Source : Webster's Revised Unabridged Dictionary (1913)

Rhachiglossa \Rhach`i*glos"sa\, n.pl. [NL. See {Rhachis}, and
   {Glossa}.] (Zo["o]l.)
   A division of marine gastropods having a retractile proboscis
   and three longitudinal rows of teeth on the radula. It
   includes many of the large ornamental shells, as the miters,
   murices, olives, purpuras, volutes, and whelks. See Illust.
   in Append.