82 



Proceedings of the Royal Irish Acaik7mj. 



the -western islands, it is usual to tind 

 only jet-black specimens. The vars. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KG KD DU 

 CL NT QC CW Wl 

 NK LK ST KK WX 

 SK MC EC WA 

 WC 



castanea and plutnbea, which aie more 

 prevalent in the eastern parts of the 

 country, are nevertheless generally 

 distributed on the mainland, and have 

 also been noted as occurriag on several 

 of the islands. The vars. succinea and 

 albolateralis have been found in many 

 districts, but show no particular geogra- 

 phical distribution. The altitndinal 

 distribution of Arion ater extends from 

 sea-level to over 3000 feet, at which 

 high altitudes the var. aterrima only 

 has been noticed. 



Arion subfuscus (Draparnaud). 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WG NG LF WH ME 

 SG KC KD DU 

 CL NT QC CW Wl 

 NK LK ST KK WX 

 SK MC EC WA 

 WC 



Common throughout the entire main- 



land and usually met with on the 

 islands. Like Arion ater, this slug is 

 found from sea-level to the summits of 

 the highest mountains. In the western 

 and south-western districts specimens 

 are frequently more distinctly banded. 

 Its colouring is fairly constant in other 

 parts of the country. 



Arion intermedius Normand. 



WD ED LD AN 

 FE TY AR DO 

 WMSL LE MO 



EM RO CV LH 

 WGNG LF WHME 

 SG KC KD DU 

 CL NT QC CW Wl 

 NK LK ST KK WX 

 SK MC EC WA 

 WC 



Very generally distributed, hut more 

 local than any of the other species, 

 especially in the central, and in parts of 

 the eastern counties. In the west and 

 on the western islands it is often the 

 most abundant of all the Arionidae, 

 usually living in great profusion at the 

 roots of plants on the damper parts of 

 the cliffs and in similar situations. 

 Western specimens are generally more 

 distinctly banded than those found in 

 the east, and are often of an almost 

 uniform grey colour above, sometimes 

 nearly black, the head and tentacles 

 being generally darker than the rest of 

 the animal. The yellowish and less 

 viscid mucus will usually distinguish 

 these western specimens from Arion 

 horUtisis, even if the serrated dorsal 

 line is not visible. 



