590 



FRESH-WATER BIOLOGY 



FIG. 878, B. 



FIG. 878. A, Notommaia aurita 

 Ehr. X2oo. (After Weber.) 

 B, corona. (After Wesen- 

 berg-Lund.) 



FIG. 880. Male of Synchaeta tremula Ehr. 

 X 300. (After Rousselet.) 



FIG. 879. Eosphora digitata 

 Ehrenberg. X 78- (After 

 Weber.) 



FIG. 88i. Notommata FIG. 882. Polyarthra platyptsra 

 torulosia Duj. X 200. Ehr. X 200. (After Weber.) 

 (After Cohn.) 



FIG. 883. Female of Synchaeta FIG. 884. Corona of Synchaeta baltica Ehr. FIG. 885. Anarthra ap- 

 stylata Wierz. X 225. (After seen from above. (After Rousselet.) tera Hood. X 220. 



Rousselet.) (After Hood.) 



