30 COLIMACEA. 



about two-thirds the length of the shell ; margin of the outer 

 lip thin, sharp, and not reflected, united to the columellar lip 

 below; columella smooth, sharp-edged, narrow, and attenuated; 

 inner lip spread over a small portion of the body volution. 



The shells of this genus are distinguished from the Lymncea, 

 by being destitute of the oblique fold on the columella. 



1. SUCCINEA AMPHIBIA, pi. IV, f. 20, 21. 



Succinea amphibia^ Drapernaud, Hist. Moll., p. 58, pi. 3, f. 

 22, 23; Lamarck, An. San. Vert., VI, p. 135; Pfeiffer, p. 67, 

 pi. 3, f. 36 and 38; Brown, Illust. Conch., p. 35, pi. 14, f. 41, 

 42; lb., First Ed., pi. 42, f.41, 42; Sowerby, Gen., f.3; Brard, 

 p. 72, pi. 3, f. 1 ; Turton, Man., p. 91, f. 73; Alder, Mag. 

 Zool. and Bot., II, p. 106; Succinea putris, Fleming, Brit. 

 An., p. 267; Jeffreys, Linn. Tr., XVI, p. 325 and 505; 

 Thompson, Ann. and Mag. Nat. Hist., VI, p. 35 ; Succinea 

 Miilleri, Leach, Moll., p. 78 ; Helix putris, Linne, Syst. Nat., 

 I, p. 1249; Donovan, Brit. Sh., pi. 168, f. 1 ; Helix succinea, 

 Midler, Verm., II, p. 97; Brown, Wernerian Mem., II, p. 530; 

 Maton and Racket, Linn. Tr., VIII, p. 218; Lymnea succinea, 

 Fleming, Edin. Ency., VII, p. 77 ; Helix limosa, Dillwyn, Des. 

 Cat., p. 965. 



Shell oblong-ovate, smooth, extremely thin and pellucid, and 

 glabrous, of a greenish or yellowish-amber colour ; body very 

 large ; spire very small, nearly perpendicular to the base, or 

 slightly oblique, consisting of three rapidly diminishing volu- 

 tions, terminating in an acute apex ; aperture very large, 

 occupying about three-fourths the shell, narrowed above, and 

 rounded beneath ; outer lip plain, sharp, and very thin. The 

 columella is visible through its entire length. 



2. Succinea gracilis, pi. IV, f. 26, 27. 



Succinea gracilis, Alder, Mag. Zool. and Bot., II, p. 106; 

 Succinea ohlonga, Leach, Moll., MSS. ; Brown, Illust. Conch., 

 p. 35, pi. 14, f. 34, 35; lb., First Ed., pi. 42, f. 34, 35; Turton, 

 Man., p. 92, f. 74 ; Alder, Cat. 6, No. 20 ; Succinea Pfeifferi, 

 Rossmassler, Icon., pi. 92, f. 46 ; Thompson, Ann. and Mag. 

 Nat. Hist., VI, p. 35 ; Succinea amphibia, var. b, Pfeiffer, p. 

 67, pi. 3, f. 37, var. y3; Nilson, p. 41, 7 and B; Drapernaud, 

 Moll., f. 23; Succinea putris, var. a, Jeffreys, Linn. Tr., XVI, 

 p. 325 and 505 ; Helix putris, Montagu, Test. Brit., p. 376, pi. 

 16, f. 4. 



