n. plHolostomata(Zoöl) An artificial division of gastropods, including those that have an entire aperture.
Century Dictionary and Cyclopedia
holostomataA division of pectinibranchiate gastropodous mollusks, with shells having the mouth entire, and not notched or prolonged into a siphon: opposed to Siphonostomata. It was framed to include such families as Turbinidæ, Neritidæ, Littorinidæ, etc., now referred to different orders. Some are known as sea-snails. There are upward of 12 families, even after eliminating some, as the chitons and tooth-shells, that used to be included. These families are mostly tænioglossate, but some, as the Ianthinidæ and Scalariidæ, are ptenoglossate.