Egyptian lifolhisca 105 



In marshy pools on the desert side of the Ismailia Canal near 

 Bilheis a peculiar variety [Fig- '72] of Liinncca, diffeiing apparently 

 from those recorded for Egypt, was found in numbers. 



(?) LimncBa tnmcatula, Miiller. 



Found in large numbers in small irrigation channels on the 

 Island of Gezireh, in the ponds in the Zoological Gardens, Giza, 

 and in irrigation channels in agricultural land south of Bilhois. 

 This form, curiously enough, is entirely absent from Marg. 



The specimens differ slightly, but apparently constantly, from 

 typical examples of this species received from England, and there 

 is some probability that the Egyptian material should be placed 



Fig. Id.— Lbnna-a tnmcatula, mq. (x 1^.) 



under a separate category. Pallary states, however, that L. triin- 

 catiila and a variety minuta is found throughout the course of the 

 Nile. 



The occurrence of this form in large numbers in Egypt is 

 apparently overlooked by Looss in his discussion on the carrit^r of 

 the liver-fluke of sheep and cattle in Egypt. 



Ancylid^. 

 Ancylus clessini, Jickeh, 1882. 



A few specimens of this small limpet were occasionally found on 

 dead leaves dredged from the bottom of the ponds in the Zoological 

 Gardens, Giza. The species has been recorded once previously, 

 and was collected by Lhotellerie at Alexandria. 



PaLUDINID/E. 



Vivipara unicolor, Olivier, 1801. 



Of constant occurrence in all our collections. Very common in 

 the ponds at the Zoological Gardens and at Marg. 



Stated by Pallary to occur throughout the course of the Nile 

 and its tributaries. 



