Source : Webster's Revised Unabridged Dictionary (1913)

Nerita \Ne*ri"ta\, n. [L., a sort of sea mussel, gr. ?, ?.]
   (Zo["o]l.)
   A genus of marine gastropods, mostly natives of warm
   climates.

Source : WordNet®

nerita
     n : having short a smooth or spirally ridged shell with thick
         usually toothed outer lip and toothed operculum