587 



fourths of the fliell : apex not much elevated, but mode- 

 rately pointed: aperture fub-orbicular ; outer lip thin, 

 fub-crenated by the ridges ; pillar lip broad and fmooth, 

 imperforated. 



Diameter about three-eighths of an inch, ufually as 

 broad as it is high. 



Wereceived a fliell of this defcription from a concho- 

 logical friend, for the T. obtufatus of Linnaeus ; it was 

 of a dull orange-yellow colour, and was taken on the 

 coad o^ Dorfet. 



\j 



Mr. GiBBS, \vho has recently taken at our defire, a 

 tour of refearch nnthecoafl ol Cor mo all, brought feve- 

 ral of thefe (hells from the rocks at low water mark, 



near Si. Ives. 



Thefe agree in every refpeft with that from Dorfetjldrc, 

 except in colour; fome are dark- purple, with the ridges 

 white; others greenifh on the outfide, the infide dark 

 purplifli-brown, or chocolate-colour: on the body are 

 ten or eleven, much elevated, fliarp ridges, reflecting a 

 little upwards: on the fecond volution are three or four, 

 and fometimes the fame on the third, but more common- 

 ly worn fmooth. 



Amongft the varietv of littoral fl^ells that have puz- 

 zled the mofl: able teflaceologifls, and which m the com- 



F f f f 2 mon 



