Moina rectirostris Mueller. 
Female with summer ova. 
Portion of the shell near the postero-inferior angle. 
Post-abdomen. | 
Antennule. 
Moina brachiata Jurine. 
Female with summer ova. 
Antennule. The lateral flagellum is omitted. 
Post-abdomen. 
First foot of female. 
Moina paradoxa Weismann. Ordinary form. 
