LYMN^CEA. 13 



We found variety 1, of the large size, figured in pi. II, f, 20, 

 21, 22, 23, in ditches at Bury, Lancashire. 



7. Lymn^a involuta, pi. II, f. 27. 



Limneus invohitus, Harvey; Alder, Mag. Zool. and Bot., II, 

 p. 115; Ann. Nat. Hist., March, 1840, p. 22; Thompson, Ann. 

 and Mag. Nat. Hist., VI, p. 45 ; Brown, lUust. Conch., p. 29, 

 pi. 18, f. 5. 



Shell very thin, pellucid, shining, rendering the columella 

 visible throughout its whole length ; colour, pale amber ; body 

 very large, enveloping the spire, and provided with coarse, longi- 

 tudinal striae; spire very short, sunk, truncated at the apex, and 

 sometimes concave, consisting of three volutions, none of which 

 are visible in the profile of the shell ; aperture very large, wide 

 at the base, and extending to the apex ; margin reflected only 

 where it joins the pillar. Length five lines and a half; breadth 

 three lines and a half. 



Its general aspect is not unlike Akera jiexilis, in consecjuence 

 of the aperture extending to the apex, and the appearance of 

 the columella. 



This interesting and new species was discovered by William 

 Henry Harvey, Esq., of Limerick, in a small alpine lake on the 

 mountain of Cromaglaun, near the lakes of Killarney, Ireland. 

 In his cabinet, and those of William Thompson, Esq., Mr. 

 Hyndman, and Dr. Drummond of Belfast, and Robert Ball, 

 Esq., Dubhn. 



Genus VI.— AMPHIPEPLEA.— Nilson. 



Shell subovate, nearly globular, very thin, membranaceous, 

 and flexible ; body extremely large ; spire very small, and sub- 

 acute ; outer lip not continuous, slightly inflated above, and 

 acute at the base ; pillar lip provided with a single plait, or 

 twist, and a httle reflected on the base of the columella. 



1 . Amphipeplea glutinosa, pi. HI, f. 7, 8. 



AmpMpeplea glutinosa, Nilson, Moll. Sacc, p. 58; Rossmass- 

 ler, Icon., I, p. 93, pi. 2, f. 48; Limneus glutinosus, Drapernaud, 

 p. 50; Turton, Man., p. 120, f. 103; Michaud, pi. 10, f. 13, 14; 

 Alder, Mag. Zool. and Bot., p. 115; Fleming, Brit. An., p. 275 ; 

 Limneus glutinosus, Jeffieys, Linn. Tr., XVI, p. 371; Limnea 

 glutinosa, Sowerby, Genera, f. 5 ; Lymncea glutinosa, Brown, 



