172 



IOWA ACADEMY OF SCIENCES. 



Family Dapbniidae . 



The species found are as follows: 



Family Sididae .._ J Sida crystallina O. F. M. 



i Dapbnella bracbyura Lie v. 

 " Simocepbalus vetulus O. F. M. 



Sitnocepbalus setrulatus Koch. 



Ceriodapbnia reticulata Jur. 



Ceriodaphnia consors Birge. 



Ceriodapbnia lacustris Birge. 



Scapholeheris mucronata O. F. M. 



Scapboleberis obtusa Schdl. 



Dapbnia byalina Leydig. 



Daphnia kalbergensis Schoedler. 



Dapbnia lial. var., retrocurva Forbes 

 t Dapbnia spF 



Family Macrotbricidae j Macrotbrix laticornis Jur. 



( Iliocryptus sordidus Lieven. 



f Eurycercus lamellatus O. F. M. 

 I Alona spF 



Dunbevedia setiger Birge. 

 I Pleuroxus denticulatus Bii-ge. 

 Family Lynceidae j Pleuroxus procurvatus Birge. 



Cbjdorus sphaericus O. F. M. 



Cbydorus globosus Baird. 



Leydigia quadrangularis Leyd. 



Camptocercus rectirostris Schdl. 



Family Leptodoridae Leptodora byalina Lill j . 



The distribution of the species is given in the table: 



Dapbnella bracbyura. 

 Dapbnia kalbergensis. 

 Dapbnia kal., variety retrocurva. 

 Dapbnia byalina. 

 Ceriodapbnia lacustris. 

 Cbydorus spbaericus. 

 Cbydorus globosus. 

 Leptodora byalina. 



Sida crystallina. 



Ceriodapbnia consors. 



Simocepbalus serrulatus. 

 I Cbydorus sp.'' 



Pleuroxus denticulatus. 

 I Pleuroxus procurvatus. 



f Ceriodapbnia reticulata. 

 Simocepbalus serrulatus. 



Streams near Newell, Iowa \ Simocepbalus vetulus. 



I Scapboleberis mucronata. 

 I Pleuroxus denticulatus. 

 I Cbydorus spbaericus. 



West Okoboji, open lake, from 



six to eight feet below surface- 



West Okoboji, among weeds near 

 shore 



