360 PROCEEDINGS OF THI': M ALACOLOGICAL SOCIETY. 



Bahr el Djebel (March 8, 1910), and two at Gemesa, Balir el Djebel 

 (March 9, 1910). 



Physopsis Afeicana, Kraiiss. 



Phi/sopsis Africana ranges from South Africa througli Mozambique 

 and Zanzil)ar to the Nile. Dr. le Roi obtained one specimen in the 

 Bahr el Ghazal (February 25, 1910). 



Physopsis Didieri, Bochebr. & Germ. 



This rare species was described by Rochebrune & Germain 

 (Bull. Mus. hist, nat., 1904, p. 142). It was collected by the 

 members of the mission of Bourg de Bozas at Donfile, White Nile. 

 Dr. le Roi obtained a fine living specimen in the Mahr el Ghazal 

 (February 25, 1910). Tt is quite distinct from the preceding species, 

 although found together. 



Planorbis Sudanicus, v. Mart. 



In Dr. le Roi's material there are eight specimens, which represent 

 different ages. Tiiey agree well with von Martens' description 

 (Malak. Blatt., 1870, p. 35). The first figure of the shell is to be 

 found in Pfeiffer's Novitates Co^ichologicce, vol. iv, pp. 23-4, pi. cxiv, 

 figs. 6-9. Dr. le Roi's specimens are from the Bahr el Ghazal 

 (February 28, 1910). 



Segmentina angusta, Jick. 



One specimen of this rare Segmentina was collected by le Roi 

 in the Bahr el Ghazal (February 28, 1910). It agrees well with 

 Jickeli's description and figure (Jickeli, Faiuia der Land- und 

 Silssivasser - Molliisken Nord-Ost-Afr ilea's, Dresden, 1874, p. 220, 

 pi. vii, fig. 24). 



Cleopatra bulimoides (Oliv). 



Dr. le Roi collected one specimen of this common species at Dakke, 

 Nubia (February 7, 1910). 



Pachylabra ovata (Oliv), var, Kordofana, Parr. 



Three specimens of this variety of the widely distributed Pachylahra 

 ovata, which is common in Kordofan, were taken by le Roi in the 

 Bahr el Abiad. 



Pachylabra Wernei (Phil.). 



Five magnificent specimens were collected by le Roi in the Bahr el 

 Abiad together with the preceding species. 



Lanistes Boltenianus (Chemn.). 



Six specimens of this Lanistes, which is common in the Nile Valley, 

 were obtained by le Roi, one in the Bahr el Ghazal (February 24, 1910), 

 one in the Bahr el Djebel at Kiro (March 17, 1910), one in the 

 Bahr el Abiad at Abu Doleb (March 30, 1910), and three in the 

 Bahr el Zeraf (March 24-8, 1910). 



