2$o THE SCOTTISH NATURALIST 



riverside on Inverugie to all appearances an excellent 

 habitat proved to be the most barren locality visited. 



Old ruins in Aberdeenshire were not so plentiful. In 

 some cases there were no loose stones lying about either on 

 the walls or on the ground, and in these cases very few 

 species were observed. This applies to the old Castle of 

 Slains, though the walls of decaying cottages once occupied 

 by fishermen yielded Balea perversa the only habitat noted 

 for it on the east coast and also Pupa cylindracea, commonly. 



Regarding the occurrence of species many which occurred 

 commonly on the west coast were scarce on the east, and similarly, 

 species common on the east were equally scarce on the west. 

 Probably this may be accounted for by the difference in the physical 

 features of the different coasts. 



Limax arborum was equally distributed on both coasts, and 

 could be found crawling up the face of the cliffs, where at high tides 

 it must catch the spray from the waves that break against the base 

 of the cliffs. 



L. maximus was very rare though many apparently suitable 

 habitats occurred, and this remark also applies to L. cinereotiiger. 



Agriolimax agrestis was the most abundant slug, especially on the 

 east coast, and it was noted in every locality visited. It was least 

 common on Skye. On the Aberdeenshire side it was in some 

 localities an undoubted pest. Whilst walking from the old Castle 

 of Slains to Pitlurg Station during a very wet day, the roads were 

 so covered by the crawling multitudes of this species that one could 

 not put foot down without treading on several every time. These 

 roads were through an agricultural district, and the slugs had 

 apparently crawled out of the wet fields. Agriolimax Icevis was 

 not common, which may be accounted for by there being so few 

 mature specimens. I noted it in an immature stage in every 

 locality. The time to collect mature specimens of the Marsh Slug 

 is early spring, or in very late autumn, as my own personal experi- 

 ence of it in Yorkshire shows. 



The possible occurrence of Limax tenellus was not lost sight of, 

 and a good deal of time was spent in searching for it in the few 

 pine and other old woods that I could visit ; but in only one instance 

 could I say that I thought I had found it and in that I have no 

 corroboration, from inability to send the example to a limacologist ; 

 this was in the small pine wood at Glenelg. 



The remarks made on Agriolimax Levis practically apply 



