01 n. pl. A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides…
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1.
A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia.(Zool.) See: Ceratobranchia