igS JOURNAL OF CONCHOLOGY. 



MOLLUSCA OF MERIONETHSHIRE. 



By F. G. FENN. 



(Read before the Conchological Society). 



The following is a list of land shells collected during a short 

 stay at Bont-ddu near Dolgelly. Owing to the short time which 

 I was able to devote to collecting, it is very far from complete, 

 the more so, as I devoted the greater part of the time to the 

 slugs, merely collecting the others as I came across them. 



Where not otherwise given, the locality is in all cases 

 Bont-ddu. 



Arion ater (L). This is far the commonest slug in the district. 

 It exists in profusion in the valleys, and occurs more spar- 

 ingly on the hills. The greatest elevation where I found it 

 was about 2000 feet above the sea, on the slopes of Cader 

 Idris. The type is subject to a little variation, the common- 

 est form being completely black, the next having the sole 

 grey, and the last the back black and sides with a slight 

 brown tinge. 

 A. ater var. albolateralis Roebuck. I found this of frequent 

 occurrence with the type, but never at any great elevation. 

 A small variety intermediate between this and bicolor is 

 common on the lower slopes of Cader Idris. 

 A. ater var. bicolor (Moq.). One or two specimens from 

 Cader Idris evidently belong to this variety, though they 

 merge by insensible gradations into var. albolateralis. 

 A. subfuscus (Drap.). Common in low-lying ground. 

 Li max cinereo-niger var. nigra Moq. One or two speci- 

 mens beneath stones in an oak copse. 



L. cinereo-niger var. ? Animal grey, with two dark 



bands on each side ; foot white. One specimen only, 

 beneath stones with var. nigra. 



J.C, v., July, 1887. 



