APPENDIX. 129 



Animal pale yellow, tessellated with brown, head and ten- 

 tacles black ; mantle granulated, with a furrow near its margin ; 

 dorsal keel amber-coloured, and very conspicuous; sides cream- 

 white. 



Found in open situations. 



6. LiMAX GAGATES, pi. XXV, f. 14, 15, 16, 17. 

 Limax gagates, Drapernaud, pi. 9? f. 1> 2; Clarke, Ann. and 



Mag. Nat. Hist., XII, p. 339, pi- 12, f. 16 to 22; Brown, Illust. 

 Conch., p. 131, pi. 58, f. 4, 5, and pi. 59, f. 2, 3, 4, 5, 6. 



Animal shining black ; body with subrugose stria?, the back 

 carinated ; mantle truncated posteriorly, and granulated ; cir- 

 cumscribed by an elevated ridge, which meets in a point near 

 the pulmonary orifice, making the upper portion of the mantle 

 appear more prominent than the rest ; back abruptly carinated 

 its whole length from the mantle ; when at rest the keel pro- 

 jects above the mantle, and forms a carinated ridge. 



Variety 1 . Ferussac ; pi. XXV, f. 1 8, 1 9, 20. Lead-coloured 

 or greyish-black. 



Variety 2. Clarke. Brown ; with the sides of the mantle 

 yelloicish. 



Found by the Rev. B. J. Clarke, at Tourmakady Lodge, on 

 the borders of Lough Mash, Ireland. 



7. LiMAX ATER? YOUNG, pi. XXVI, f. 13. 



Genus V.— ANCYLUS. 



Ancylus fluviatilis, pi. XXIV, f. 25. 

 Animal conical ; body attached to the foot its whole length ; 

 tentacles triangular, compressed, with an auricle at their base. 



CLASS CONCHIFERA. 



ORDER MONOMYARIA. 



Genus I.— DREISSINA. 



Dbeissina polymorpha, pi. XXVII, f. 5, 6. 

 Animal with the mantle closed all round, with the exception 

 of three apertures; the anterior one for the passage of the foot, 

 S 



