AZECA. 129 



ation to a rounded extremity. Mouth remarkably small, 

 usually filling only an eighth of the ventral surface, not at 

 all projecting, hut leaning rather to the left, obliquely sub- 

 trigonal pear-shaped. Peristome rendered entire by a 

 pale callous rim (that is raised at its edge, excepting at 

 the slightly sinuated upper end of the outer lip), armed 

 internally with a moderate-sized tooth in the middle of 

 the outer lip, a solid blunt one at the anterior end of 

 the pillar, and a projecting lamella or laterally pinched 

 tooth on the parietal portion of the inner lip (just above 

 and sloping towards the opposite labral one) ; two den- 

 ticles are also for the most part present, one immediately 

 over the lamella, the other half way between it and the 

 columellar tooth. No umbilical crevice. Length, a 

 quarter of an inch ; breadth, a little more than a third 

 of the length. In a variety there is a strong additional 

 tooth in the throat beneath the labral one, and one or 

 two more palatal teeth are sometimes visible. 



The animal is very dark in colour, nearly black above, 

 and resembles closely that of Zua luhrica. 



This pretty shell, though scarce and local, is, neverthe- 

 less, widely distributed in England, ranging from the 

 southern counties to Northumberland, and occurring, for 

 the most part, in wooded districts, where it is found 

 among moss. It lives in company with the preceding 

 sjiecies, but is found much more sparingly. Where it 

 occurs, it is quite as plentiful in the north as in the south, 

 but appears to be rare in the south-west. It is probably 

 most abundant in the northern English counties, whence 

 it may extend into the southernmost Scotch counties, but 

 soon reaches its limits. It does not occur in the Isle of 

 Man nor in Ireland. 



It is widely distributed on the Continent. 



VOL. IV. s 



