. Carnegie Institution of Washington publication. DETAILS OF EARLY EMBRYO. 83 faded awaj', and, pari passu, the yolk nuclei have greath' increased in number. In the re-ion where the yolk-entoderm approaches the lumen of the gut it thickens and sinks downward, leaving as the Hoor of the gut cavity a wedge-shaped mass of ger- minal yolk. At the outer rim of the yolk-entoderm we observe that it becomes con- tmuuus with the mesoblast; in other words, recalling sections d and g, the peristomial mesoblast of Chinicera which now arises is not continuous with the gastral mesoblast. We have thus a reas
. Carnegie Institution of Washington publication. DETAILS OF EARLY EMBRYO. 83 faded awaj', and, pari passu, the yolk nuclei have greath' increased in number. In the re-ion where the yolk-entoderm approaches the lumen of the gut it thickens and sinks downward, leaving as the Hoor of the gut cavity a wedge-shaped mass of ger- minal yolk. At the outer rim of the yolk-entoderm we observe that it becomes con- tmuuus with the mesoblast; in other words, recalling sections d and g, the peristomial mesoblast of Chinicera which now arises is not continuous with the gastral mesoblast. We have thus a reason for inquiring whether gastral and peristomial mesoblast. 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, Carnegie Institution of Washington
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