I5YRNES: CYCLOPS OF FRESH WATER. 



27 



Foot No. 



Ramus Outer or Inner. 



Outer .Spines 

 .\pical Spines , 

 Apical Seta . . 

 Inner Set;\:- . . , 



II 



11 





 2 

 3 



III 



11 

 1 

 1 

 3 



IV 



11 

 2 

 

 9 



^seta. ^lis very small; 2 are heavy, ^long. 



C. niodcstns seems to represent a well determined type in which 

 the forms are stable and in which there is but slight variation. 



Cyclops Scrnilatits, Forhes (Plate XII.). 



C. serndatus is a small orange colored Cyclops of very wide 

 distribution. It is for the most part an inhabitant of fresh water 

 streams and ponds. I have usually found C. scrntlatns in company 

 with C. si(/nafiis, which is a much larger form and which sometimes 

 pre}s upon it. It is easily recognized by its small size, its pro- 

 nounced color and b\- its quick darting movements. There are 

 two clearly distinguishable forms of C. scrntlatns in one of which 

 the ova are dark olive green, both when in the ovaries and when 

 appended to the body. In the other form, the ova are a dark pur- 

 ple. The characteristics of C. scrrulatns, Forhes, are all present 

 in the Long Island forms. The only difiference from the type is 

 seen in the armature of the swimming feet. The armature is as 

 follows : 



Foot No 



Ramus, Outer or Inner. 



Outer Spines 



Apical Spines 



Apical Seta 



Inner .Seta; 



•'■seta, -setose. 



II 



3 



12 



1 

 3 



III 



IV 



11 

 1 

 1 

 3 



11 

 2 

 

 2 



