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UNIVALVES. MUREX* 



MUREX.— Rock or Trumpet-Shell. 



Animal— a Limax : Shell univalve, spiral, rough, , with 

 membranaceous sutures; aperture oval, ending in an 

 entire, straight, or slightly ascending canal. 



The most prominent character which distinguishes the 

 one liundred and eighty-two species of this genus from 



