Daphnia pulex var. nasutus. 
‘¢ similis. Outline of head and (a) beak. 
Leptodora hyalina. Seen from above. 
vf hyalina. Larva. 
Latona setifera. Female. 
Limnosida frontosa. Female. ; Seay 
ms frontosa. Antennule of male. 
Holopedium gibberum. Female. 
Sida elongata. Head outline. 
‘‘ erystallina. Head outline of young female. 
“ erystallina. Antennule of male. 
‘ erystallina. Antennule of female. — 
= hyalina) “D. galeata.” Outline of head. 
he “DD. vitrea.” Outline of head. 
