fulgur carica

from The Collaborative International Dictionary of English v.0.48

Periwinkle \Per"i*win`kle\, n. [From AS. pinewincla a shellfish,
   in which pine- is fr. L. pina, pinna, a kind of mussel, akin
   to Gr. ?. Cf. {Winkle}.] (Zool.)
   Any small marine gastropod shell of the genus {Littorina}.
   The common European species ({Littorina littorea}), in Europe
   extensively used as food, has recently become naturalized
   abundantly on the American coast. See {Littorina}.
   [1913 Webster]

   Note: In America the name is often applied to several large
         univalves, as {Fulgur carica}, and {Fulgur
         canaliculata}.
         [1913 Webster]