MOLLUSCA IN THE NORTH OF SCOTLAND j 5 i 



to Vitrina pelludda also, which is not adult until laic autumn. 

 Immature specimens turned up in every locality visited. The only 

 mature ones seen were dead, the living specimens being only half 

 grown. 



Hyalinia crystallina, H. alliaria, II cellaria, H. nitidula, and 

 H. pura occurred in every place visited, and with the exception 

 of H. cellaria were in no single instance common. H. cellaria 

 was common on several occasions amongst old ruins, both on Skye 

 and on Glenelg. H. radiatula occurred in most places in every 

 district, sparingly along with H. fulva. Zonitoides excavatus I only 

 noted once, occurring under fallen timber in the wood on the road 

 to Kerrydale, Gairloch. Near Portree I obtained about three 

 specimens of a Hyalinia, which seemed to me to be helvetica, but 

 I have no corroboration as to the correctness or otherwise of this 

 opinion. 



Avion ater was abundant at Gairloch, more so than at any other 

 locality visited, and here the only variation observed was the black- 

 footed one (var. aterrima). The species was sparingly distributed 

 in the Portree district of Skye, but occurred more commonly near 

 Broadford. In Aberdeenshire it was most common on the slopes 

 of the cliffs, and on the sloping banks of the river Don between the 

 two bridges. At this place were the only coloured forms I saw 

 var. castanea, but very dark colour. Art on intermedins occurred in 

 every district in damp situations along with A. hortensis and A. 

 circumscriptus. A. subfuscus was only seen in one or two localities, 

 at Gairloch, and on the banks of the Don, near Aberdeen. 



Punctnm pygmceum is another species which my past experience 

 has shown to be most common in early spring. I noted it, however, 

 in most localities on the west coast and also in the Don Valley at 

 Persley, and on the links at Belhelvie. 



Sphyradium edentulum may be said to be the most ubiquitous 

 land shell observed during the investigation, occurring throughout 

 every district visited. In practically every instance this species has 

 turned up on investigating the Hairy Woodrush, both on the west 

 and the east coasts. 



Pyramidula rupestris was not seen. Any walls or rocks in the 

 carboniferous district round Broadford, Skye, were most diligently 

 investigated in the hope of finding this shell, and other likely 

 habitats in other districts were searched, especially old ruins, but 

 without success. 



Pyramidula rotundata, probably the most abundant shell in 



