28 



IKIDTHJOF øKr.AM). 



M.-N. Kl. 



In .idditioii to ihcsc, Norway has two fV)rms, wliich somewhat deserve 

 the naine of \ari( tics, t)iit occur only rarely. Neither of them has been 

 found in Norway since they were discovered by their respective authors.' 



Va r. (| uadri fasciata Jkxskn, Indberetning, 1872, p. 82. 



Arion l^igdvatii I.kss. ct IVn.i.., Mon. Limac. Ital., 1882, p. 62. 



Ario)i snbfiisciis var. trmissylvanus Simrotii, Zeitschr. wissensch. Zool., 1885, p. 284. 



ArioH subfttscus var. alpestris Pollonera, Rec. Arionidar- Rt-g. Palearct., 1890, p. 12. 



With four lateral bands, 

 Q-sy.-A. '^s between the usual dark 

 lateral bands there are two 

 similar ones. One specimen 

 found at Aamot in Østerdalen. 

 The fact has been over- 

 looked that the name of Jen- 

 sex has pi'iority to this quadri- 

 fasciate variety, e. g. Taylor 

 uses the name var. pegorarii 

 Lesson A et Pollonera. In the 

 zoological Museum at Teien 

 I have found the type of the 

 variety. Judging from the date 

 (1870), the locality (Aaset), 

 the collector ISiebke) and the 

 two Limacidae which Jensen 

 in his paper states that he 

 received from the same col- 

 lector. Unfortunately, how- 

 ever, the label has no deter- 

 mination, and in the both 

 specimens of Arioii siibfusciis 

 the lateral bands are now 

 very indistinct. As Pollonera 

 states that the var. pegorarii 

 has an additional ectocone in the marginal teeth, I have examined the 

 radula in both specimens at the Toien Museum ; the teeth, however, are normal. 



'P- 



Fig. 21. Lower parts of the reproductive organs. 

 of Arioii sithfiisctis, ^1 . 



atr. atrium genitale, cp. epiphallus, o. oviduct, 



o.-sp.-d. ovispermatoduct, rec. receptaculum, rctr. 



retractor, v. d. vas deferens. 



' As to var. media Jensen (Indberetning, 1872, p. 85I, the description of the three small 

 specimens from Lillesand clearly indicates that the able author for once has been in 

 error, the animals without doubt being different young specimens of Arioii ater : whitish, 

 head and tentacles black, with longitudinal bands especially distinct on the shield, which 

 is pale yellow-green with indications of black pigmentation in its median part; tubercles 

 whitish with a bluish violet tinge and with little pale green spots, the furrows between 

 the tubercles of a darker bluish violet ; footfringe with dark transversal furrows, mucus 

 yellowish-green, footsole white ; the largest specimen of a darker colour than the 

 smaller ones. 



It may be of interest to those specialists who cannot procure the Jensen's paper 

 to read the original description : 



I 



