1914.] NATURAL SCIENCES OF PHILADELPHIA. 63 



Plate IV. — Figs. 1-4, Cyclops phdlcralus Koch. Figs. 5-11, Cyclops fimbrialus 

 var. poppei Rehberg. 



Fig. 1. — An adult female. Oc. 0, obj. 3. 



Fig. 2. — The stylets and last abdominal segment. Oc. 0, obj. 5. 



Fig. 3. — The female first antenna. Oc. 2, obj. 5. 



Fig. 4.— The fifth foot. Oc. 2, obj. 5. 



Fig. 5. — An adult female; the first ccphalothoracic segment appears some- 

 what foreshortened. 



Fig. 6. — The stylets and last abdominal segment. 



Fig. 7. — The female first antenna. 



Fig. 8. — A foot of the fifth pair. 



Fig. 9. — The receptaculum seminis. 



Fig. 10. — Posterior serrated margin of the third thoracic segment. 



Fig. 11. — Posterior margin of the fourth thoracic segment. 



