. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 423 notochord, and rapidly spread in all directions, but particularly towards the surface, leaving cartilaginous ends (Fig. 241). The notochord is gradually reduced and exhibits two constrictions. Fig. 240. — The first cervical vertebrae of a young embryo of Haliplana fuliginosa. (After Schauins- land.) 1,2, First and second subnotochordal bars. R. 3, 4, 5, 6, Ribs of the third, fourth, fifth, and sixth cervical vertebrae. and three enlargements within each centrum. The main en- largement oc
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 423 notochord, and rapidly spread in all directions, but particularly towards the surface, leaving cartilaginous ends (Fig. 241). The notochord is gradually reduced and exhibits two constrictions. Fig. 240. — The first cervical vertebrae of a young embryo of Haliplana fuliginosa. (After Schauins- land.) 1,2, First and second subnotochordal bars. R. 3, 4, 5, 6, Ribs of the third, fourth, fifth, and sixth cervical vertebrae. and three enlargements within each centrum. The main en- largement occupies the center and the two smaller swellings the cartilaginous ends, the constriction occurring at the junction of the ossified areas and cartilaginous ends (Fig. 241).. 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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