very long. The seta 

 borne by the first segment extends to the twelfth; that of the third 

 reaches to the fourteenth; that upon the tenth segment extends to the 



