MOLLUSCA. 



This list was compiled by F. Podmore in 1875. All those marked * were 

 verified in 1888 by A. G. Stubbs. In 1889 one species was added. There are 

 specimens of those marked f in the Museum, 



(Named from Jeffreys's " British Conchology.") 



CONXHIFERA. 



t*Sphaerium corneum 



* , , rivicola 



* , , lacustre 

 *Pisidium amnicum 



* ,, nitidum 

 t*Unio pictorum 

 t*Anodonta cygnea 



* , , anatina 



River Lea. 

 River Lea, 

 Am well. 

 Amwell, 

 Amwell, 

 River Lea, 

 River Lea. 

 River Lea. 



Gasteropoda — Pectinibranchiata. 



t*Neritina fluviatilis 

 t*Paludina vivipara 

 t*Bythinia tentaculata 

 t ,, leachii 

 t*Valvata piscinalis 

 , , cristata 



The Lea. 



River Lea. 



River Lea. 



Amwell. 



Amwell. 



St. Margarets. 



Gasteropoda— PuLMONOBRANCHi ATA. 



f Planorbis nautileus 



fragilis 



Near Hertford. 



St. Margarets. 



St. Margarets. 



Amwell. 



Amwell, 



Amwell. 



Amwell. 



Amwell. 



Amwell, 



St. Margarets. 



St. Margarets. 



Passim. 



Amwell. 



Passim. 



Pond by Hailey Lane. 



Passim. 



The Lea. 



