PLATE N. 



Fig. 1-4. Daphnia jmlex, var. nasutiis. 



Fig. 5. outliue 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. " " auteunule of male. 



Fig. 11. Holopedium gibherum, female. 



Fig. 12. Sida elongata, head outline. 



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



Fig. 14. " '' antennule of male. 



Fig. 15. '' " '' of female. 



Fig. 16. Daphnia galeata, outline of head. 



Fig. IT. '' ''vitrea'' " ''' " 



