Egyptian Mollusca 



97 



Class GASTROPODA. 

 Tectibrauchia ] (marine 



„ . ,, , , . f Tectibrauchia I (marine 

 Opisthobranchia ] Nudibranchia \ forms) 



Stylommatophora 



Pulmonata ^ 



^ Basommatophora 



Aspidobrancbia 



'Pectiuibranchia 



Docoglossa 

 Rhipidoglossa 



Tffinioglossa — Platypoda- 



' Toxielossa 



Pupidrt^ 

 Saccitieidfc 



Planorbidaa 



PliysidtT 

 J Limnteidte 

 \ Aucylidse 



I HELIX. 

 I EREMINA. 

 I LEUCOCHILOIDES. 

 I CALAXIS. 

 — SUCCINEA. 

 PLANORBIS. 

 BULLINUS. 

 PYRGOPHYSA. 

 -PHYSA. 

 -LIMN AC A. 

 -ANCYLUS. 



Neritidse 

 Paludinidae 



Ampullaridae 

 Valvatidse 

 H3'drobiidte 

 Melaniid?e 



Stenoglossa 



i^Rhacbiglossa 

 Class LAMELLIBRANCHIA. 



/ Cyreuidte 



Cycladidifi 



Eulamellibranchia— Submy tilacea— ^ 



Unionidffi 



V Mutelidse 



— neritina. 

 ( vivipara. 

 "( cleopatra. 



f AMPULLARIA. 

 I LANISTES. 

 — VALVATA. 

 J BYTHINIA. 

 I HYDROBIA. 

 — MELANIA. 



■CORBICULA. 

 CYCLAS (SPH.ERIUM) 

 PISIDIUM. 

 EDPERA. 

 NODULARIA. 

 LAMELLIDENS. 

 MUTELA. 

 SPATHA. 



GASTROPODA. 



Helicid^. 



Helix {Hygromanes) ohstructa, Ferussac, 1821. 



Common among the overhanging grass along the edges of the 

 ponds in the Zoological Gardens at Giza. 



^ 



Fig. 56.— Hijgroiuanes ubstriicta. (x 2.) 



Stated by Pailary to be common throughout the Delta, but not 

 found by us elsewhere than above. 

 7 



