. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. V] EARLY DEYELOPMEXT OF THE EMBRYO 59 sides have met iu front of the medullary folds. The gill-plate is also seen, but the outer medullary folds are no longer con- spicuous. The inner medullary folds are closing in to form a tube. The blastopore is reduced to an elongated slit-like opening, A still later stage is drawn in Fig. 20, E. The outline of the whole egg is now elliptical, with the long axis in the direc- tion of the long axis of the embryo. The medullary folds are also much longer, and hav
. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. V] EARLY DEYELOPMEXT OF THE EMBRYO 59 sides have met iu front of the medullary folds. The gill-plate is also seen, but the outer medullary folds are no longer con- spicuous. The inner medullary folds are closing in to form a tube. The blastopore is reduced to an elongated slit-like opening, A still later stage is drawn in Fig. 20, E. The outline of the whole egg is now elliptical, with the long axis in the direc- tion of the long axis of the embryo. The medullary folds are also much longer, and have approached* each other in the middle line. A deep furrow lies between the two halves. 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 Morgan, Thomas Hunt, 1866-1945. New York, The Macmillan company; [etc. , etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectembryology, bookyear1
