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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Embryo Pig twothirds of an inch long from Parker Elements of Skull seen from below ch notochord iv parachordals au auditory capsule py pituitary body tr trabecula ctr trabecular cornu pn prenasal cartilage ppg palatopterygoid tract mn mandibular arch th first branchial arch VII XII cranial nerves