RHACHIGLOSSA n.
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.
TOXOGLOSSA n.
A division of marine gastropod mollusks in which the radula are converted into poison fangs. The cone shells (Conus), Pleurotoma, and Terebra, are examples. See Illust. of Cone, n., 4, Pleurotoma, and Terebra.