LIMACINEA. 93 



Mr. Clarke remarks, that "the peculiar thickening process in 

 the centre gives them the appearance 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." 



Inhabits gardens, in the vicinity of London, and at Hamp- 

 stead; also at La Bergerie; Monivea, County of Galway, under 

 stones in fields, and in tufted plants in gardens, according to the 

 Rev. B. J. Clarke, by whom it was first noticed in Ireland. 



Mr. Thompson (p. 63) mentions a species obtained by him, 

 in 1840, near Clifden, Connemara, Ireland, while on a tour with 

 Professor Forbes, King's College, London, and Robert Ball, 

 Esq., of the Castle, Dublin, which were more nearly allied to 

 the L, gagates of Drapernaud, than the British specimens of 

 L. carinatus, Mr. Ball has since found it on the Circular road, 

 DubHn. 



4. LiMAX AGRESTIS, pi. IX, f. 29- 



Limax agrestis, Linne, Syst. Nat., p. 1082, No. 6; Gmelin, 

 Linn. Syst. Nat., p. 3101, No. 6; Miiller, Verm., 11, p. 8, No. 

 204; Drapernaud, Hist, des Moll., p. 126, pi. 9, f • 9 ; Sturm, 

 Fau. Abthl., VI, p. 1, pi. 4; Pennant, Brit. Zool., IV, p. 41 ; 

 Lamarck, An. San. Vert., VI, pt. 2nd, p. 50 ; Fleming, Brit. 

 An., p. 256; Turton, Brit. Fau., p. 133; Pfeiffer, I, p. 21; 

 Nunneley, Trans. Phil. Soc. Leeds, pi. 1, f . 4 ; Alder, Mag. 

 Zool. and Bot., II, p. 105; Thompson, Ann. and Mag. Nat. 

 Hist., VI, p. 61 ; Forbes, Mai. Mon., p. 6; Brown, Illust. Conch., 

 p. 56, pi. 18,* f. 20 ; Limacella obliqua, Brard, p. 148, pi. 4, f. 

 7, 8, 17, 18, shell; Limacellus obliquus, Turton, Man., p. 26, 

 pl.3, f. 17. 



Shell variable in form, very small, thick, hard, and of an 

 oblong square, rounded at the corners ; colour, pale yellowish- 

 white, or gray ; a little concave, and provided with a membra- 

 neous edge. 



This species is destitute of the abrupt thickening in the 

 centre of the shell, which is so strongly characteristic of L. 

 carinatus. 



Common in fields throughout Britain ; Mr. Clarke found it 

 in Queen's County, and County of Galway, Ireland. 



Mr. Clarke considers L.Jilans, var. 7 of Ferussac, as belong- 

 ing to this species. 



