Chydorus globosus. 



Fig. 



1. Side view. 



2. First foot. 



3. Ead of post-abdomen. 



4. Chydorus sphaericus. Post- abdomen of male. 



5. " iiitidus. Post-abdomen of female. 



6. " nitidus. Head. 



7. " sphaericus. Ephippial female. 



8. " sphiericus. Female. 



9. " globosus. Post-abdomen of male. 



10. " splijericus. From above. 



11. " ovalis. 



12. " caelatus. 



13. Dmilievidia setiger. 



14. Alona afflnis. 



15. Pleuroxus gracilis. 



15a. " gracilis. Antenna. 



