Keywords: Origin of Vertebrates Fig 048.png Fig 48 ”Embryo Pig two-thirds 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 pre-nasal cartilage; ppg palato-pterygoid tract; mn mandibular arch; th h first branchial arch; VII -XII cranial nerves 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Sus scrofa skulls |