. Contributions to embryology. Embryology. Figs. 5 and 6. Two specimens of the atlas in which there is incomplete dorsal arch formation. Fig. 5, specimen Xo. 25S637 F2, U. S. National Museum. Fig. 6, specimen No. 262993, U. S. National Museum. Fig. 7. Specimen showing of the dorsal laminse. Specimen No. 256457, U. S. National Museum. Fig. 8. Specimen showing asymmetry of the dorsal laminje. Specimen No. 271782, U. S. National Museum. Fio. 9. Posterior view of the cerv'ical vertebRe, of wliich the fifth lacks dorsal laminae. Specimen No. 227471, U. S. Nat. Mus. Fig. 10. Specimen showi
. Contributions to embryology. Embryology. Figs. 5 and 6. Two specimens of the atlas in which there is incomplete dorsal arch formation. Fig. 5, specimen Xo. 25S637 F2, U. S. National Museum. Fig. 6, specimen No. 262993, U. S. National Museum. Fig. 7. Specimen showing of the dorsal laminse. Specimen No. 256457, U. S. National Museum. Fig. 8. Specimen showing asymmetry of the dorsal laminje. Specimen No. 271782, U. S. National Museum. Fio. 9. Posterior view of the cerv'ical vertebRe, of wliich the fifth lacks dorsal laminae. Specimen No. 227471, U. S. Nat. Mus. Fig. 10. Specimen showing open Siicral canal and partial sacralization of fifth lumbar vertebra, the dorsal arch of which is bifid. X Specimen No. 17980506, U. S. National Museiuu. Fig. 11. Specimen showing fusion of atlas and occiput, the posterior arch of the atlas being 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 Carnegie Institution of Washington. Washington, D. C
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