. The biology of the amphibia. Amphibians. 20 THE BIOLOGY OF THE AMPHIBIA. Fig. 9.—The development of Necturus maculosus. A. Side view of egg 1 day and 8 hours after deposition, showing second and third cleavage grooves. B. Bottom view of egg 6 days and 16 hours old. The crescentic blastopore lip sharply separates the large-yolk cells from the small cells of the blastodisc. C. Bottom view of egg 10 days and 10 hours old, showing large circular blastopore. D. Top view of egg 14 days and 4 hours old. Blastopore smaller. The beginning of neural fold formation, especially anteriorly. E. Top view o
. The biology of the amphibia. Amphibians. 20 THE BIOLOGY OF THE AMPHIBIA. Fig. 9.—The development of Necturus maculosus. A. Side view of egg 1 day and 8 hours after deposition, showing second and third cleavage grooves. B. Bottom view of egg 6 days and 16 hours old. The crescentic blastopore lip sharply separates the large-yolk cells from the small cells of the blastodisc. C. Bottom view of egg 10 days and 10 hours old, showing large circular blastopore. D. Top view of egg 14 days and 4 hours old. Blastopore smaller. The beginning of neural fold formation, especially anteriorly. E. Top view of egg 15 days and 15 hours old. Yolk plug still visible. Neural fold prominent. Its free ends reach nearly to the blastopore. F. Top view of egg 18 days and 15 hours old with three or four pairs of myotomes visible. G. Dorsolateral view of embryo 22 days and 17 hours old; length 8 mm.; 16 to 18 myotomes. H. Side. 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 Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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