1922. No. 5. ARIONIDAE OF NORWAY. ig 



„Forreste Halvdel af Skjoldet, Krops-Siderne og hele Fodens Under- 

 side fint, men stærkt stroet med morkegraat. Ryggen og den forreste ' 

 Halvdel af Skjoldet hvidagtig, hvilken Farve efterhaanden gaar over i 

 den mørkere paa Siderne og den forreste Halvdel af Skjoldet. Fodbræm- 

 men rødgul som hos var. albus, med meget tydeligere mørke Tværstreger. 

 Størrelsen som en fuldvo.xen Arion ater L. F'undet lode August ved \'ei- 

 kanten mellem Næs Jernværk og Askedalen". 



Var. nigro-punctata Malm, Arion. och Limac. Zool. Riksmus., 

 Öfv. Kongl. \'et.-Ak. Förh., 1876, p. 76. 



White with dark points on the shield and on the back, but there almost 

 not to be seen with the naked eye, whilst on the shield, especiallv in its 

 anterior middle part, the points merge together. 



This variety, too, is very rare. It reminds one of the next varietv, 

 but in any case should be treated separately for the present. Original 

 description : 



„Utaf denna intressanta varietet förefunnos i samlingen fem exemplar, 

 tagna vid Stavanger i Norge, af v. Friesex. 



Han liknar fullkomligt den typiska formen-, utom det att han har svarta 

 punkter på mantein och på ryggen af bakkroppen ; men här äro de knappt 

 synliga utan med hjälp af förstoringsglas. I synnerhet pä mantelns fram- 

 part, midt ofvan, äro dessa punkter ofta mer eller mindre sammantly tande. 

 Ett exemplar har till .och med likasom ett svart band på manteln, midt 

 ofvan". 



Somewhat similar in regard to the black pigment is a varietv from 

 Hardanger, presented to me by Dr. Odd Kixck-Eide, but as the colour to 

 a great extent was yellow instead of white, I will defer treatment pending 

 a closer examination of living specimens. 



\"ar. media Jexsex, Indberetning, 1872, p. 74, pi. I, fig. 11. 



Arion ater var. albolaleralis Roebuck, Journ. of Conch., 1883, p. 39. 



Back black, with no transition to the white sides ; foot-fringe orange. 



The principal distribution of this variety is the British Isles, and the 

 commonly employed name var. albolafcralis, was given to it b}' an English- 

 man. However, the name media Jexsex has priority, and the fact that this 

 has not been acknowledged, can only be ascribed to the original descrip- 

 tion with its coloured plate not being known. In order to correct the cur- 

 rent quotations which are not always quite exact, the original description 

 is reproduced here : 



„Af Universitets-Stipendiat Axel Boeck har jeg senere faaet en Teg- 

 ning af en X'arietet af Arion ater L., funden af ham ved Bergen, der lige- 

 ledes staar midt imellem Arion ater L. og den af flere som selvstændig 

 opførte \'ar. albus. — \'ar. nicdins : Ryggen og Rygsiden af Skjoldet ere 



' Surely this a printers error for bakerste. 

 2 i. e. " Lochea alba (L.) Malm". 



