26 Mr. R. Gurney on some Freshwater 



features of the country, it is remarkably uniform in distri- 

 bution. The long, unvaried, valley of the Nile seems, both 

 for the fauna and the flora, to effect a transition between 

 the Ethiopian and the Palsearctic regions, and to produce a 

 uniformity vrhich can rarely be met with in other parts of 

 the world. Such a uniformity with regard to the Ento- 

 niostraca is only to be expected, since all the water of the 

 country is supplied from the same source, and the majority 

 of the smaller pools are only temporary, drying up in the 

 summer. Where there are permanent pools of water in 

 which there is vegetation the fauna is more varied, but, on 

 the whole, the species are evenly distributed. 



List of Species. 



(1) Diapkanosoma brachjurum, Lievin. 



Abundant in pools by the road to the Pyramids of Gizeh, 

 and also found in a canal at Lecht. A few males were 

 found among the specimens taken on Feb. 15 in the former 

 place. 



(2) Diapkanosoma excisum, Sars. 



A number of specimens of this species were found in the 

 collections from the Blue and the "White Nile. Ekman 

 (1901) has described a variety (var. longiremis) from the 

 White Nile which differs from the type in the greater length 

 of the antennae and the presence on the postabdomen of a 

 few short hairs. My own specimens have the shorter an- 

 tennae of the type, but the same hairs on the postabdomen 

 as Ekman describes. 



(3) Daphnia lumholtzi, Sars, 



A few specimens, including males and ephippial females, 

 were taken in a pool near the Pyramids, and ephippia which 

 I refer to this species were found in a pool at Dahchonr. A 

 single adult specimen, somewhat decayed, was found in the 

 Nile at Luxor. 



(4) Daphnia longispina, O. F. M. 



Pools near the Pyramids, pool at Dahchour, and in the 

 Nile at Kons. 



(5) Daphnia longispina, var. cucullata, Sars. 



I have a rough drawing by my brother of a species of 



