MOLLUSCA. 95 



CLASS II.— GASTEROPODA 

 OR UNIVALVES. 



Order I.— PECTINIBRANCHIATA. 



Family I— NEEITID^. 

 NEEITINA. 



fluviatilis. Linn. Willington Canal. 



Family II.— PALUDINIDiE. 

 PALUDINA. 



vivipara. Linn, WiUington Canal. 



BYTHINIA. 



tentaculata. Linn. Eepton Top Mill-dam, and 



Trent, 

 var. ventricosa. Monhe. Eepton Top Mill-dam. 

 var. albida. Eepton Top Mill-dam. 



Leachii. Shepp. WilUngton Pits, etc. 



Family III.— VALVATID^. 

 VALVATA. 



piscinalis. Mull Trent, near Newton Solney. 



cristata. Mull, Egginton, in Ditches. 



