172 



IOWA ACADEMY OF SCIENCES. 



The species found are as follows: 



Family Sididae... 3 ^^'^^ crystallinaO. F. M. 



( Daphnella brachyura Liev. 



Simocephalus vetulas O. F. M. 



Simocepbalus serrulatus Koch. 



Ceriodapbnia reticulata Jur. 



Ceriodaphnia consors Birge. 



Ceriodapbnia lacustris Birge. 

 Family Dapbniidae - --- J Scapholeberis mucronata O. F. M. 



Scapholeberis ohtusa Schdl. 



Dapbnia byalina Leydig. 



Dapbaia kalbergensis Schoedler. 



Dapbnia kal. var., retrocurva Forbes 

 [ Dapbnia sp? 



Family Macrotbricidae 



Macrotbrix laticornis Jur. 

 Iliocryptus sordidus Lieven. 



M. 



Family Lynceidae 



{ Eurycercus lamellatus O. F. 

 I Alona sp? 



Dunbevedia setiger Birge. 



Pleuroxus denticulatus Birge. 

 { Pleuroxus procurvatus Birge. 



Cbydorus spbaericus O. F. M. 



Cbydorus globosus Baird. 



Leydigia quadrangularis Leyd. 



Camptocercus rectirostris Schdl. 



Family Leptodoridae Leptodora byalina Lillj . 



The distribution of the species is given in the table: 



Daphnella bracbyura. 

 Dapbnia kalbergensis. 

 Dapbnia kal. , variety retrocurva. 

 Dapbnia byalina. 

 Ceriodapbnia lacustris. 

 Cbydorus spbaericus. 

 Cbydorus globosus. 

 Leptodora byalina. 



Sida crystallina. 

 Ceriodapbnia consors. 

 Simocephalus serrulatus., 

 Cbydorus sp.'' 

 Pleuroxus denticulatus. 

 Pleuroxus procurvatus. 



( Ceriodaphnia reticulata. 

 Simocepbalus serrulatus. 



Streams near Newell, Iowa ] Simocephalus vetulus. 



Scapholeberis mucronata. 

 Pleuroxus denticulatus. 

 Cbydorus spbaericus. 



West Okoboji, open lake, from 



six to eight feet below surface . 



West Okoboji, among weeds near 

 shore 



