PLATE F. 



Fig. ]. Chijdorus globosus. 



Fig. 2. do., first foot. 



Fig. 3. do., eud of post-abdomen. 



Fig. 4. Chydorns spliicricus^ mdXc. 



Fig. 5. Chydonis nitidus, post-abdomen of female. 



Fig. 6. Chydorus nitidus, head. 



Fig. 7. Chydorus spluericus^ ephippial female. 



Fig. 8. do., female. 



Fig. 9. Chydorus globosus, post-abdomen of male. 



Fig. JO. Chydorus sphxrricus^ from above. 



Fig. 11. Chydorus oralis. 



Fig. 12. Chydorus ccdatus. 



Fig. 13. Crepidocercus setiger. 



Fig. 14. Alona offinis. 



Fig. 15. Pleuroxus unidens; 15a. antenna. 



