PLATE N. 



Fig. 1-4. DapJinia 2^ulex, var. nasutus. 



Fig. 5. outline of head and (a) beak of D. similis; 



Fig. 6. Leptodora hyalina, seen from above. 



Fig. 7. " '' larva. 



Fig. 8, Latona setifera, female. 



Fig. 9. Limnosida frontosa, female. 



Fig. 10. " " antennule of male. 



Fig. 11. Holopedium gibberwn, female. 



Fig. 12. Sida elongata, head outline. 



Fig. 13. Sida crystallina, head outline of young female. 



Fig. 14. " "' antennule of male. 



Fig. 15. '' " " of female. 



Fig. 16. Daphnia galeata, outline of head. 



Fig. 17. " 'hitrea'' " " " 



