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



Though it has been fully described in my work of 1892, I wish 

 to add the following : In this work, p. 390, the fingers of the first 

 legs are said to be about once and a half as long as the palm ; this 

 observation, probably made by means of a feeble magnifying-glass, 

 proved to be erroneous. Four adult ova-bearing females, co- types 

 of the specimens described in 1892 and taken out of Prof. Weber's 

 collection, have now been exactly measured under the microscope, 

 (Table G) : the fingers of the ist pair now appear to be 2 — 2*5 

 times as long as the palm. The carpus of the 2nd legs appears in 

 some specimens very slender (six times as long as thick distally) 

 (Table G, No. 3), but in other individuals it presents the same form 

 as in the typical nilotica from the Nile and as in the var. longi- 

 rostris. The fingers of the 2nd chelae now prove also to be more 

 than twice as long as the palm. 



There is no spine on the ischial joint of the three posterior 

 legs. The meropodites of the 3rd legs are armed with 3 spines ; 

 the 2nd spine is placed just beyond the middle, the ist midwa}^ be- 

 tween the 2nd and the proximal extremity of this joint or somewhat 

 nearer to the 2nd spine, the 3rd near the distal extremity. Carpus 

 with a spine near the far end. The dactyli measure about j the 

 length of the propodite. 



The meropodites of the 5th legs carry one spine near the distal 

 extremity, as also their carpus ; the dactyli are also short, measur- 

 ing ^ — I the length of the propodite. 



Quite characteristic is the stout shape of the dactyli of the three 

 posterior legs, though it ought to be remarked that the shape of 

 those of the 3rd legs is somewhat variable {cf. Nos. i and 4 of 

 Table G). 



The eggs are very numerous and small, 0*39 — 0*44 mm. long 

 and 0*22 — 0*25 mm. broad, presenting nearly the same size as those 

 of the var. bengalensis and natalensis. Nine eggs of the female 

 No. I fromMbawa, Flores, show the following measurements: 0*39 

 mm. X 0*23 mm. ; 0-4 mm x 0*23 mm. ; 0-4 x 0*24 mm. ; 0*41 x 0''22 

 mm.; 0'42 x 0*23 mm.; 0*42 >^ 0*24 mm.; 0*42 x 0*25 mm.; 0'43 

 xo"23mm. ; 0*44 x 0*24 mm. 



8. Caridina nilotica (Roux), var. gracilipes, de M. 



Table H. 



(Plate XX, figs. 7, ya, yh.) 



Caridina wyckii, Hickson, var. gracilipes, de Man, Ix., 1892, 

 p. 393, tab. xxiv, figs, 29 a — e. 



This variety, which inhabits the islands of Celebes and Saleyer, 

 is chiefly characterised by the slender dactyli of the three posterior 

 legs, by the carpus of the ist legs being twice or a little more than 

 twice as long as broad, by the shape and toothing of the rostrum and 

 by its small eggs, which are usually 0*35 mm. long. Three co-types, 

 adult ova-bearing females, from Maros, Celebes, are measured on 

 Table H. In two of the three the fingers of the ist chela appear 



