6oo 



FRESH-WATER BIOLOGY 



FIG. 909. Notops brachionus 

 Ehr. X loo. (After Weber.) 



FIG. 910. Notops pelagicus Jennings. A, side 

 view; B, Corona. X 4o. (After Jen- 

 nings.) 



FiG.gi i .A napus ovalis 

 Bergendal. X 240. 

 (After Weber.) 



FIG. 912. A, Notops clavulatus Ehr. X 100. 

 (After Hudson and Gosse.) B, Corona. 

 (After Jennings .) 



FIG. 913. A and B, Forms of Anuraea cochlearis Gosse. 

 A, variety macracantha. B, Variety tecta. X 300. 

 (After Lauterborn.) C Male of Anuraea brevis- 

 pina Gosse. 



