284 
MOLLUSCA. 
by him from Youghal. In the North it has occurred to myself. Finnoe, 
County Tipperary, Mr. Waller, 1846. 
L, agrestis, Linn. 
This, the small rough yellowish species, is very common throughout 
the North, and I believe Ireland generally. 
Queen’s County and County Galway. Common ; of all shades and 
degrees of colour and markings, from the pale yellowish- white of L.filans 
to the darkest variety of reddish-brown. Several seen at Tory Island by 
Mr. Hyndman. Yesterday, July 21st, I had the gratification of seeing 
them repeatedly let themselves drop down to the table from the lid of a 
tin box, where, for the purpose of taking some drawings of the different 
varieties, they were held. 
A similar feat was performed by the full-grown and dark varieties, 
which were on the same box with L. jilans, but they did not appear to 
possess the same facility, and were more reluctant in resorting to this 
expedient for escaping from the confined space on which they were placed. 
Turton, in his description of the shell of this species, makes no mention 
of the membranaceous margin. I have now eight specimens before me, 
taken from the animals this morning ; the following is an attempt at their 
description : — shell rather variable ; in shape usually oblong oval, some- 
what larger than those found in L. Sowerbii, but much thinner, and with- 
out the same abrupt thickening in the centre ; with a membranaceous 
edge, all of them concave, as much so in proportion to size as in L. parma. 
liimax carinatus, Gray. 
La Bergerie ; Monivea, County Galway ; Clifden, Cork ; under stones 
in fields, and in tufted plants in gardens. 
Aug. 10. — Went with Dr. Ball to the circular road, and obtained a few 
specimens of this species ; they were of a rich dark-brown with orange- 
brown keel ; they are very well represented in Gray’s fig. — Clifden, July, 
1840 ; Cork, Mr. Humphreys. 
There is not any figure in Ferussac to which I could refer the La B. 
varieties (if they are varieties). Nor does Mr. Gray’s description agree 
well with them ; the word “ tesselated” does not accurately describe the 
distribution of their colours. Their head and tentacles are never “ black,” 
but always grey , or bluish-grey. The usual colour is yellowish-brown, 
often approaching to dusky, sides pale, grey clouded with light yellow, 
head and tentacles bluish-grey. 
Variety. — Deep dusky or nearly black, sides pale grey, head and 
tentacles bluish-grey. 
The young have the keel yellow-coloured, which in adults is generally 
the same colour as the back. The extreme dark colour of the variety led 
me at first to confound it with the L. gagates of Ferus. He remarks of 
one of the varieties of L. gagates , “ Elle est d’un gris bluatre ou nouratre 
.... plus pale lateralement.” I have seen but a single individual in 
Monivea ; it was identical with the variety. 
The internal shells are a size smaller than those of L . agrestis ; they 
have no membrane on the edge, are opake, much thicker, and not con- 
cave ; the peculiar thickening process in the centre gives them the appear- 
ance of having a marginal zone, or as if a smaller-sized shell were placed 
on the top and centre of the larger, leaving a rather broad margin, which 
is usually of a rufous colour towards the top. 
I find that this species is capable of forming a slimy thread in the same 
