310 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
CYCLOPIDAE. 
Cyclops signcitus var. coronatus Koch. Kettleholes. 
Cyclops signcitus var. tenucornis Koch. Kettleholes. 
Cyclops insignia Claus. West Okoboji Lake. 
Cyclops serrulatus Fischer. Marble Lake. 
Cyclops macrurus Sars. Marble Lake. 
Cyclops fluviatilis Herrick. Very abundant everywhere. 
Cyclops affinis Sars. West Okoboji Lake. 
Cyclops bicolor Sars. Kettleholes. Abundant. 
Cyclops phaleratus . Koch. Very abundant in kettleholes and lakes 
Cyclops fimbriatus Fischer. Very abundant in lakes. 
Laboratories of Animal Biology, 
The State University. 
