Rev. B. J. Clarke on Irish species of the genus Limax. 333 



Having since that period had abundant opportunities of veri- 

 fying my former observations, and being fortified by the opinion 

 of naturahsts who are more experienced in detecting specific di- 

 stinctions, I venture now with every confidence to bring them 

 forward as new to the British catalogue. My object in once again 

 noticing the other British species, already known and described, 

 is in order to introduce the new additions in their proper places, 

 and thus afford a greater facility for determining the value of 

 their specific distinctions by comparison. 



It is not my intention to include the genus Avion in the pre- 

 sent communication, as I feel that there are many points, con- 

 nected with the two species* already described as British, which 

 would require much more attention than I have as yet been en- 

 abled to bestow upon them. 



In the following catalogue I have adopted the divisional or 

 sectional arrangement made use of by Mr. Gray in his edition of 

 ' Turton's Manual,^ but with considerable modifications, rendered 

 necessary in order to include the two new Irish species. 



Order PNEUMONOBRANCHIATA. 



Fam. Helicid^. 



Genus Limax. 



End of tail tapering and destitute of any gland ; the pulmo- 

 nary cavity in front of the body, respiratory hole toward the 

 hinder part of its edge or behind the middle ; mantle shield-like, 

 entirely inclosing the shell, which is flat, oval or oblong, without 

 any visible spire. Infra-oesophageal ganglion having two fissm-es 

 on the under side, presenting on each side of the medial line three 

 gangliform eminences. 



* Mantle produced behind, marked with concentric strice ; tail partially 

 keeled; shell flat. 



1. Limax maximus, Linn. (PI. X. fig. 1, 2.) 

 L. maculatus, Leach. 

 L. cinereus, Muller. 

 L. antiquorum, Ferussac. 



** L. Cinereus, maculatus et immaculatus, clypeo brevi, corpore stri- 

 ate aut rugose, apertura laterali subpostica." — Draparnaud. 



This well-known species appears to be universally distributed 

 over Ireland. The varieties as they occur in Ireland are as fol- 

 lows : — 



Var S F^rus j " ^^"^^^"^ immaculatus." Co. Galway, B. J. C. 

 * Arion hortensis and A. ater. 



