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Prosobranchiata
CIDE DICTIONARY
Prosobranchiata, n. pl. [NL., fr. Gr. forward, further + a gill.].
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. [1913 Webster]
For further exploring for "Prosobranchiata" in Webster Dictionary Online