Land & Fresh-water Mollusca. 13 



14. Succinea rugulosa Morelet. 



Alt. 4,2 mm. Lat. 2,5 mm. 



Hab. Gebel Ahmed Aglia (The White Nile). On water- 

 plants. Two living specimens. 



Geographical distribution: 

 Countries northeast of Abyssinia: Aillet (Schiller ace. to v. 

 Martens [74]), Keren (Beccari ace. to Morelet [94]), Genda, 

 Asmara, Mekerka (Jickeli [50]). 



This species is consequently new for the White Nile. 

 Literature: 



1) Succinea rugulosa Morelet 94 (p. 192, pi. 9, f. 7), 54 (p. 168, T, 2, 

 f. 9, T. G, f. 12). 2) Succinea badia v. Martens (non Morelet) 74 (p. 210), 50 

 (p. 30, 37, 40). 



15. Corbicula fluminalis (Muller). 



a) var. cor. Lamarck. 



Long. 26 mm. Lat. 26,5 mm. Crass. 15 mm. 



Hab. 1) Mahmudia (the White Nile) (40 Engl, miles south 

 of Omdurman). On the depth of one metre, muddy bottom. 

 Several specimens without the animals ; 2) El Gerassi (the White 

 Nile) (60 Engl, miles south of Khartoum). One specimen; 3) Six 

 living specimens from some place not mentioned on the White Nile. 



The shell is considerably inflated. Umbo lies nearer to the 

 hind than to the front edge of the shell. Ribs very conspicuous. 

 The colour is an olive brown, very little glossy. — Some spe- 

 cimens from Mahmudia differ from the general type in as for 

 as the ventral border of the shell is irregularly bent inward. 



b) var. consobrina Caillaud. 



Long. 19,5 mm. Lat. 18,5 mm. Crass. 15 mm. 



Hab. El Gerassi (the White Nile). Two dead, well pre- 

 served specimens. 



Shell a trifle inflated. Umbo lies nearer to the front than 

 to the hind edge of the shell. The colour is a yellowish green, 

 more glossy than in the preceeding variety. 



Geographical distribution (of the whole species): 



Lower Egypt (Caillaud [16], Ehrenberg and Hemprich [32], 

 Diktrich ace. to Merian [90], Zelebor ace. to v. Martens [71], 



