2 to MiiNiiriliAl'll 111' lililTISTI LAXli AX|i l'l!7-:sinVATF,l! MOLirSOA. 



Sri'.-( iKXrs A rill iirul IIS Lcssoiia. 



Arion intermedius Normand. 



1S.">2 Liiihu: intermedius Xonuaml, ilescr. I^imar. n.iin-., |i. II. 



1S.">:> Anon //-/r/(,v I-'.hI.i's vV Haiilev, Hisl. Moll. Aiiiiii., iw, \k '.I, [il. F.F.F., f 2. 



IS.SI — 'rrrnir,,^,/^ \',n'\'\rn-, -U'lnvn lU- i 'nurli. . ]i. :UII, ]il. I.'i. 



].SS+ — iii:ihilli,iiiii.-^ Uiiuildii, .Jimiii. il'' < ' -Il, |i. M, 



l.SS.'i — liiiiiiiiins Siniidlli, Zcilschr. W'issni^cli. Zo.il., \h -Js!!, |il. 7, f. 41. 



ISS!) — nnillfni i '(jll.iiicra, NiKiv. ('n)il rib. , ].. I!), f. 7-10. 



KSIi7 l!f(iiiiiiliini,K iiilcniinllitx AlaUille, Her. et iMai,'. Zo(j1, ]i. .">7. 



1867 — hU'iiiiilis Drtiiicl,, Mnll. tVite-d'Oi', \\. '27. 



ISIi.S — III,, hill,', Kau.ldu, .Iduni. (le (.'nm-h., ).. 142. 



I.sr.i) — i;'ii,l,niii,.s Let,, i;e\-. et Jla.i;-. Zeiil., p. .')!. 



( 



[ISTORY. — Ariiiii iiiti'riiiciliiis \iiitcr- 

 ii/i'i/iiis, iiitennediatej was fir.st clearly 

 iliscriuiiiiateJ b}' Ndnuaiid in 1S,52, 

 lint lii.s (lescnptiiiu was uN-erloukeil. 

 It is the Afiiiii /iiciiii/iiiii(/iis n\' Iluttoii, 

 ami is alsii the .\ r/'nii //n riis of Aider, 

 Mo([iiiii-'raiidriii, Forbes and Halde}', 

 and iitber authors, but the species was 

 111 it at that period generally accepted 

 as valid, but relegated to the rank of 

 a di.iiilitfid or spiirimis species b)' 

 coiiteuipiirary authoi's. 



Ill iss.'j, l)r. yimroth iudepeiideutly 

 differentiated the species, firmly es- 

 tablislii'd its specific status and apiplied 

 tn it the very apiirri]iriate name of 

 iiiiiiliHiis, which, iiiifiirtuiiately cannot 

 be niaiiitaiued. 



,1 . /;//rr;;/('(////.s'ishere assncia ted with 

 Dr. i;. F. 8cliarif, .M.ll.I.A., of Dublin, 

 its recent discoverer in this country, 

 and the first in liiritaiii to make 

 kiiiiwii its really distinctive characters 

 and wide distribution, lie is also the author of many able papers npou 

 ( Jeognqihical distribution and the mollusca generally, as well as of the most 

 aiithoritiitive and im|iiirtaut work I'.xtaut upim the (Slugs of Ireland. 



Aridii inti-nui-ilimf bi'lougs to the siili-gcniis Ariiniciihis, a group insti- 

 tuted liy Ijessona, for the reception of a, iiuuiber of primitive little . I /■/(//(.-.■ 

 occurring in iSpain, Moi-ncco, Sardinia., and in the higher regions of the 

 Alps, and characterized by the iiosition of the sexual orihce between the 

 liiilmonary ajiertiire and the right oniin.-i.lophore, and thus in this particular 

 bilking the ^1 /■/mis with < ir,iii/<i/in-iis, in \\ Inch there is a. si nil far arrangenient. 



Diagnosis. .1. iiiti'mniUns, though pvcsenting a cert,-iiii resemblance 

 to (lie two ]ivci'i'iliiig species, is iiiiich soflci- and mure gelatinous to the 

 touch, smaller in si/.e, piilcr in roloiir, ninrc indistiiicl in banding, and 

 e.Miiles a bright yellow \v;iler\' iiiiicus, winch tends to acciimnlate at oppo- 

 site ends of the body. It is, liowe\ei', sli,-i,rply sejianited from all its 

 congoners in lliis coiiiilry by the po.^session ot small liut prominent dermal 

 liibercles, eaeli of wliieh is siiniioinileil liy a. jelly-like jmiiited s|iike, a 

 peculiarity which lia.s ea.nied lor it the title ol the "hedgehog snail." 



^y^^UL^t^^u, 



