MOLLUSCA FROM THE SOUTHERN SUDAN. 263 



• Genus Sph.erium, Scopoli. 



Sph.erium teilhardi, Pallary. 



Sphcsrium teilhardi, Pallary, 1909, Mem. Inst. Egypt, vol. vi. fasc. i. p. 74, pi. 4. 

 fig. 27. 



About thirty-four specimens were taken. The species was determined by 

 M. Pallary, who had recorded it from Lower Egypt, but this seems to be the 

 first notice of its occurrence in the Sudan. It was found both to the north 

 and south of Lake No, at Abba Island, Hillet Abbas, Grebel En, Lake 

 Shambe, and possibly one immature shell from Gondokoro is referable to 

 this species. The largest is from near Gebel En; it measures, long. 11*5, 

 alt. 8'5, crass. 5*5 mm. 



? PiSIDIUM sp. 



Only two small specimens possibly referable to this genus were found, one 

 at Gebel En and the other at Lake Shambe. They are, however, too immature 

 for certain identification. 



Genus EuPERA, Bourgidgnat. 



EUPERA PARASITICA, Desll. 



Pisum parasitAcum, Parreyss in Deshayes, 1853, ' Catal. Concli. Bivalv. Brit. Mus.' vol. i. 



p. 280. 

 Limosina ferruginea, Jickeli, 1874, ' Frama N.O.-Afrikas,' p. 293, pi. 11. fig. 16. 



Five specimens were taken, four at Gebel En and one at Hillet al-Nuwer. 

 M. Pallary kindly examined this and the two following species. He states 

 that it occurs throughout the whole course of the Nile ; Bourguio-nat records 

 it from Abyssinia and von Martens from the Victoria Nyanza. 



EuPERA JICKELI, Bourg. 



Euper a jickeli, Bourguignat, 1883, ' Hist. Malac. Abyssinie,' p. 134. 

 Liiiwsina ferruginea, Jickeli, 1874, op. cit. p. 293, pi. xi. fig. 17. 



Nine examples in Lake Shambe, and thirteen from Masran Island. Only 

 one specimen was found by Dr. Innes Bey in the White Nile, and the exact 

 locality is not stated. Bourguignat records it from Abyssinia and throughout 

 the course of the Nile to Lower Egypt. 



EuPERA LETOURNEUXI, Bourg. 



Eupera letourneuxi, Bourguignat, 1883, ' Hist. Malac. Abyssinie,' p. 134. 



Seven specimens were found near Gebel Ahmad Agha in the interstices 

 of clusters of ^S^theria elliptica, Lam. Bourguignat only reports its occur- 

 rence in the canals of Alexandria. This appears to be a new record for the 

 White Nile. 



