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



HaAang since that period had abundant opportunities of veri- 

 fjang my former observations, and being fortified by the opinion 

 of natm-ahsts who are more experienced in detecting specific di- 

 stinctions, I ventui'e now with every confidence to bring them 

 forward as new to the British catalogue, ^ly object in once again 

 noticing the other British species, already kno-mi 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 Arion 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 requii-e 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 

 ' Tm-ton'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 ca\'ity 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 nsible spire. Infra-oesophageal ganglion hav-ing two fissm-es 

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

 gangliform eminences. 



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

 keeled; shell flat. 



1. Limax 7naximus, Linn. (PL X. fig. 1, 2.) 

 L. maculatus. Leach. 

 L. cinereus, M'dller. 

 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 : — 



^" "■ p!^P' > " Cinereus immaculatus." Co. Galway, B. J. C. 



* Arion hortensis and A. ater. 



