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 Gahvay. 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 difiFerent 

 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 fi'om the confined sjjace 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. Sowerhii, 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.iuirma. 



Limax carinatus, Gray. 



La Bergerie ; Monivea, County Galway ; Clifden, Cork ; under stones 

 in fields, and in tufted plants in gardens. 



Aug. 10. — ^A'ent 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 LaB. 

 varieties (if they are varieties). Nor does Mr. Gray's description agree 

 well with them ; the word " tesselated " does not accui-ately describe the 

 distribution of their colours. Their head and tentacles are never " black," 

 but always grcg, or bluish-grey. The usual colour is yellowish-brown, 

 often approaching to dusk)', sides pale, grey clouded with light yellow, 

 head and tentacles bluish-grey. 



Varietj/. — 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, " EUe 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 X. 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 



