206 Mr. W. Thompson's Catalogue of Irish Mollusca. 



The Arion described above may probably be only such ; but the 

 youngest specimens I have ever taken of A. ater (and I have ob- 

 tained them very young), were entirely of a light yellow, or green- 

 ish-yellow colour, in one or two instances having very obscure and 

 similarly placed dusky fascia? on the shield only. M. Bouchard sup- 

 poses the L. filans of Hoy to be the young of his L. arboreus ; from 

 my experience, I feel assured of its being the young of L. agrestis, 

 as I have almost always found it under stones, generally accom- 

 panying the full-grown L. agrestis, and very rarely " on trees." 



Benjamin J. Clarke. 



La Bergerie, Aug. 5, 1840. 



Additional localities may here be given for the following species : 

 Helix lamellata (H. Scarburgensis). Wood near the bridge of 

 Errif, county Mayo, between Westport and Killery harbour. — W. T. 

 Helix radiatula. With last. 



Helix lucida, Drap. Near Clifden, Connemara. — W. T. 



Helix virgata. 



When the first part of the paper was printed, I was unable to give 

 a western locality for this species, but specimens collected within a 

 few miles of Roundstone, on the coast of Galway, have since been 

 sent me by Mr. William McCalla, of that place. 



Helix hybrida. 



The examples of this Helix, before alluded to in the present paper 

 (p. 22), differed only from the ordinary H. nemoralis in having the 

 lip of a rose colour or brown, and in its being margined with a white 

 line. By R. Leyland, Esq., of Halifax (Yorkshire), I have lately 

 been favoured with a number of specimens of H. hybrida, which bear 

 much the same relation to H. hortensis that the former do to H. 

 nemoralis. They are all yellowish-brown, with the lip varying from 

 a rose colour to white. Mr. Leyland remarks, in reference to them, 

 " The situation in which this Helix is met with, is on the banks of 

 the canal between Keighly and Bingley, and about two miles from 

 each place. The extent to which it is confined is not more than 

 thirty paces in length, beyond which only an occasional straggler 

 could be met with, and even then at no great distance from the 

 principal station. H. hortensis and H. nemoralis are both found in 

 the same place as H. hybrida, but are common along the whole line 

 of the canal so far as I have examined, while the last seems confined 

 to the small space before-mentioned, and is there rather numerous. 

 The vegetation of this spot consists of the common grasses, Rubi, a 

 few of the most common Umbelliferce and nettles ; upon the last of 

 these a majority of the specimens were found." 



In the south islands of Arran, situated near the entrance to Gal- 

 way bay, the few following species were, in June, 1834, obtained by 

 Mr. R. Ball and myself : Helix nemoralis (extremely large), H. 

 cellaria, H. crystallina, H. umbilicata, H. ericetorum (one pure 

 white), H. hispida, Mull. ; Clausilia nigricans (rugosa), one of 

 crystalline transparency, as were nearly all of Pupa umbilicata, 

 which is here abundant. 



