268 



Planorbis Guadaloupensis. 



is Planorbis complanatus.Linn. 

 is Planorbis corneus, Drap. 



Planorbis imbricatus, Mull. 



Planorbis ferrugineus, Spix. 



Planorbis elevatus, Adams. 

 Planorbis concavus, Anth. 



is Planorbis trivolvis, Say. 



is Planorbis complanatus, Linn. 



fossil. 



Planorbis regularis, Lea. 



Planorbis fallax, Say. 



is Planorbis deflectus, Say. 



is Lymnaea columella, Say. 

 is Lymnaea desidiosa, Say. 



is Lymnaea stagnalis, Drap. 



Lymnaea umbilicata, Adams. 

 Lymnaea emarginata, Say. 

 Lymnaea Virgineana, Lam. 



