262 J. G. DE Man: Caridina nilotica. [Voiv. II, 



of the female No. i are a little smaller than those of the typical 

 form, being o'62 — 07 mm. long and 0*38 — 0*4 mm. broad; the 

 measurements of nine eggs are as follows : 0*62 mm. x 0*38 mm. ; 

 0*62 mm. X 0*39 mm. ; 0*62 mm. x 0*4 mm. ; 0-63 mm. x 0*38 mm. ; 

 0'64 mm. x 0*39 mm. ; o"65 mm. x 0*4 mm. ; 0"66 mm. x 0*38 mm. ; 

 0"68 mm. x 0*4 mm. and 07 mm. x 0*39 mm. 



The measurements of these eggs agree with those indicated by 

 Dr. Caiman (I.e.) for specimens from the same Lake Victoria Nyanza ; 

 also as regards the measurements of the ist legs, his specimens 

 agree with those of Table B, but the dactyli of the three posterior 

 legs are apparently a little shorter in Caiman's specimens. 



2. Caridina nilohca (Roux), var. natalensis, nov 



TABI.E C. 



(Plate XX, figs. 3, 3a, 3&.) 



Prof. Max Weber, in his quoted paper on the freshwater fauna 

 of South Africa, referred numerous specimens collected bj^ him in 

 the rivers of Natal, partly to the typical form of Car. wyckii (Hicks.), 

 partly to a new variety paucipara. A close examination of three 

 adult ova-bearing females from the river Umgeni, — co- types re- 

 ceived from him, — proved, however, that they only differ from 

 the typical species, inhabiting Egypt, by the much smaller size of 

 the eggs, whereas they fully agree with it as regards the measurements 

 of the thoracic legs (compare Table C with Table A). 



According to Max Weber the dactjdi of the 3rd pair should 

 measure •§-, those of the 5th i, of the length of the propodites ; 

 in the three co-types, however, measured on Table C, the dact^di 

 appear distinctly longer. But even when supposing that the dactyli 

 are in other specimens indeed as short as indicated b}^ Prof. Weber, 

 there are apparently still other differences between this Natal 

 variety and the var. brachydactyla, nov., from Celebes. The fingers 

 of the 1st legs are in the females from the river Umgeni about once 

 and a half as long as the palm, but in the var. hrachydactyla ^ twice 

 or more than twice as long ; the fingers of the 2nd legs appear also 

 comparatively^ longer in the var. hrachydactyla than in the var. 

 natalensis. The dact3di of the three posterior legs show a still 

 stouter shape in the Indian variety, and those of the 3rd pair carry 

 only six or seven spines, the terminal claw included, but in the 

 var. natalensis, though sometimes seven, also often eight or nine, 

 as was already indicated by Max Weber. 



The ischium of the three posterior legs appears unarmed in the 

 females from the river Umgeni. The meropodite of the 3rd 

 legs is armed with three spines, the ist just or nearl}^ in the middle 

 of the joint, the 3rd near the distal extremity and the 2nd midwa}^ 

 between the ist and the 3rd, or a little nearer to the 2nd. The 



' Prof. Weber did compare, of course, his Natal specimens with the material 

 described by me in 1892 (/.c.) ; the " typical form " of Car. wyckii appears now as 

 the var. hrachyJ Actyla, 



