PLATE I. 



Camptocercus rectirostris^ post-abdomen of female. 



do. post-abdomeu of male. 



do. male. 



Camptocercus biserratus, head. 



Camptocercus latirostris, head of male. 



do., head of female, 



Camptocercus lilUjehorgii^ head. 



do., post-abdomeu of female. 



Acroperus leucocephalus, post-abdomen of male. 



Acroperus angustatus, '^ '' 



Alona temiicaudis, post-abdomen. 



Alona dentata, post-abdomen. 



do. female. 



Alona elegans. 



Alona intermedia. 



Pleuroxus hastatns. 



Leptorhynch us falcatus. 



Phrixura rectirostris. 



Eurycercus lamellatus, first foot of female, 



Alona sanguinea? shell markings. 



Monospilus dispar; 21a. do., head seen from in front. 



Figures 19-21 original, others from Kurz, P. E. Mueller and Schoedler. 



