334 Rev. B. J. Clarke on Irish species of the genus Limax. 



Var. /3. Drap. "1 " Cinereus, clypeo dorsoq. maculis nigris." Co. 

 Var. ^ Ferus. / Cork, R. Ball, Esq. 



Var. y. Drap. 1 " Clypeo maculis, dorso fasciis nigris." Queen's 

 Var. V. Ferus. / co. and co. Gahvay, &;c., B. J. C. PI. X. fig. 1. 

 Var. Nilsson's ? 1 " Niger, albam carinam." Co. Cork, R. Ball, Esq.; 

 Cinereo-niger. / Queen's co., B. J. C. PI. X.fig. 2. 



This latter variety, of which I have given a figure (PI. X. fig. 2.), 

 is very remarkable. The middle band of the foot and the dorsal 

 keel are white, the rest of the animal shining black, ^nth a few 

 occasional lighter blotches. 



The variety which is of most usual occurrence in Ireland is 

 that of var. v, Ferussac. (PI. X. fig. 1.) 



The internal shell (PI. X. fig. a.) is well described by Dr. 

 Turton. 



2. Limax arboreus ? M. Bouchard Chantreux, Cat. des Moll, terres. et 

 fluv. du Pas de Calais. 



L. glaucus, mihi. (PI. XI. figs. 4 to 10.) 

 L. Albus flavescens, glauco variegatus, clypeo dorsoque duabus 



fasciis nigricaiitibus, tentaculis obscuris. — Clarke. 



Hub. On trees which are covered with moss, particularly ash and 

 beech. 



This species I at fii'st dubiously referred to the Limax flavescens 

 of Ferussac in my former communication to Mr. Thompson (see 

 ' Annals and Mag. of Nat. Hist.^ vol. vi. p. 204), previous to my 

 seeing M. Bouchard's memoir. I there remarked that this Limax, 

 of whose identity I was then doubtful, " might perhaps be refen-ed 

 to L. arboreus, on account of its possessing certain characters 

 and habits, diflfering from what is contained in any description of 

 L. variegatus or its varieties ; I consequently compared my spe- 

 cimens carefully with M. Bouchard's memoir — an opportunity of 

 doing which was afforded me through the kindness of Messrs. 

 Gray and Thompson — and I was much gratified to find a pei-fect 

 agreement in the specific characters as well as in the peculiar 

 habits of the animal." Subsequent observation has not altered 

 my opinion as to its identity with this species, but not having 

 seen either a di-awing or specimen, I am still under the necessity 

 of referring it to Limax arboreus with a mark of doubt attached. 

 Should the species be found eventually to be distinct from L. ar- 

 boreus of Bouchard, I have suggested the name of Limax glau- 

 cus as descriptive of its very peculiar hue. 



I shall now give a more detailed description of the species. 



Animal of a gelatinous translucency ; colour smooth, bluish 

 gray (" bleu glauque'') or neutral tint colour. Back marked with 

 a whitish band, which commences immediately behind the shield, 

 where it is broadest, and gradually diminishes in width until it 



