64 IIELlClDvE. 



Shell orbicular, depressed on both sides, tolerably strong, 

 more or less glossy, umber-brown, not variegated, a little 

 opaque, somewhat wrinkled (especially above), obscurely 

 hispid, more evidently so below than above ; neither 

 keeled nor much rounded at the circumference, but a 

 little subangulated above. Spire concave ; apex depressed. 

 Whorls six, narrow, rounded, deeply defined, very slowly 

 enlarging ; the penult rather prominent ; the last but little 

 deflected, scarcely at all dilated, constricted towards the 

 mouth, where by its abrupt indentation rather above the 

 middle it forms a somewhat toothlike projection upon the 

 inner margin of the outer lip. Aperture somewhat tri- 

 gonal or foot-shaped, nearly as high as it is broad, not 

 equal in width to half the total diameter of the shell. 

 Peristome reflected, often rather broadly so, paler than 

 the general tint, and frequently of a pinkish hue inside ; 

 basal edge straightish, lateral edge not arcuated. Umbi- 

 licus very large, but much contracted by the penult 

 whorl. 



Diameter about five lines ; height only two. 



The animal is dusky, the head and neck nearly black, 

 the foot pale. 



This curious snail is very rare in Britain ; abundant in 

 the more hilly parts of central Europe. Hitherto it has 

 been found only among moss at the roots of trees in 

 Ditcham Wood, near Brenton, Hants, and for some 

 distance on the northern side of the chalk escarpment 

 of the South Downs. Its presence in Britain is ques- 

 tionably indigenous. 



