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



foot almost twice as long as the exterior spine. Terminal joint of the 

 fifth foot small, armed with a spine and a seta; seta of the basal seg- 

 ment short. Ovisacs oval, somewhat divergent. Length 0,75 mm. 

 Found only in Scandinavia. 



* Cyclops varicaus Sars. 



Plates XIX, Figs. 12 and 13; XXX, Figs. 2-8. 



Sars '63; Uljanin '75 (orientalis) ; Lande '90; Schmeil '91 and 92. 



The American form which approaches nearest to this species dif- 

 fers from it apparently in proportions. Unhappily we have only 

 gathered the species once and our information depends on the camera 

 drawings taken at that time. Eather slender, especially the abdomen 

 which is nearly as long as the cephalothorax. First abdominal seg- 

 ment very long, as long as the rest of the abdomen. Stylets over 

 twice as long as wide, lateral spine one third from the apex, outer 

 lateral spine shorter than inner seta, median setse rather long, outer 

 two- thirds as long as inner, inner three- fourths as long as abdomen. 

 AntennsB shorter than the first thoracic segment, 12-jointed, formula 

 -———--::::: — ---» sette of moderate length. Feet with the fol- 

 lowing formula: 



Eespecting the fourth foot it is plain that the last joint is homol- 

 ogous to two fused segments, and that the separation might take 

 place at the next moult. 



Fifth foot as in G. bicolor, but the basal segment more distinct, 

 apical segment long, cylindrical and bearing a long seta. In the form 

 of the stylets and antennie this species corresponds to Schmeil' s figures, 

 but the first segment of the thorax is shorter and the abdomen is 

 more slender. The specimen from which our outline was taken 

 was extended by pressure, while that figured by Schmeil may be a 

 little fore-shortened. We must leave to later study the settlement of 

 the question, as also that of the relation between this and the next. 

 Length 0.8 mm.; abdomen 0.35 mm., stylet 0.05 mm., longest seta 

 0.28 mm., antennae 0.23. 



