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 Seandinavia. 
* Cyclops varicans Sars. 
PLATES XIX, Fies. 12 AND 13; XXX, Fias. 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. Rather 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 sete rather long, outer 
two-thirds as long as inner, inner three-fourths as long as abdomen. 
Antenne shorter than the first thoracic segment, 12-jointed, formula 
~~ ~~ 
——-——-xX-—-—=X=-, sete of moderate length. Feet with the fol- 
lowing formula: 
FIRST FEET. 
ex. 3 spines. ex.) i 1\seta: 
Outer ramus ap. 2 sete. Inner ramus 4 ap. 1 spine, 1 seta. 
in. 3 sete. in. 3 sete. 
FourtTH Foor. 
ex. 3 spines. ° : ex, | ljseta- 
Outer ramus 4 ap. 1 spine, 1 seta. Inner ramus ; ap. 1 spine, 1 seta. 
in. 4 sete. sas 4 set. 
Respecting 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 C. bicolor, but the basal segment more distinct, 
apical segment long, cylindrical and bearing a long seta. In the form 
of the stylets and antennz 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., antenne 0.25. 
