96 MOLLUSOA. 



Order II.— PULMONOBRANCHIATA. 



Family— LIMNiEID^. 



PLANOEBIS. 



albus. Mull. 

 glaber. Jef. 

 spirorbis. Mull. 

 vortex, Linn. 

 carinatus. Mull. 

 complanatus. Linn. 



var. albida. 

 corneus. Linn. 

 contortus. Linn. 



PHYSA. 



hypnorum. Linn. 

 fortinalis. Linn. 



LIMN^A. 



peregra. Mull. 



var. intermedia. Fer. 

 auricularia. Linn. 

 stagnalis. Linn. 



var. fragilis. Linn. 

 palustris. Mull. 



var. elongata. 



var. tin eta. Jejf. 



var. albida. 

 truncatula. Mull. 



Pond at Spurs Bottoms, etc. 



Pits at Willington. 



Old Trent, etc. 



Very common. 



Common. 



Common. 



Kepton Mill Top-dam. 



Old Trent — common. 



Old Trent, etc. 



In ditches. 



River Trent — common. 



Common. 



Eepton Park Pond. 



Repton Park Pond. 



Old Trent — common. 



Willington Pits. 



Old Trent. 



Old Trent. 



Old Trent. 



Old Trent. 



Marshes close to Old Trent. 



