The Scottish Naturalist. 



207 



2. Papillifera, Breb. 



Little Don. 



3. Rotata (Grev.) Ralfs. 



Ditch at Meikle Moss, Alford. 



4. Thomasiana, Archer. 



Tonley Moss. 



5. Truncata, Corda. 



Tonley Moss. 



penium, Breb. 



1. Cylindrus, Ehr. 



Correnie ; Towie ; Tonley. 



2. Didymocarpim, Lundell. 



Correnie ; Tough ; Towie ; Whiteley Marsh. 



3. Digitus, Ehr. 



Correnie ; Tough. 



4. Margaritaceum, Ehr. 



Pond at Haughton. 

 var. v. Ralfs. 



Tillyfour ; Ditch at Meikle Moss, Alford. 



5. Navicular Breb. 



Correnie ; Little Don ; Towie ; Waterside, Haughton. 



6. Truncatum, Ralfs. 



Curling Poud, Haughton. 



sph^erozosma, Corda. 



1. Excavatiwi, Ralfs. 



Whiteley Marsh ; Pond and Waterside at Haughton ; 

 Tonley. 



2. Granuliferum, Roy and Bisset. 



Little Don. 



3. Vertebratum (Breb.) Ralfs. 



Little Don. 



SPiROTiENiA, Breb. 



1. Condensata, Breb. 



Ditch at Meikle Moss, Alford ; Tonley. 



2. Minuta, Thur. 



Whiteley Marsh. 



3. Obscura, Ralfs. 



Ditch, Meikle Moss, Alford. 



4. Parvula, Archer. 



Tillyfour; Tonley. 



