Daphnia pulex var. nasutus. 
oe similis. Outline of head and (a) beak. 
Leptodora hyalina. Seen from above. 
- hyalina. Larva. 
Latona setifera. Female. 
Limnosida frontosa, Female. 
e 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. ; 
(Daphnia hyalina) “PD. galeata.” Outline of head. 
ra 1). vitrea.” Outline of head. 
