The Cassis madagascariensis (forma or subspecies spinella) fragments that
you find are  washed in from just offshore.  It lives in the Gulf Stream and
for some distance landward from the Steam but I don't know exactly how far.
Dead shells were often brought up by shrimpers when I frequented the shrimp
boat docks years ago.  It may be a good species as I have never seen the
typical form from this area.

dick p.

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