Entomostraca from Egypt and the Soudan. 27 



Dajjhnia from the White Nile which belongs to the Daphnia 

 cucullata group, and probably represents Z). jardinei, var. 

 barbata, "Weltner. As the specimen is lost I cannot be sure 

 of its identity. 



(6) Slmosa vetula, 0. F. M. 



Zoological Gardens, Cairo ; pools near the Pyramids ; 

 pools at Sakkara and at Tamiah (Faytim). Common. 



(7) Ceriodaphnia reticulata, Jur. 



Pools near the Pyramids and at Dahchour. Specimens 

 taken on March 25, 1907, in the former place bore ephippia. 

 A few individuals possessed the toothed fornix characteristic 

 of the variety serrata. 



(8) Ceriodaphnia rigaudi, Richard. 



Pool by the Pyramids, at Dahchour^ and in the Blue Nile. 

 Hare. 



(9) Ceriodaphnia dubia, Richard. 

 In the Nile at Luxor and Kous. 



(10) Ceriodaphnia quadrangula, O. F. M. 

 Pools by the Pyramids and at Sakkara. 



(11) Bosmina longirostris, O. F. M. 



The typical form of this species appears to be generally 

 distributed and common in pools. The variety corniita 

 occurred in the Zoological Gardens at Cairo in February and 

 in the Nile at Luxor and Kous in March. 



(12) Moina dubia, Richard. (PL II. figs. 1, 2.) 



This species appears to be the commonest plankton Clado- 

 ceran in the Nile valley. It was found abundant in Lake 

 Victoria by Daday, and in the Nile from Omdurman to 

 Assouan by Ekman. My own collections show that it is 

 common in the Blue Nile and in the Nile itself from Khar- 

 toum to below Luxor. 



The specimens taken in the Blue Nile in March 1902 

 include some males and ephippial females. The ephippium 

 is not distinguishable from that of Moina rectirostris, since 

 it has but a single egg-space surrounded by an incomplete 



