40 COLD SPRING HARBOR MONOGRAPHS. VII. 



CYCLOPS BREVISPINOSUS. Herrick. Young Form. 

 Camera Drawings. Leitz. 



Fig. 4. An outline of a young cyclops illustrating the general proportions 

 of the body. Antennae nine-jointed. 



Figs. S, 6, and 7. Outlines of the outer rami of the first, second and third 

 swimming feet, when they contain but two segments. 



Fig. 8. Outline of the outer and inner rami of the fourth swimming feet. 

 The fourth feet develop more slowly than the more anterior appendages, but 

 the characteristic outer spine on the distal segment of the inner ramus is 

 already present. Both rami are unsegmented. 



PLATE VL CYCLOPS PAROUS. Hkrrick. 

 Camera Drawings. Leitz. 



Fig. I. The outline of an adult female, showing the general proportions 

 of the body. The antennse contain seventeen segments. Maturity is indicated 

 by the greatly enlarged first abdominal segment, as well as by the presence 

 of the appended ova. 



Fig. 2. The outline of an adult male. 



Fig. 3. The fourth pair of swimming feet of a male. Both the inner 

 and outer rami are three-jointed. 



Fig. 4. The rudimentary fifth foot of the female shown in Fig. i. 



Fig. 5. The side view of an adult female. 



Fig. 6. The dorsal view of the abdomen and caudal stylets of Fig. 5. 



Fig. 7. The rudimentary fifth foot of Fig. 5, showing a broad flat spine in 

 place of the usual short blunt one. 



Fig. 8. The receptaculum seminis of Fig. 5, seen in outline from the 

 ventral view. 



PLATE VIL CYCLOPS BREVISPINOSUS. Herrick. 

 Camera Drawings. Leitz. 



Fig. I. An adult female drawn from the dorsal side and illustrating the 

 general proportions of the body. 



Fig. 2. The outer and inner rami of the fourth pair of swimming feet 

 of Fig. I, showing the characteristic outer spines on the distal segment of 

 the outer ramus and the single outer spine on the distal segment of the inner 

 ramus. 



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



Fig. 4. The receptaculum seminis of Fig. i. 



Fig. 5. A young female brevispinosus, having but eleven segments in the 

 antennae, and abdominal segments of uniform size. 



Fig. 6. The rudimentary fifth foot of Fig. 5. 



Fig. 7. The second and third segments of the outer ramus of the fourth 

 swimming foot of C. brevispinosus in the "parcus-stage," showing but two 

 outer spines in place of three. 



