FAMILY LYMNiEACEA. 165 



varying to light grey, profusely speckled with black clots. The 

 shell partakes of the form of L. palustris, differing, however, in the 

 sutures being more constricted, which gives the upper part of the 

 whorls a truncately swollen character, while it is of very much 

 smaller size. 



6. Lymnsea glabra. Smooth Lymncea. 



Shell ; elongately turreted, almost subulate, minutely umbilicated, 

 yellowish horny, thin, smooth and silky, spire 

 rather cylindrical, whorls eight, slopingly flatly 

 convex, densely extremely finely striated, mar- 

 gined at the suture ; aperture very small, pyri- 

 formly ovate, sometimes ribbed within, colu- 

 mella arcuately twisted, lip reflected over the 

 umbilicus. 



Buccinum glabrum, M tiller (1774), Verm. Hist, part ii. p. 135. 



Helix octona, Pennant (1777), Brit. Zool. ed. 4. vol. iv. p. 138. pi. lxxx. 

 f. 135 (not of Linnseus). 



Helix glabra, Gmelin (1788), Syst. Nat. p. 3658 (not of Studer), 



Bulimus glaber, Bruguiere (1789), Bnc. Meth. Vers, vol. i. p. 312. 



Bulimus leucostoma, Poiret (1801), Coq. de V Aisne,^. 37. 



Helix octanfracta, Montagu (1803), Test. Brit. p. 396. pi. ii. f. 8. 



Limneus elongatus, Draparnaud (1805), Hist. Moll. p. 52. pi. iii. f. 3, 4. 



Lymncea octanfracta, Fleming (1814), JEdin. JSncyc. vol. vii. p. 78. 



LymncBa leucostoma, Lamarck (1822), Anim. sans vert. vol. vi. part 2. p. 62. 



Lymncea elongata, Sowerby (1823), Gen. Shells, Lint. f. 6. 



Limneus subulatus, Kickx (1830), Syn. Moll. Brabant, p. 60. f. 13, 14. 



Stagnicola octanfracta, Leach (1831), Tart. Man. p. 141. 



Omphiscola glabra, Beck (1837), Ind. Moll. p. 110. 



Limnceus glaber, Gray (1840), Turt. Man. ed. 2. p. 242. pi. ix. f. 106. 



Leptolimnea elongata, Swainson (1840), Treat. Malac. p. 338. 



Limncea variabilis, Millet (1854), Moll. Maine-et- Loire, p. 51. 



Limncea (Lymnus) glabra, Moquin-Tandon (1855), Hist. Moll. vol. ii. 

 p. 478. pi. xxxiv. f. 36 to 37. 



Hab. Northern and Central Europe. England. (Partially diffused in drains, 

 ditches, and shallow pools.) 



This is one of the few European inland mollusks which, like 

 Physa hypnorum, is peculiar to the Germanic portion of the Con- 

 tinent. There is no record of its having been found on the Lusi- 

 tanian side of the Pyrenees. It commences to appear north of that 



