110 Beport of tlie Billiarzia Mission in Egypt ^ 1915 



the bed of the canal, enormous numbers of dead and disintegrating 

 shells can always be seen. 



Pallary gives no locality but says that this species is very 

 common in all the waters of Egypt. 



CyCLADIDiE. 



Cijclas {Sphcerium) teilhardi, Pallary, 1909. 

 A few examples were collected from the ponds in the Zoological 

 Gardens at Giza. 



^^ 



Fig. 83. — Cy das {Si^hcerium) teilhardi. (x li.) 



Pallary bases the species on material collected at Gabbari near 

 Alexandria. 



MUTELID^. 



Spatha ruhens, Lamarck, 1819. 

 A few examples of this enormous bivalve were dredged in the 

 Zoological Gardens. 



It is stated by Pallary to occur in the waters of the Nile and 

 in the canals of the Delta. 



Unionid^. 

 Noclidaria nilotica, Cailliaud, 1823. 

 Frequent in mud from ponds in the Zoological Gardens and 

 from the Ismailia Canal. 



f 



Fig. 8i. —2'ioditlaria iiilulica. (x 1.) 



Pallary states that this species is rarely found in typical form, 

 but it occurs throughout the course of the Nile. 



