FAMILY LYMN^ACEA. 159 



2. Lymnsea auricularia. Ear-shaped Lymncea. 



Shell ; somewhat squarely semiglobose, compressly umbilicated, 

 rather thin, pallid horny, spire very small, sharp, whorls three 

 to four, convex, irregularly striated in the direction of the lines 

 of growth, sometimes evanescently obscurely irregularly ridged 

 and malleated in the opposite direction, extremely rapidly 

 enlarging, last whorl abruptly widely auriculaiiy inflated; 

 aperture very large, outer lip thinly expanded, columella cal- 

 lously twisted, lip appressly dilated over the umbilicus. 



Helix auricularia, Linnaeus (1758), Syst. Nat. 10th edit. p. 774. 



Buccinum auricula, Miiller (1774), Verm. Hist, part 2. p. 126. 



Turbo patulus, Da Costa (1774), Test. Brit. p. 95. pi. v. f. 17. 



Bulimus auricularius,~Brugmeve (1789), JEnc. Meth. Vers, vol. i. p. 304. 



Limnceus auricularius, Draparnaud (1801), Tail. Moll. p. 48. 



Radix auriculatus, De Montford (1810), Conch. Syst. vol. ii. p. 207. 



Limneus acronicus and Hartmanni, Studer (1820), Kurz. Vers. p. 93. 



Limneus acutus, Jeffreys (1830), Trans. Linn. Soc. vol. xvi. p. 373. 



Oulnaria auricularia, Leacli (1831), Turt. Man.^. 148. 



Limneus ampullaceus, Rossmassler (1835), Leon. Moll. vol. ii. p. 19. f. 124. 



Gulnaria ampla, Monnardii, and Hartmani, Hartmann (1842), Hrd. und 



Suss. Gast. p. 69 to 72. pi. v. to vii. 

 Limncea canalis, Villa (1851), Bup. Hist. Moll. vol. v. p. 482. pi. xxii. 



f. 12. 

 Limncea (Gulnaria) auricularia, Moqnin-Tandon (1855), Hist. Moll. vol. ii. 



p. 462. pi. xxxiii. f. 21 to 31. and pi. xxxv. f. 1 to 10. 

 Hab. Nearly throughout Europe, but local. Siberia. Cashmere. Central 



and southern England and Ireland. (In ponds, lakes, marshes, or 



on aquatic plants.) 

 The shell of this species is composed of a whorl less than that of 

 the preceding species, and it is especially distinguished by its 



