404 



the aperture extends full one half; breadth two-tenths 

 of an inch. 



A variety is irregularly flreaked, or blotched with ru- 

 fous, or white, on the upper part of the larger volution, 

 but the fmooth part of the pillar lip, and inlide, are in- 

 variably of the iiinie dark-purple colour. 



Thisfpecies, -which at prefent appears to be a nonde- 

 fcript, may poflTibly have been confounded for the fry of 

 fome of the larger littoral (hells ; though, on clofe exami- 

 nation, will be found to be eUentially different from any 

 Britijh fpecies, hitherto noticed ; the mouth, alone, be- 

 ing a ftrong fpecific mark of diflinftion ; and if atten- 

 tively examined, will always prove an unerring guide. 



We have, ns yet, only met with it on the fouth coad. 

 of Devon, near the mouth of the river Aun, not far from 

 the village of Bantum, adhering to the rocks, a little 

 beneath high water-mark; and there in noinconfiderable 

 abundance : and lefs plentiful in a fimilar fituation at 

 Stoanage in DorfetJJiire. 



Upon a curfory view, it may be miflaken for Turbo 

 tcnebrofus, being nearly the fame fize, and colour; the 

 fiiape, however, is not only very different, but the fmal- 

 lefl attention to the aperture, and a comparifon of the 

 defcription of each, will prevent their being confounded. 



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