On Steno cypris Chevreuxi. 



A Short Account of the various Entomostraca Raised 

 from the Two Samples of Mud. 



Cladocera. 



1. Daphnia magna, Strauss. 



This well-known form developed in great numbers in 

 two of my aquaria, both prepared with mud from the 

 swamp of Bon Kamera. It was watched during 2 or 3 

 successive sexual periods, and in the one aquarium is still 

 living. 



2. Ceriodaphnia reticulata (Jurine). 



This form also developed rather plentifully in one of 

 my aquaria, but the mud from which it was raised belonged 

 exclusively to the other sample, viz., that taken from the 

 swamp of Kharezas. 



3. Ceriodaphnia minor, Lilljeborg. 



Of this species, which is very nearly allied to the 

 preceding one, but of a much smaller size, numerous speci- 

 mens developed in two of my aquaria, both prepared with 

 mud from the Bon Kamera swamp. 



4. Simocephalus vetulus (Müller). 



This well-known form developed very abundantly in 

 one of my aquaria, and was watched during 2 successive 

 sexual periods, male specimens being at the close of each 

 period very numerous. The mud belonged to the sample 

 taken from the swamp of Bon Kamera. 



3 - Arohiv for Math, og Naturv. B. XVIII. No. 7. 

 Trykt den 8de Oktober 1896. 



