MOLLUSCA FROJI THE SOUTHERN SUDAN. 239 



Tawila : eleven all dead, only six in tolerable condition, they are striped 

 and three are bicarinate. 



Hillet Abbas : ten, all decollated, five striped, four bicarinate. 



Masran Island : four, decollated and striped. 



Gebel En : seventy-eight, mostly decollated, thirty-seven with both keels 

 and stripes, eleven unicolorous with keels, generally uncarinate, but a few 

 bicarinate. Twenty-three simply striped. 



Gebel Ahmad Agha : two dead, decollated and striped. 



Kclka : nineteen decollated and some much eroded, all striped and six 

 bicarinate. 



S. of Melut : two dead, striped. 



Lake Shambe : ten, all striped and keeled, the greater number bicarinate. 

 Colour so dark that the stripes hardly show. 



Gondokoro : one alive, more elongated than usual as the whorls are more 

 exsert ; it is decollated, striped, and bicarinate. Alt. 14, diam. 7'5 mm. 

 Whorls five. If this shell were compared with one of the broader forms 

 from Mogran without the intervening links, each would probably be con- 

 sidered a distinct species. 



E-eported from Lower and Upper Egypt, the whole basin of the White 

 Nile up to the Victoria Nyanza ; Abyssinia, Lake Rudolf, Morabassa, 

 Zanzibar, Angola, and Senegal. 



Family AiiPULLARiiDJi:. 



Genus All PULL ARIA. 



Ampullaria kordofana, Phil. 



■ AmpuUaj-ia kordofana, Philippi, 1851, ' Concliyl.-Cab.' ed. 2 : Genus Ampullaria, 

 p. 44, pi. 13. fig. 1. 



About thirty specimens were taken, many of which are immature, and in 

 that state they are difficult to distinguish from A. loernei, Phil. They 

 occurred at Tawila, Kosti, Hillet Abbas, Masran Island, Gebel En, Renk, 

 south of Melut, Bahr el-Zarafa (southern end), and Hillet al-Nuwer. 



An example from Kosti, having the apex broken and four whorls intact, 

 measures alt. 66, diam. 56'5; aperture, alt. 48, diam. 30 mm. 



A specimen from the Bahr el-Zarafa has a higher spire than usual and 

 thus resembles a variety called elongata hj Rochebrune and Germain (Mem. 

 Soc. Zool. France, 1904, vol. xvii. p. 5). They state that their shell corre- 

 sponds with that figured by Bourguignat in Moll. Nouv., Litig. &c., 1863, 

 p. 78, pi. 11. fig. 13. The dimensions they give are alt. 70-78, diam. 65-69; 

 aperture, alt. 50-55, diam. 35-38 mm. Locality, River Omo, at a height of 



