434 



41, 

 Umbilicata. H. with a lub-pellucid, dark, horn-coloured fiiell. 



Tab. 13. f. 2. inchning to chocolate : volutions five, much rounded, 

 divided by a deep feparating line, and finely ftriated 

 acrofs the whirls : (7/?<?,?c moderately produced: aperture 

 lunated ; lip attenuated, not reflefted ; vjnHliciis ex- 

 tremely large and deep for the fize of the fliell, the fpires 

 vifible to the end. Diameter at the bafe one tenth of 

 an inch ; height not quite fo much. 



This fpecies has much the habit of the preceding, and 

 might readily be confounded for the young of it, was it 

 not always of a uniform dark colour: upon nice infpec- 

 tion too, it will be found to be not fo flat, the volutions- 

 much more raifed, and flrongly divided, and the ftrire , 

 lefs confpicuous. 



We firfl: difcovered this fhell on loofe built walls, that 

 enclofe the fields about Tenby in Caermarthenjliirc, in vafl 

 profufion, lurking under the upper flones ; and at firft 

 fight took them to be the young of the //. radiata, but 

 by the afliftance of a lens was foon convinced to the con- 

 trary ; befides, not a fingle radtata was to be found in 

 that neighbourhood. They feem to be confined to the 

 north fide of that town, and were not to be met with 

 elfe-where : nor were we able to difcover it in any other 

 part of England, till about ten yeafs after; when we 

 found it in confiderable abundance under loofe ftones, 

 on the fummit of the hill, in Portland ifiand, and on the 



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