( n. pl. )
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.
( n. pl. )
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.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012