XXVIII. ON CARIDINA NILOTICA fROUX) 

 AND ITS VARIETIES. 



By Dr. J. G. de Man, lerseke, Holland. 



The collection of Crustacea obtained from brackish water ponds 

 at Port Canning, I^ower Bengal, which is described at p. 211 of this 

 Journal, comprised also very numerous specimens of a variety of 

 Caridina nilotica (Roux) which proved to be new. As our know- 

 ledge of this species and its varieties appears still much confused 

 and unsatisfactory, the present paper will, I think, be welcome. 



The typical species, Caridina nilotica (Roux) from the Nile, 

 was described by Roux, as a Pelias, in the Annates des Sciences 

 Naturelles, t. xxviii, 1833, p. 73, pi. 7. 



Compare the following papers : — 



Hickson^ S. /., On a new Species of the genus Atya {A. wyckii) 

 from Celebes, in : Annals and Magaz. of Natural History for Nov. 

 1888, p. 357, pis. xiii, xiv. 



de Man, J . G., in : Max Weber's Zoolog. Ergebnisse einer 

 Reise nach Niederl. Ost-Indien, ii, 1892, p. 386, pi. xxiv, figs. 

 29, 29 k. 



Max Weber, Zur Kenntniss der Siisswasser-Fauna von Siid- 

 Afrika, in : Zoolog. Jahrbiicher (Spengel), Abth. f. System, x, 

 1897, p. 168. 



Schenkel, E., in : Verhandl. der Naturf. Gesellschaft in Basel 

 xiii, 1902, Heft 3, pp. 497-499. 



de Man, J. G., in : Abhandl. der Senckenberg. Naturf. 

 Gesellschaft, xxv, 1902, p. 895. 



Bouvier, E. L., in : Bulletin Scientif. de la France et de la 

 Belgique, t. xxxix, 1905, pp. 78-80. 



Caiman, W. T., in : Proceed. Zoolog. Soc. London, 1906, vol. i, 

 p. 189. 



The following material lies before me : — 



1. Twenty-three specimens, some of which are adult and 



egg-bearing, collected, December 1903, in ponds and 

 « canals near Cairo, Egypt, and presented to me by 



Capt. S. S. Flower, Director of the Zoological Gardens 

 at Giza, near Cairo, January 1904. 



2. Twenty specimens, some of which are egg-bearing, of 



Caridina longirostris , H. M. Edw., from the river 

 Macta, near Oran, co-types, received in 1890 from the 



