PLATE :N^, 



Daphnia jyulex, var. nasutus. 



outline of head and (a) beak of D. similis. 



Leptodora hyalina^ seen from above. 



larva. 

 Latona setifera^ female. 

 Limnosida frontosa^ female. 



*' '' antennule of male. 



Holopediiim gibberum, female, 

 Sida elongata, head outline. 

 Sida crystallina, head outline of young female. 

 " '' antennule of male. 



of female. 

 Daphnia galeata^ outline of head. 

 Fig. 17. " ''vitrea'' " '' " 



Fig. 



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T. 



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16. 





