196 LAND AND FRESH-WATER MOLLUSKS. - 
composed of seven or eight rounded whorls, thin 
and glossy, but with a few faint longitudinal 
striations. The aperture is narrowed above, not 
a third of the length of the shell, with a thick 
broad white rib inside ; length of shell one inch 
It is the rarest species of the genus, and is 
found in ditches and shallow pools in some of the 
eastern and south-western counties ; in marshes 
on the coast near Swansea ; in Yorkshire, Durham, 
and Staffordshire ; at Bowness, Westmoreland; in 
Treland, Cork. It ranges into North and Central 
Europe. 
Limyaa (AMPHIPEPLEA) GLUTINOSA—(the Glutin- 
ous Membrane Shell) (Pl. X., figs. 121, 122).— 
L. glutinosa differs from the species of the genus 
by the disposition of its mantle, which entirely 
covers the shell when the animal is submerged, 
and then resembles a ball of mucilage. It is this 
character which induced Nilsson to found a new 
genus, Amphipeplea, of it. 
The shell of this beautiful and interesting 
mollusk is semi-globular, thin, transparent, and 
glossy amber-coloured; the spire is very short, 
of three scarcely-produced whorls; the length is 
about half-an-inch, and nearly as much wide. 
When the shell remains in the water after the 
death of the animal, it soon loses its transparency 
and beautiful amber colour. 
The animal of L. glutinosa is large, glossy, 
