'— 26 — 



Moina hartwigi Weltn. The number of denticles on the 

 dorsal margin of the cauda is 5 — 8. 



Bosmina longirostris m. cornuta J u r. presents a typical 

 form. The variety similis is identical to Bosmina stulihnanni 

 which was described by Weltner from the lake Victoria 

 Nyanza. The form of the 1 — st pair of antennae, the hollows 

 on the forehead at the bases of the antennae, and the form 

 of the valves vary (fig. 9 — 10). 



Alona piilcheUa King is nearer to A. rectangula than to A. 

 guttata, especially if to compare the males of these forms. 



Alona rectangula var. recta^igula G. 0. Sars is found in 

 the typical form. The variety bucobensis Weltn. presents a 

 very insufficiently studied form. 



Alonella excisa is quite similar to the European form. 



Chydorus barroisi Rich. This form resembles the genus 

 Alonella but we are leaving it provisionally in the genus 

 Chydorus. 



Chydorus sphaericiis 0. S. M. All the specimens that were 

 at my disposal were elongated, and coloured yellowish. 



It must be marked that in the pelagic zone of Victoria 

 Nyanza was found one species of the genus Moina; whereas 

 all the European representatives of this genus inhabit the 

 littoral zone and small basins. 



