SYNOPSIS GENERUM. 



Family 3. Cyclostomacea. 



Pupina. Cyclostoma. 



Truncatella. Helicina. 



Family 4. Auriculacea. 



Auricula. Chilina. 



Scarabus. 



Family 5. Lymneeana. 

 Planorbis. Ancylus. 



Lymntea. 



Order VII. Pectinibranchiata. 



Family 1. Melaniana. 

 Melania. Melanopsis. 



Family 2. Peristomata. 



Valvata. Ampullaria. 



Paludina. 



Family 3. Neritacea. 



Navicella. Neritopsis. 



Neritina. Natica. 



Nerita. 



Family 4. Ianthinea. 

 lanthina. 



Family 5. Plicacea. 

 Tornatella. Pyramidella. 



Family 6. Turbinacea. 



Rissoa. Delphinula. 



Eulima. Solarium. 



Scalaria. Phorus. 



VOL. I. 



