66 LIMNJEID&. 



somewhat abruptly, apex rather acute ; suture very deep ; mouth 

 nearly oval ; outer lip sharp ; inner lip continuous with the 

 other, spread on the base of the penultimate whorl ; umbilical 

 cleft distinct ; fold moderately thick. 



Inhabits marshes, muddy streams, and ditches, as 

 well as rocks by the side of waterfalls, in every part 

 of Great Britain. This little mollusc varies consider- 

 ably in size and colour according to the nature and 

 position of the localities in which it occurs. It not 

 only lives in marshy and low-lying places but is 

 equally abundant in mountainous districts, and it 

 appears to be as much at home on land as it is in the 

 water. It lays from twelve to twenty eggs, and the 

 capsules which contain them are usually deposited on 

 the mud. 



Var. i. major. Shell larger; whorls more swollen, body 

 whorl much larger than usual. Penzance (Millet and Barlee), 

 Newton Nottage, Glamorganshire (J. G. J.), B.C. Near Bir- 

 mingham (G. Sherriff Tye), J.C. 



Var. 2. elegans. Shell much larger, more solid, and slender, 

 greyish-white, marked with coarse spiral ridges ; spire much 

 produced ; suture oblique ; outer lip thickened. Hants, B.C. 

 Near Birmingham (G. Sherriff Tye), near Wakefield (J. 

 Hebden), J.C. 



Var. 3. minor. Shell much smaller, thinner, and semi- 

 transparent, dark horn-colour, marked with stronger and closer 

 longitudinal striae. Mountainous tracts and sea-side marshes, 

 B.C. 



Var. 4. albida. Shell smaller, milk-white. Battersea (J. G. J.), 

 Crymlyn Burrows, Swansea (Moggridge), B.C. 



Var. 5. microstoma. Shell smaller and narrower; whorls 

 more swollen; mouth contracted. Southampton (J. G. J.), 

 B.C. 



Monst. scalar if or mis. Shell smaller; whorls nearly dis- 

 united. Warminster (J. G. J.), B.C. 



