Org"ns, vital, [57]
Origin of alimentary canal, [444]
Ori"in of arthropods from annelids, [395]
Ori"in of atrial cavity, [409]
Ori"in of auditory capsules and parachordals, [377]
Ori"in of ductless glands, [428]
Ori"in of free cells, [472]
Ori"in of heart of vertebrate, [179]
Ori"in of lateral line organs, [356]