WAperture (mollusc)
WCircumesophageal nerve ring
WMollusc eye
WGirdle (chiton)
WGlochidium
WHepatopancreas
WHyaline shield
WHypoathroid
WMantle (mollusc)
WMicromollusk
WPenis
WMollusc shell
WNacre
WOdontophore
WPallial line
WPallial sinus
WSclerite
WSea silk
WStatocyst