Meaning of OPISTHOBRANCHIA

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WordNet Dictionary
	Definition:		[n]  gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
	Synonyms:		subclass Opisthobranchia
	See Also:		class, class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda, Nudibranchia, order Nudibranchia
Webster's 1913 Dictionary
	Definition:		\O*pis`tho*bran"chi*a\, Opisthobranchiata