Lebour: Mollusca in Northumberland. 67 



6 to 7 mm. in length! Species very local. The shells live 

 in very narrow holes in the wall, from which they only 

 emerge after rain. 

 Clausilia hidentata (Strom). Common, among stones, Cor- 

 bridge. 



Clausilia laminata (Montagu). Very common, at roots of 



trees in woods, Corbridge. 

 Cochlicopa lubrica (Mi'iller). Very common, in moss and roots, 



Corbridge. 



Succinea putris (L.). Very common, in grass near a small 

 spring close to the beach, Bervvick-on-Tweed. Very fine 

 specimens. 



Carychium minimum (Mi'iller). Not common, in moss on 

 old stone wall, Corbridge. 



Limnaea peregra (Mi'iller). Very common everywhere. 



Limnaea palustris (Miiller). Not common, very local. Several 

 specimens in small stream across a lane, Corbridge; stream 

 since been blocked. Species no longer to be found there. 



Limnasa truncatula (Mi'iller). Common, muddy ditches, Cor- 

 bridge, dirty black bogs in wood near Hexham, with 

 innumerable tadpoles for companions, but no other shells. 

 Very common in mud between high and low water marks 

 of tidal parts of river Tweed. 



Physa fontinalis (L.). Very common on leaves floating in 

 water, river Tweed, Chain Bridge. 



Planorbis parvus (Say). Not common, ponds in Whittle 

 Dene, Ovingham. 



Ancylus fluviatilis (Mi'iller). Very common nearly everywhere 

 in rivers and running streams. 



Valvata piscinalis (Mi'iller). Very common, Chain Bridge, hi: 

 river Tweed. 



Pisidium amnicum (Mi'iller). Common, river Tyne, Corbridge, 

 and river Tweed, Chain Bridge. 



Pisidium fontinale (Drap.). Very common, bogs, ditches, and 

 streams nearly everywhere. 



Pisidium nitidum (Jenyns). Not common, river Tyne, Cor- 

 bridge, and river Tweed, Chain Bridge. 



Sphaerium corneum (L.). Very common, river Tweed, Chain 

 Bridge. 



Anodonta cygnea (L.). Common, river Tweed, Chain Bridge, 

 Anodonta anatina (L.). Very common, river Tweed, Chain 

 Bridge. 



1900 March 2. 



