varieties; particularly the Ammiralis fummus, A. oc- 
cidentalis, and above all the fuperb variety, if not 
diftinct fpecies, known by the title of Cedo nulli, of 
_ which a fpecimen has been fometimes valued at the 
price of an hundred guineas. The prefent fpecies, 
though not comparable either in point of beauty or 
rarity to many others, is yet poffeffed of a very high 
degree of elegance. It is a native of the American 
ocean. 3 
It fhould be obferved that this genus, before the 
Syftema Nature of Linnzus made its appearance, 
was diftinguifhed by the name of Voluta or Volute ; 
but Linnzus, with greater propriety, has applied 
the title of Conus; the outline of the fhell, in moft 
fpecies, approaching very nearly to the mathemati- 
cal figure of a cone. 
