-♦> f"auna : InvertelDrateS 



OPISTHOBRANCHIATA (Marine Gasteropods) 

 Siphonaria grisea\ 



S. venosa VLimpet-like in shell. 



Gadinia afra ) 



PULMONATA (Snails, Slugs, etc.) 

 Ennea liberiana. 

 Streptaxis monroviana. 

 Stenogyra involuta. 

 S. striata. 

 Achatina variegata. 

 A. purpurea. 

 A. knorri. 



Veronicella pleuroprocta. 

 Limicolaria turbinata. 

 Perideris torrida. 

 P. interstincta. 



Sub-Class: PELECYPODA 



FILIBRANCHIATA (Mussels, etc.) 

 \Mytilus senegalensis. 

 . M. var. semistriata. 

 M. perna. 



PSEUDOLAMELLIBRANCHIATA (Oysters) 

 Ostrea sp. 



EULAMELLIBRANCHIATA (Unio Shells, etc.) 

 f ./Etiieria plumbea (Fresh-water Oysters) 

 . Dreissensia africana. 

 Cyrenoida dupontia. 

 •^Meretrix tripla. 



CRUSTACEA 



MALACOSTRACA (Crabs, Crayfish, etc.) 



BRACHYURA (Crabs) 



\ Cardisonia arniatum (big land Crab). 

 i Sesarnia africana\ 



\S. anguknsis \ Small land Crabs. 

 \S. buettikoferi ] 



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