COLD SPRING HARBOR MONOGRAPHS. VII. 



THE FRESH WATER CYCLOPS OF LONG ISLAND. 



E. F. BYRNES. 



LIST OF PLATES. 



PLATE I. CYCLOPS ATER. 

 Camera Drawings. Leitz. 



Fig. I. An adult female, showing the general proportions of the body, the 

 antennae and the caudal stylets. 



Fig. 2. Tlie receptaculum seminis of Fig. i. 



Fig. 3. The rudimentary fifth foot of Fig. i. 



Figs. 4, 5, and 6. Three spines from the swimming feet, showing variation 

 in the form of the spines. Fig. 6 represents the transition of a spine into a 

 seta. 



PLATE IL CYCLOPS SIGNATUS (Coronatus). 



Camera Drawings. Leitz. 



Fig. I. An outline showing the general proportions of the body in an adult 

 female as seen from the side. 



Fig. 2. The outline of an adult male. 



Fig. 3. The antennule of Fig. i, showing the short second segment, which 

 is characteristic of the variety, coronatus. 



Fig. 4. The two distal segments of the antenna of Fig. i, showing the 

 formation of serrations in the hyaline knife edge on the last segment. These 

 serrations are considered characteristic of the variety. 



Fig. S. The rudimentary fifth foot of Fig. i, with its square basal seg- 

 ment, characteristic of the variety. 



Fig. 6. The caudal stylet showing the characteristic hairs on the inner 

 margin. 



Fig. 7. The outer and inner rami of the fourth pair of swimming feet. 



PLATE in. CYCLOPS SIGNATUS (Coronatus). Young Forms. 



Camera Drawings. Leitz. 



Fig. I. A young form showing the general proportions of the body, the 

 antennas and the caudal stylets. The antennae contain but eleven segments. 

 The almost uniform size of the abdominal segments indicates immaturity. The 

 characteristics of the variety, coronatus, are indicated in the short second 

 joint of the antennule and in the presence of a fringe of hairs on the inner 

 margins of the caudal stylets. 



