On Fresh-ureter Crustacea. By Robert Harney. 277 



List of species : — 



Daphnia magna Strauss. 

 Ceriodaphnia dubia Eich. 

 Alona elegans Kurz. 

 Dunhevedia crassa King. 

 Chydorus letourneuxi Kich. 

 Cyclops prasinus Fisch. 

 C. diaphanus Fisch. 

 C. bicuspidatus var. lubbochi Brady. 

 Branchipus pisciformis Schaeff. 



3. Beni Mora pond. — This is a large shallow pond with little 

 vegetation close to the racecourse at Beni Mora, on the north-west 

 of Biskra. 



List of species : — 



Daphnia magna Strauss. 



Macrothrix hirsuticomis Norm, and Brady. 



Alona elegans Kurz. 



Cyclops diaphanus Fisch. 



C. bicuspidatus var. lubbocki Brady. 



Diaptomus wierzejskii Bich. 



Branchipus pisciformis Schaeff. 



About six kilometres west of Biskra is the hot spring of 

 Hammam Salahin, and in its neighbourhood are two crater-like 

 depressions full of highly saline water. The water is said to be 

 of the same nature as that of the springs supplying Biskra, but 

 concentrated by evaporation, and might have been expected to 

 contain Entomostraca. However, neither here, nor in any other 

 saline water in the neighbourhood, did I find any trace of Ento- 

 mostraca of any kind. In one of these " crater lakes " a few 

 Coleoptera, Mollusca, and the fish Cyprinodon fasciatus Val., 

 which also lives in the hot water flowing from the baths, were 

 found. The water was rich in Diatoms, the following species 

 having been identified by Mr. Morland, to whom I wish to express 

 my thanks : — 



Surirclla striatula Turpin. 

 Pleurosigma elongatum Smith. 

 Synedra tabulata Kutz. 



The Kotifer Notholca striata (kindly identified for me by Mr. 

 Kousselet) also occurred in some numbers. This Piotifer and all 

 the Diatoms are species characteristic of brackish water. 



Sources cVOumach — -The springs which supply the oasis of 

 Oumach rise about 10 kilometres south-west of Biskra and about 



