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 fascize 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. 
Heliz radiaiula. With last. 
Heliz 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, or the coast of Galway, have since been 
sent me by Mr. William McCalla, of that place. 
Heliz 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 Umbellifere 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. 
