BYRNES: CYCLOPS OF FRESH WATER. 4I 



Fig. 8. The second and third segments of the outer ramus of the fourth 

 swimming foot of Fig. 5, showing the small proximal spine. 



Fig. 9. The rudimentary fifth foot of the "parcus-stage" of C. brevi- 

 s initios us. 



PLATE VIII. CYCLOPS INGENS (?) 

 Camera Drawings. Leitz. 



Fig. I. A typical though greatly enlarged Cyclops of the viridis type, hav- 

 ing the complete armature of Cyclops brcvispinosus. 



Fig. 2. Three segments of the outer ramus of the fourth swimming foot 

 of Fig. I, with the three characteristic spines on the outer margin of the 

 distal segment. 



Fig. 3. A form resembling Fig. i in size, proportions and color, but differ- 

 ing from it in the armature of the swimming-feet. Fig. 3 contains a parasite. 



Fig. 4. Three segments of the outer ramus of the fourth swimming foot 

 cf Fig. 3, with two spines on the outer margin of the distal segment. I have 

 designated this form the "parcus-stage" of brcvispinosus. 



PLATE IX. CYCLOPS VIRIDO-SIGNATUS. New Species. 

 Camera Drawings. Leitz. 



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

 The antennae contain twelve segments and reach barely to the posterior 

 margin of the cephalo— thorax. There is no evidence of further segmentation 

 in the antennae. Maturity is indicated by the great elongation and lateral 

 enlargement of the first abdominal segment. The caudal stylets are pro- 

 fusely hairy. The stylets are armed as in the typical parens forms. 



Fig. 2. An adult male, showing geniculate antennas. 



Fig. 3. A young form having ten antennal segments and two-jointed rami 

 in the swimming feet. 



Fig. 4. A lateral view of Fig. 3. 



Fig. 5. The rudimentary fifth foot of Fig. I. 



Fig. 6. The rudimentary fifth foot of Fig. 3. 



Fig. 7. The labrum of Fig. i, showing eight coarse teeth. 



Fig. 8. The receptaculum seminis of Fig. i. 



PLATE X. CYCLOPS PULCHELLUS. Herrick. 



Camera Drawings. Leitz. 



Fig. I. A mature female, showing the general proportions of the body. 



Fig. 2. The fifth foot of Fig. i. 



Fig. 3. The receptaculum seminis of Fig. i. 



CYCLOPS BICUSPIDATUS. Forbes. 



Fig. 4. An adult female C. bicuspidatis having seventeen segments in the 

 antennae. 



