50 H<II)I IIJf)K ØKI.ANIJ. M.-N. Kl. 



Distribution. As malacologists for a long time were not awarc 

 of this species, the knowledge of its distribution is very deficient. In 

 the north it has been found at about 64 N. L. in !•' i n 1 a n d , anrl in the 

 south th< re are scattered lr)calities in the l-'yrenean l-'eninsula and in 

 Italy. It is common in the British Isles, in France especially in the 

 western and northern parts iGei'main 1913), and is recorded in Germany, 

 Switzerland, lîohcmia (according to Babor and Novak, 1909) and the 

 middle of F i n 1 a n d . In -S w e d c n it is unknown, but in Denmark it occurs 

 in several localities in Jutland and Seeland (Steenberg 1913). It is also 

 recorded in the Faroes and the Azores, and even in South Africa 

 and N e w -Z e a 1 a n d . 



The species has not previously been observed in Norway, but I 

 have now registered its occurrence on the west coast of the country, 

 between Kristiansund and Farsund, just in those parts where slugs and 

 snails have been searched for to a far less degree than for instance in the 

 southern and the greater parts of the eastern regions of the country (map 5). 

 Therefore, the conclusion must be that it is in fact restricted to the west 

 coast; it belongs to those "Atlantic" species of plants and animals which 

 are to be found in this mild and damp climate. 



Bionomics. On the outskirts of woods and in the open country Arioii 

 intermedins is to be found under decaying leaves, in moss or under wood, 

 often forming a peculiar little spiked hemisphere. According to T.-\vlor it 

 is omnivorous, but chiefly feeds on vegetables, and especially on fungi. 



The congress has not been observed ; with regard to reproduction 

 and development the careful examinations of Kunkel may be quoted 

 also in reference to this species. At an age of 7 — 9^'2 months the animal 

 is mature ; the laying begins in July or August and goes on for about two 

 months, the number of hatches during this period being 6 — 10, with 

 12 — 30 eggs in each, and the total number of eggs varying between 

 106 — 165. These are laid in moss or in the earth, and are proportionally 

 large, either globular with a diameter of 2 mill, or oval with the same 

 length and a breadth of 1,5 mill. They are semi-transparent and white. — 

 When the eggs are at least 17 days old, the young are hatched, being 

 first whitish with violet ommatophores. hi contrast to this statement, how- 

 ever, Taylor quotes Scharff and Galn to the effect that the colour 

 may first be light red, dark green or yellow, gradually changing to pale 

 grey as the animals increase in bulk. 



