Locally common under stones in shallow water.  The shell is inflated and pear-shaped,  with a rounded base and rounded marginal callous.  Small black spots extend more tha halfway onto the dorsum.  Attains 1.5 inches.  Central Baja California to the Galapagos and north Peru. 

Several dead specimens were found on north Maui, which is the second Panamic gastropod recorded in Hawaii, pending confirmation of a living specimen.  A handful of Eastern Pacific reef fish species have arrived via currents due to El Nino.