BYRNES: CVCI.OPS OF FRESH WAIER. 23 



Cyclops Virido-Signatiis (Plate IX.). New Species. 



This Cyclops, figured on Plate IX., seems to be an unnamed form 

 peculiar to its locality. It was taken from a sphagnum swamp at 

 Jamaica, Long Island, and was so abundant in that locality that 

 adult males and females were taken in a single collection, together 

 with the later stages of the young. Although frequent collections 

 had been made from this locality in previous years tlie form had 

 not been previously encountered there. Accompanying it were 

 several Cyclops of the znridis type, especially C. Americaniis, Marsh, 

 which it resembles in color and in general appearance. The out- 

 line of the body of this form is shown in Fig. i, Plate IX., in an 

 adult female in which the antennae contain only twelve segments. 

 There was no sign of further segmentation in the segments of these 

 antennae, although the hairs on the longer segments occupied such 

 positions that, should the segments break up into smaller ones at the 

 level of the hairs, seventeen segments could arise with an armature 

 corresponding very closely to the usual armature of a typical seven- 

 teen -jointed antenna. 



The labrum carries only eight large teeth on a narrow plate. 

 The abdomen contains five segments in the male and four in the 

 female. The caudal stylets are profusely covered with hairs over 

 the entire surface. The stylets carry but two long set?e as in the 

 z'iridis type, but even the short hairs are strongly setose. The 

 armature of the swimming feet agrees with that of C. parens, as 

 follows : 



Foot No 



Ramus, Outer or Inner 



Outer Spines 



Apical Spines 



Apical Set;e 



Inner Setre 



II 



III 



IV 



11 



iseta 



The fifth feet are two-jointed, having a basal segment broader than 

 long and carrying an outer seta, and an almost square distal seg- 

 ment having a median plumose seta and two very short blunt spines, 



