Trans. Wis. Acad., Vol. XI. 



Plate XXXIX. 



40 50 60 70 80 90 100* 



15 m 



18 m 

 Fig 



29— Summer distribution, 1896. Diaptomus, Cyclops, D. hya- 

 lina. See p. 394. 



D. hyalina t m ___ . . . . __ 



Cyclops ^_^___^^__ 



Diaptomus — _ __ _ 



