PLATE XXII. 



Cyclops serrulatus. 



Fig. 1. Posterior antenna. 



2. Mandible and palp. 



3. Anterior foot-jaw. 



4. Posterior foot-jaw. 



5. Foot of fifth pair. 



6. Caudal segments. 



Variety of same. 



7. Female seen from above. 



8. Anterior antenna of same. 



9. Mandible. 



10. Maxilla. 



11. Anterior foot-jaw. 



12. Foot of first pair. 



13. Fourth foot ; last joint of outer branch. 



14. Foot of fifth pair. 



Cyclops Helleri.* 



15. Anterior antenna of female. 



16. Anterior antenna of male. 



17. Foot of fifth pair. 



18. Abdomen and caudal segments of male. 



* In inscription of Plate XXII, for Clausii, read Helleri. 



