SIPHONOBRANCHIATA

‖Si′pho‐no‐bran′chi‐a″ta (?), n. pl. [[NL. See Siphon, and Branchia.]] (Zoöl.) A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group.