Source : Webster's Revised Unabridged Dictionary (1913)

Vermetus \Ver*me"tus\, n. [NL., from L. vermis worm.] (Zo["o]l.)
   Any one of many species of marine gastropods belonging to
   {Vermetus} and allied genera, of the family {Vermetid[ae]}.
   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.