94 LIMACINEA. 



5. LiMAX GAGATES ? VAR., pi. IX, f. 30. 



Limax gagates? mr., Forussac ? Drapernaud? Brown, Illust. 

 Conch., p. 56, pi. 18,* f. 21; Limax No. 4, Clarke, Ann. and 

 Mag. Nat. Hist., VI, p. 19- 



Shell oval, somewhat spoon-shaped, pointed above, and 

 rounded below ; membranaceous, and subopaque. 



Mr. Clarke says this shell differs materially in size and thick- 

 ness from L, variegatus, being smaller, more membranaceous, 

 and less opaque. The colour and markings of the animal are 

 also very different from other British species. 



Discovered by the Rev. B. J. Clarke, of Tuam, at Spire Hill, 

 La Bergerie, Queen's County, Ireland, who has most obligingly 

 sent me the use of beautiful drawings of the animal and shell 

 of this as well as of all the other Irish Limacida;. He says it 

 is always found on trees, and never in cellars and damp vaults, 

 &c., as L. variegatus. 



Mr. Thompson, in his paper on the Land and Fresh Water 

 Mollusca of Ireland, remarks, " It may be the L. carinatus of 

 Leach, or L. gagates of Drapernaud;" but I do not think Mr. 

 Clarke's description agrees with either of the above species. I 

 think it more than probable that it is an entirely new species. 



Family II— ANCYLID^. 



Animals fluviatile ; they breathe air, respiring on the surface 

 of the water; breathing apparatus situate in a bag-shaped cavity 

 on the back of the neck. 



Genus V.— ANCYLUS.— Muller. 



Shell thin, obliquely conical, patellieform ; vertex somewhat 

 pointed, short, turned backwards, and inwards, but not spiral; 

 aperture oval, or oblong, with the margins simple and entire. 



Section I. — Animals sinistral. 



1. AnCYLUS FLUVIATILIS, pi. X, f. 1, 2, 3. 



Ancylus jluviatilis, Muller, Verm., II, p. 194, No. 381 ; Dra- 

 pernaud, p. 48, pi. 2, f. 23, 24; Pfeiffer, p. 107, pi- 4, f. 44, 45; 

 Brard, p. 200, pi. 7, f. 3 ; Turton, Man., p. 140, pi. 10, f. 125 ; 

 Alder, Mag. Zool. and Bot., II, p. 116; Thompson, Ann. and 



