I- KU)) IIJOK OKI. AM). M.-X. Kl. 



sorte; men Kropssidcrne ere hvide, o^ SkjoMe-t paa Sidcrnc- og i det 

 forreste Parti niej^et lyst skiddent Uniiit; l'"arvegrændsen temmelig skarp. 

 Hoved og de 4 I'Dl« hoin graasorte. I'odljræninien rodgulagtig med morke 

 Tværstreger. Udvoxet Exemplar. (PI. 1, l'ig. 11)". 



Later on the variety has been found in Sagvaag, Stord, and thus 

 seems to have a westciii range. It is "a vestlandsform", in accordance with 

 its distribulicjn in the liritish Isles. 



Var. ni argin el la Schr.anck, Fauna Boica, 1803, p. 252, No. 3158. 



Umax maririnellus Sciiranck, op. cit. 



Arion rnfits iiKiri^hidliis Moquin-Tandon, Hist. .Moll., \>. ii, \)\. I, fig. 24. 



Black with red or yellow foot-fringe. 



During the past fifty years it has not i:icen noticed in Norway, but 

 Jo.'XCHiM FuiELE'saw it near Bergen and in Hardanger, and O. S. Je.nse.x 

 f)und it in a forest of beech-trees near Lar\-ik. 



Distribution. In determining the limits of range of Arion ater, there 

 are two essential difficulties to be confronted. First there are erroneous 

 determinations, which, according to Simroth (190 i I, are responsible for the 

 statements from Russia'. Secondly it is difficult to limit the species against 

 southern forms, which when included in Anon atcr, enlarge its range 

 towards the south. As will be seen from the list of synonyms, these doubt- 

 ful forms are not considered here. 



The species is thus distributed over Western Europe, from Ribbenesø 

 in Finmark in the north to the River Tajo in the Pyrenean Peninsula in 

 the south (Ribbenesø, 70" N. L., is the most northern locality for the 

 species, according to a specimen in the Tromsö Museum, found by j. 

 Sparre Schneider and not published previously). Towards the east its 

 occurrence in Russia is doubtful, as stated above. Throughout large parts 

 of Norway it is very common. It occurs in Sweden as far as West- 

 manland and Upland, and further all over Denmark, Germany, the 

 Netherlands, France and Switzerland; in Italy, where it is said 

 to have been introduced by man, it is most common in the north. Fin- 

 land has no certain localities, but it is found in Silesia and the former 

 Bosnia. Outside the continent of Europe it is excessively common in the 

 British Isles, and occurs in the Faeroes and in Iceland-. 



With regard to Norway, Erik Pontoppidan, the bishop, was probably 

 the first to mention the species (1753). In his great work. Det forste 

 Forsøg paa Norges naturlige Historie, he speaks of large black 

 slugs, and there is every probability that this is not Liiiiax cinerco-nigcr^ 

 according to which this is the first account of a Norwegian Arioji. 



' To judge from his list of authorities, however, Simroth was not acquainted with the 

 statement of Malm (1876), that he had found Arion ater in the neighbourhood of 

 Boris Gleb, near the Norwegian border. I am liable to think this statement correct. 



2 It was introduced into New-Zealand by man. 



I 



