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Webster's 1913 Dictionary

SIPHONOBRANCHIATA

Si `pho *no *bran `chi *a "ta, n. pl. Etym: [NL. See Siphon, and Branchia. ](Zoöl.)

 

Defn: 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.