264 j. G. DE Man: Caridina nilotica. [Voiv. Il, 



proximal extremity, the 3rd near the far end. Carpus with a 

 spine near the distal extremity. The ischium of the 5th legs is 

 unarmed, the meropodite carries two spines, the ist nearer to the 

 distal than to the proximal extremity, the 2nd near the distal end. 

 Carpus also with a spine near the distal extremity. Another co-type 

 (No. 4) agrees as regards the armature of ischium and meropodite 

 with the preceding specimen. 



According to Weber's description the dactylus of the 3rd and 

 4th pairs should measure about 4, that of the 5th i of the pro- 

 podite : in the co- types measured on Table D, these dactyli appear 

 a little longer. 



The eggs (fig. 46) are few in number and the largest of all 

 the other varieties : they are 0*96 — i"o6 mm. long and 0*55 

 — 0*67 mm. broad. Nine eggs of No. i presented the following 

 measurements : 0*96 x 0'6 mm. ; 0*97 x 0*62 mm. ; 0*98 x 0*62 mm. ; 

 0-98 X 0'67 mm, ; i x o"62 mm. ; i'02 x 0*62 mm. ; i"02 x 0"63 mm. ; 

 i'02Xo64 mm.; 1*05 xo"6 mm. Four eggs of female No. 3 

 presented the following measurements: i' 1x0*64 mm.; i'04 

 X 0*64 mm. ; 1*04 x 0"65 mm. ; i'o6xo-62 mm. ; and the measure- 

 ments, finally, of four eggs of No. 4 were 0*96 x 0'55 mm. ; 0*97 

 xo"58 mm. ; 0*98 x 0*59 mm. and 1x0*58 mm. 



4. Caridina nilotica (Roux), var. longirostris, H. M. Bdw. 



Table E 

 (Plate XX, figs. 5, 5a, jb.) 



Caridina longirostris, H. Milne Edwards, Hist. Nat. Crust., 

 ii, 1837, P- 363 ; de Man, I.e., 1892, p. 396, tab. xxiv, fig. 29/, 

 29m, 29 mm; Bouvier, I.e., 1905, p. y8. 



The 20 specimens, co-types, of Car. longirostris from the river 

 Macta, Oran, that are lying before me are the same that were 

 examined and figured by me in 1892. Ten have been measured 

 (Table E). This form proved to be quite different from the 

 Eg3'ptian typical species ; it ma}'' at once be distinguished by its 

 much smaller eggs (fig. 5&), which are as small as those of the 

 varieties gracilipes, de M., and brachydactyla, de M., from Celebes, 



being 0*33 0*39 mm. long and o*2i — 0*26 mm. broad. So, e.g., five 



eggs of the female No. 2, which was 18*5 mm. long, presented the 

 following measurements : 0*35 x 0*21 mm. ; 0*38 x 0*24 mm. ; 0*38 x 

 0*25 mm. ; 0*38 x 0*26 mm. ; 0*39 x 0*23 mm. ; and five eggs of the 

 female No. 7, 16*5 mm. long, the following: 0*33 x 0*23 mm.; 

 0*34 X 0*23 mm.; 0*36x0*23 mm.; 0*36x0*24 mm.; 0*37x0*25 

 mm. 



The toothing-formulae of the rostrum of three specimens that 

 are not in the Table are as follows : — 



15' + I _ i8'^ + i 19'V I 



13 ' 14 ' 15 ' 



and in these specimens the proportion between the length of the 



