From The Collaborative International Dictionary of English v.0.48:

Vermetus \Ver*me"tus\, n. [NL., from L. vermis worm.] (Zool.)
   Any one of many species of marine gastropods belonging to
   Vermetus and allied genera, of the family Vermetidae.
   Their shells are regularly spiral when young, but later in
   life the whorls become separate, and the shell is often
   irregularly bent and contorted like a worm tube.
   [1913 Webster]
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