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



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

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



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

 Var. p. Ferus. j co. and co. Galway, S^c., B. J. C. PI. X. fig. 1. 

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

 Cinereo-niger. J Queens co., B. J. C. PI. X. fig. 2. 



This latter variety, of whicli 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, with 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 nigricantibus, tentaculis obscuris. — Clarke. 



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

 beech. 



This species I at first 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 y 

 of whose identity I was then doubtful, " might perhaps be referred 

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

 and habits, difi*ering 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 afibrded me through the kindness of Messrs. 

 Gray and Thompson — and I was much gratified to find a perfect 

 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 drawing 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 



