. Text-book of embryology. Embryology. 182 INVEETEBEATA CHAP. cells; but between the cephalic lobes there is still a groove of flattened indifferent cells. As a result of these changes we have now a heart- shaped, coherent, ventral plate of columnar cells. In the next stage the blastopore changes from a circular to Fio. 130. — Sagittal section through a portion of the em- bryo of Astacus iluviatilis to show the invagination of the endodermie rudiment. (After Reichenbach.) eiidf endoderra, the two 'Cferences to end mark t,he anterior and posterior limits of the endodermie jilate ; mes, "pr
. Text-book of embryology. Embryology. 182 INVEETEBEATA CHAP. cells; but between the cephalic lobes there is still a groove of flattened indifferent cells. As a result of these changes we have now a heart- shaped, coherent, ventral plate of columnar cells. In the next stage the blastopore changes from a circular to Fio. 130. — Sagittal section through a portion of the em- bryo of Astacus iluviatilis to show the invagination of the endodermie rudiment. (After Reichenbach.) eiidf endoderra, the two 'Cferences to end mark t,he anterior and posterior limits of the endodermie jilate ; mes, "primary" mesoderm ; mesi, second- ary mesoderm. an elliptical shape, with its long axis coincident with the long axis of the embryo. The thoracico-abdominal rudiments become thoroughly united with one another in the middle line, and become arched upwards so as to project over the open blastopore and partially conceal it from view. Simultaneously the blastopore begins to close. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
