258 J. G. DE Man: Caridina nilotica. [Vol. II, 



a. Dactylus of 3rd pair of legs 



always longer than i of the 

 propodite (number indicat- 

 ing the proportion between 

 the length of both joints 

 varying between 3" 3 and 

 4*6) ; dactylus of 5th pair 

 also longer than | of the 

 propodite (the number of 

 proportion varying be- 

 tween 2*87 and 4'5). 



b. Number indicating the pro- 



portion between length and 

 breadth ^ of the dactylus of 

 3rd pair less than 4. 



c. Number indicating the pro- 



portion between length and 

 breadth of the dactylus 

 of 5th pair varying between 

 4 and 4'6 ; dactylus of 5th 

 pair with 40 — 50 spinules. 



d. ova 0'7 — 0*86 mm. long . . nilotica (Roux). 

 dd. ova 0*42 — 0*46 mm. long . . natalensis , nov. 

 cc. Number indicating the pro- 

 portion between length and 



breadth of the dactylus of 

 5th pair varying between . 



4'6 and 6*2; dactylus of ' - 



5th pair with 60 — 74 spi- 

 nules ; ova 0*96 — I -06 mm. 



long. . . , . paucipara, M. Weber. 



bb. Number indicating the pro- 

 portion between length and 

 breadth of the dactylus of 

 3rd pair usually larger than 

 4, of 5th pair varying be- 

 tween 5 and 6. 



e. Number of proximal teeth of 



the upper margin of the 

 rostrum usually varying 

 between 12 and 20 ; ova 

 usually o'35 mm, long, their 

 length varying between 

 0'33 and 0*4 mm. .. var. gracilipes, deM. 



ee. Number of proximal teeth of 

 the upper margin of the 

 rostrum usually varying 



1 The breadth of the dactylus is measured at the level of the ist lateral 

 spiuule. 



