CLASSES, ORDERS, ETC. ?I 



acute, tapering ; mouth oval, large. Length i^ to 2 inches. In 

 stagnant and slow-running waters. Common. L. stagnated 



(e) Shell conical, tapering, thick, opaque, dull brown ; whorls 

 six to seven, convex, the last whorl occupying frds the length of the 

 shell ; spire produced, acute ; suture rather deep, circled by a 

 narrow white line; mouth ovate, outer lip marked with brown 

 or violet. Length J to fths inch. Ponds, marshes, and lakes. 

 Common . L. palustris^ 



(/) Shell oblong-oval, turreted, pale brown or yellowish-horn 

 coloured, rather glossy ; whorls five to six, convex, deeply 

 separated from one another ; spire produced ; apex acute ; suture 

 very deep ; mouth ovate, oblong ; umbilical cleft distinct. Some- 



Fig. 28. Limncea stagnalis. 



margin nearly parallel to the columella which is straight, the upper edge reach- 

 ing the commencement of the spire which is sharp ; v. acuta, smaller, more 

 oblong, having the last whorl and mouth proportionably narrower. 



34 v. fragilis, smaller, narrower, thinner, amber-coloured ; v. labiata, 

 dwarfed, with the outer lip thickened and reflected ; v. roseolabiata, slightly 

 narrower, brown-black, mouth bordered interiorly with rose-violet ; v. elegan- 

 tula, nearly scalariform, suture deep. 



55 v. corva, larger, swollen, opaque, blackish, violet-coloured within ; v. 

 albida, white ; v. obesa, very tumid ; v. conica, conic, greyish-white, suture 

 deep, umbilical cleft present ; v. tincta, shorter, broader, light-brown, mouth 

 purplish; v. lacunosa, with flattenings, depressions, and protuberances; v. 

 elongata, slightly larger, slightly narrower, opaque, brown, spire much produced; 

 m. decollation, spire decollated. 



