234 PNEUMONOBRANCHIATA. 



Var. 1. Subovate, aperture more dilated; spire 



acute. 

 Limneus ovatus. Drap. p. 50. t. 2. f. 30, 31. 

 Lymneus ovatus. Brard, p. 142. t. 5. f. 4, 5. 

 Lymnaea ovata. Lamarck, vi. ii. p. 161.; Kenyon, 



Mag. Nat. Hist. ii. 425. f. g. 

 Helix limosa. Linn. ? Mont. p. 381. t. 16. f. 1. 

 Lymnaeus ovatus. Rossm. Icon. i. 100. t. 2. f. 56. 

 Bulimus limosus. Pioret, Prod. 39. 

 Limnea lineata. Bean, Mag. Nat. Hist. vii. 493. 



f. 62. 



Var. 2. Spire rather tapering, acute. 



Lymneus acutus. Jeffreys, Linn. Trans, xvi. 373. 



Var, 3. The shell thicker, and the outer lip not 

 attenuated; spire scarcely exserted. 



Helix lutea. Mont. p. 380. t. 16. f. 6.; Linn. 

 Trans. Soc. viii. 222., xiv. 169. 



Var. 4. Shell moderate ; spire very short, eroded, 



often concentrically grooved. 

 Gulnaria lacustris. Leach, Mollusc, p. 146. 

 Lymnea lacustris. Broivn, Brit. Shells, t. 42. 



f. 24, 25. ?; Potiez and Michaud, Gal. Moll. i. 210. 



t. 22. f. 11, 12. 



1. Monstrosity with the outer lip thickened, 

 with an internal rib, and expanded. (Maton, 

 Linn. Trans, viii. 218. t. 5. f. 8.* Montag. Supp. 

 129.) 



Lymnea marginata. Michaud, Compl. 88. t. 16. 

 f. 15, 16. 



Lymneus pereger. Jeffreys, 1. c. 



