12 LYMNiECEA. 



Turton, Man., p. U8, f. 101; JolTrcys, Linn. Tr., XVI. p. 37-1; 

 Aider, Mag. Zool. and Bot., II, p. 115; Thompson, Ann. and 

 Mag. Nat. Hist., VI, p. 44 ; Lymmea putris, Fleming, Edin. 

 Ency., VII, p. 77; Lymncea limosa, Fleming, Brit. An., p. 274; 

 IlelLv pevfgra, Gmelin, Linn. Syst. Nat., p. 3659; Montagu, 

 Test. Brit., p. 373, pi. 10, f. 3; Helix putris, Pennant, Brit. 

 Zool., pi. 86, f. 137; Brown, Wernerian Mem., II, p. 530; lb., 

 Ency. Brit., VI, p. 461 ; Helix limosa, Brown, Wernerian 

 IMem., II, p. D30 ; Buccimim percgrum, Miillcr, V'crm., II, p. 

 134; Gulnaria percgera, Leach, Mull., p. 146. 



Variety 1. Ovate, aperture more dilated, pi. II, f. 20, 21, 

 22, 23. 



Lymncea ovata, Lamarck, VI, II, p. 121 ; Kenyon, Mag. 

 Nat. Hist., II, p. 425, i.g; Lymnceus ovatus, Pfeiffer, p. 89, 

 pi. 4, f. 21 ; Limncus ovatus, Drapernaud, p. 50, pi. 2, f. 30, 

 31 ; Lymneus ovatus, Brard, p. 142, pi. 5, f. 4, 5 ; Lymncens 

 ovatus, Rossmassler, Icon., I, p. 100, pi. 2, f. 56; Limnea lineata. 

 Bean, Mag. Nat. Hist., VII, p. 493, f. 62. 



Variety 2. Outer lip expanded, and with an internal rib, 

 pi. II, f. 17. 



Helix auricidaria, var., Maton and Racket, Linn. Tr., VIII, 

 p. 218, pi. 5, f. 8*; Lymnea marginata, Michaud, Compl., p. 

 88, pi. 16, f. 15, 16. 



Variety 3. Shell small, stronger ; spire but slightly pro- 

 duced ; the outer lip not attenuated, pi. II, f. 24, 25. 



Helix lutea, Montagu, Test. Brit., p. 380, pi. 16, f. 6; Maton 

 and Racket, Linn. Tr., VIII, p. 222. 



Variety 4. Spire acute, and tapering. 



Lymneus acutus, Jeffreys, Linn. Tr., XVI, p. 373. 



Variety 5. With the volutions reversed. 



Limnea lineata, Bean, 1. c; Sturm, pi. 39' 



Shell ovate, thin, subpellucid, yellowish horn-coloured, slightly 

 "wrinkled longitudinally; body very tumid, and large; spire very 

 short, consisting of three or four rapidly decreasing volutions, 

 terminating in a sharp apex; aperture very large, oval, about 

 three-fourths the length of the shell ; outer lip thin ; inner lip 

 broadly reflected on the columella. 



This species is subject to considerable variety, both in form 

 and size; and is plentifully diftused in almost all ditches, ponds, 

 and lakes, throughout Britain and Ireland. 



