IOWA ACADEMY OF SCIENCES. 
17a 
West Okoboji, fifteen to twenty 
feet below surface 
East Okoboji, surface 
f Daphnella bracbyura. 
Daphnia kal , variety retrocurva. 
Simocephalus serrulatus. 
Ceriodaphnia consors. 
< Eurycercus lamellatus. 
Danhevedia setiger. 
Cbydorus spbaericus. 
Cbydorus globosus. 
Camptocercus rectirostris. 
Sid a crystallina. 
Ceriodapbnia reticulata. 
Ceriodapbnia consors. 
Dapbnia kal . , variety retrocurva. 
Dapbnia byalina 
Macrotbrix laticornis. 
Eurycercus lamellatus. 
Cbydorus spbaericus. 
Leydigia quadrangularis. 
Spirit Lake, ten to fifteen feet 
below surface 
Raccoon River, Adel, Iowa 
r 
1 
I 
Dapbnella bracbyura. 
Dapbnia kal . , variety retrocurva. 
Cbydorus spbaericus. 
Ceriodapbnia reticulata. 
Scapboleberis mucronata. 
Iliocryptus sordidus. 
Pleuroxus denticulata. 
Scapboleberis mucronata. 
Simocepbalus serrulatus. 
Raccoon River at Sac City < Cbydorus spbaericus. 
Pleuroxus denticulatus. 
i, Alona sp? 
THE ANATOMY OF SPH^RIUM SULCATUM LAM. 
BY GILMAN A DREW. 
For a number of years the embryology of the Cyrenidee has 
been attracting considerable attention, but little has been 
added to our knowledge of the general anatomy since Dr. 
Franz Leydig’s publication in 1855 (No. 5), who recorded such 
anatomy as could be made out from young and rather trans 
parent specimens.* 
It is my present intention to continue the work here begun 
on Sphserium to a comparative anatomy of the Cyrenidae, but in 
find a reference to a paper by Temple Prime, entitled: Notes on the Anatomy of 
the Oorbiculidee and Translation from the Danish of an article on the Anatomy of 
Oyclas by Jacobson. Bui. Museum Comp. ZooL, Cambridge, Vol. V. This volume 
unfortunately is not to be found in the reference libraries of Baltimore. 
