100 EELICIDM. 



shelly matter between the two lips on the penult whorl 

 very thinly spread. A somewhat tubercular projection on 

 the inner edge of the outer lip, conjointly with a conspi- 

 cuous curved and remarkably prominent laminar parietal 

 tooth, which is united to the outer lip by a callus, almost 

 isolates a small portion of the aperture; there is a second, 

 but smaller and more deeply-seated parietal lamina, a 

 strong columellar one, a remote inferior palatal one, and 

 a basal denticle, which is very far within the aperture, 

 making in all five teeth. 



Length very nearly two lines ; breadth not quite half 

 that measurement. 



The animal is described by Mr. Alder (who has given 

 an interesting account of the internal structure of its shell 

 in his Memoir on the Land and Fresh-water shells of 

 Northumberland) as being of a dark lead colour above, 

 white below. 



This species, though usually regarded as more especially 

 belonging to the North of England districts, is probably a 

 member of our Atlantic fauna, and of southern or south- 

 western origin. Mr. F. D. Lukis finds it in great abun- 

 dance on the south coast of Guernsey ; and Mr. W. 

 Thompson records it as occurring in north, south, east, and 

 west of Ireland, though not general. The same active 

 naturalist has found it in the south-west of Scotland. The 

 naturalists of Newcastle have found it in several localities 

 in the Northumberland district, where it occurs in moss, 

 and under stones, but is scarce. It was first taken in the 

 neighbourhood of Scarborough, by Mr. J. S. Miller. 



