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extraneous matter with which it is covered, particularly 

 Ralani, audi Serpulce ; efpecially S. granulata, and >Se- 

 nijlrorfa: the (hapeis oval, flat, ftriated longitudinally, 

 and wrinkled iranfverfely : near the inner margin is a 

 ridge the whole length of the fhell, which terminates in 

 one fpiral turn at the end, a little produced; this ridge 

 is befet with tubercles, which increafe in fize as they re- 

 cede from the apex, and become flat or concave; the 

 lafl: fix, and fometimes as many as nine, are pervious : 

 below the ridge is a depreflion or furrow ; behind which 

 the margin is rounded, and turns inward ; the front mar- 

 gin is thin. The infide is entirely open, concave, and 

 of a beautiful mother of pearl : the inflefled edge forms 

 a flat rim on the interior fide, quite up to the fpire, and 

 is nacred like the infide. Length from three to four 

 inches; breadth from two and a quarter to three inches. 



This fpecies probably inhabits thedeep, as we have 

 not been able to learn that it has ever been taken alive 

 on our coalts; though it is fometimes thrown upon our 

 fhores after violent fl:orms, in SuJJex, Dorfeijliire, and 

 DevonPiire. In Guernfey it is found in great plenty, 

 adherins[ to the rocks at the lowefl; ebb ; the animal ufed 

 for culinary purpofes, and the fliells adorn the houfes 

 of fome of the common,, people, being fludded in the 

 plaller on the outfide. 



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