STANDEN AND HARDY: MOLLUSCA OF OBAN AND LISMORE. 273 



noticed crawling on the elm trees, to a great height above 

 the ground. On Lismore it is extremely abundant, and very- 

 fine, and may almost be stroked off the wet rocks by the 

 handful ! Most of the shells are covered with a dense con- 

 fervoid growth, which makes them seem unusually large, 

 and gives them a weathered appearance, but this easily 

 washes off and shows a beautifully marked and fresh dark 

 epidermis underneath. 



Cochlicopa lubrica Miill. — Sparingly distributed throughout 

 the Oban district. Very common on I^ismore. Both 

 type and varieties ovata, hyali/ia, and lubricoides occurred 

 in equal numbers in each locality. 



Succinea putris L. — A small tumid form was found in great 

 abundance in one locality on Lismore, swarming over the 

 watercress growing on a boggy piece of ground near the 

 shore. 



Carychium minimum Miill.— Common at Ardbhan Craigs; 

 very scarce elsewhere throughout the Oban district, and on 

 Lismore. 



Planorbis nautileus L, — A few amongst duckweed in a 

 small pool on Lismore. 



P. albus L. — In Lochan Dubh, sparingly, but nice and clean. 



P. spirorbis Miill. — A few small specimens \n a pool on 

 Lismore. 



P. contortus L. — A few in a drain on Lismore. 



Physa fontinalis L. — Some small specimens in Lochan Dubh. 

 Scarce. 



Limnaea peregra Miill. — A few dwarfed specimens in Lochan 

 Dubh ; and in a brook near the ferry at Ardbhan Craigs we 

 found a small distorted variety in considerable numbers, 

 many of them showed " erosion bands," and others were 

 subscalariform. On Lismore a small form was found in all 

 the lochs, ponds, and streams examined, but not plentifully. 



