102 Beport of the Bilharzia Mission in Egyiyf, 1915 



BuUimis contortus, Michand, 1829. 

 Common in the ponds of the Zoological Gardens, Giza, at Marg, 

 and on the Sweet Water Canal, usually associated with B. dyhoivsld. 



1^ ^^ 



Fig. 66. — BuUinus contortits. (x 2) 



Mrs. Longstaff has found it at Lake Shambe and at Masran 

 Island on the White Nile. It has a very wide range, being reported 

 from North, West and South Africa, Abyssinia, the Euphrates, and 

 South Europe. 



B. contortus is one oj the intermediate hosts of Bilharzia 

 licematohium {sens, strictu) in man in Egijpf. 



BuUinus dyhoioski, Fischer, 1891. 

 Very common in the ponds at the Zoological Gardens, at Marg, 

 on the Sweet-water Canal and generally in the canals and birkets. 



Fig. 67. — BuUinus (lyhowfski. (x 2.) 



Teilhard records it from Matarieh, and Pallary notes its occur- 

 rence in the collections of Lhotellerie from around Alexandria. 

 This foim is said by Pallary to be that provisionally named by 

 Dr. Innes Physa alexandrina and appears in the lists of Sonsino 

 and Looss under this synonym. 



B. dyhoioski and B. alexandrina are intermediate hosts of 

 Bilharzia h aimatohixcm {sens, strictu) in man in Egypt. The 

 cercaria is shown in fig. 47. 



BuUinus innesi, Bonrguignat. 

 A number of specimens found associated with the two pre- 



