. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 179 floor of the laiyngotracheal groove directl}^ continuous with the floor of the branchial portion of the pharynx at its hind end; the former bends up at about right angles to enter the narrow oesophagus (Figs. 87 and 88). Thus the whole pulmonary tract communicates widely with the pharynx at the 35 s stage. Its complete delimination falls within the period covered by Chapter X. The continuity of the expansions that form the lung primordia, w^ith the series of visceral pouche

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. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 179 floor of the laiyngotracheal groove directl}^ continuous with the floor of the branchial portion of the pharynx at its hind end; the former bends up at about right angles to enter the narrow oesophagus (Figs. 87 and 88). Thus the whole pulmonary tract communicates widely with the pharynx at the 35 s stage. Its complete delimination falls within the period covered by Chapter X. The continuity of the expansions that form the lung primordia, w^ith the series of visceral pouches as shown in Fig. 100, is especially noteworthy as suggesting a theory of the phylogenetic derivation of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York, Holt

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