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TROCHID/E. 



Eumargarita helcina (Fab.) ; Redcar,Saltburn, Staithes. 



Gibbula cineraria (Linn) ; Redcar, Saltburn, Skinnin- 

 grove, Staithes, Runswick Bay, Whitby, Robin Hood's Bay, 

 Bridlington ; common. 



*Gibbula cineraria var. electissima (Bean) ; Saltburn. 



*Eumargarita graenlandica (Chemnitz) ; Skinningrove. 



Calliostoma zizyphinus (Linn) ; Redcar, Saltburn, Staithes. 



LITTORINIDJE. 



*Lacuna crassior (Montague) ; Saltburn. 



Lacuna divaricata (Fab.) ; Redcar, Saltburn, Skin- 

 ningrove, Runswick. 



*Lacuna parva (Da Costa) ; Saltburn. 



Lacund pallidula (Da Costa) ; Redcar, Saltburn. 



Littorina obtusata (Linn) ; Redcar, Saltburn, Skinnin- 

 grove, Staithes, Runswick Bay, Whitby, Robin Hood's Bay, 

 Bridlington ; common. 



*Littorina obtusata var. aestuarii (Jeffreys) ; Redcar, Salt- 

 burn, Skinningrove. 



Littorina rudis (Maton) ; Redcar, Saltburn, Skinningrove, 

 Staithes, Runswick, Whitby, Robin Hood's Bay, Brid- 

 lington ; common. 



Littorina rudis var. saxatilis (Johnson) ; Saltburn. 



Littorina littorea (Linne) ; Redcar, Saltburn, Skinnin- 

 grove, Staithes, Runswick Bay, Whitby, Robin Hood's Bay, 

 Bridlington. 



rissoid;e. 



Rissoia parva (Da Costa) ; Redcar, Saltburn, Runswick ; 



