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Webster's 1913 Dictionary

PROSOBRANCHIATA

Pros `o *bran `chi *a "ta, n. pl. Etym: [NL. , fr. Gr. (Zoöl.)

 

Defn: The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate.