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the fliores of the Frith of Forth, nearly oppofite to Edinburgh ; 

 an afTertion founded on oral, not ocular demonftration. To 

 this enquiry however we dire6led our attention, and after a 

 ftri6l fearch for more than two years on that coaft, by two 

 able conchologifts, no fuch fliell was found, although that 

 with the three dorfal fpots deftitute of the fulcus, as well as 

 C. arctica or plain variety were obferved to be common, as 

 well oppofite to Edinburgh, as on moft parts of the fliores 

 of the Frith of Forth* Under thefe circumftances we do 

 not only continue to doubt the exiflence of the fulcated fpe- 

 cies as Briti/Ij, but even as European; at any rate we have no 

 hefitation in declaring it as our opinion that they are perfe6lly 

 diftin6l, and have therefore, under the flrongeft convJ<51:ion, 

 been induced to feparate the European fpecies from the Occi' 

 dental, under the title prefixed. 



We cannot too often repeat that great care and attention 

 are required in afcertaining what fpecies are really Britijh, 

 for confufion becomes inevitable when once they have been 

 admitted into foreign colle(^lions, or have been accidentally 

 mixed with exotic fpecimens by friends who, wifliing to 

 oblige, have amaflfed every thing they could colledt from 

 others, without perfonal knowledge. 



• Mr. H.BoYS and Mr, Laskey, two gentlemen whose golden harvest in the' 

 field of Northern conchology has not only been amply experienced by the author, 

 but fully demonstrated to the public in these sheet's. 



If 



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