S98 



FRESH-WATER BIOLOGY 



Fig. 905. Polychaetus coUinsii 

 Gosse. X 250. (After 

 Teunings.) 



B 



Fig. go6. Eydatina ssnta Ehr. A^ Dorsal view of female 

 X ISO- (After Weber.) B, Corona. (After Wesenberg 

 Lund.) C.Trophi. (After Weber.) 



Fig. 907. Cyrlmia tuba 

 Ehrenberg. X 200. 

 (After Rousselet.) 



Fig. 908. Triphylus lacustrk Ehrenberg. X 134. (After Westen.) 



