. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 132 FLORENCE MARIE SCOTT It may be helpful before presenting the process of gastrulation to clarify the terms used in describing it. The blastopore is the margin of cells surrounding the macromeres. Its anterior border consists, at first, of chorda-neural cells and later of neural cells only. It is consistently called the anterior lip (the "dorsal lip" of embryologists dealing with Amphibian forms). Its posterior border ("ven- tral lip") is the crescent of presumptive mesodermal cells and is called the po
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 132 FLORENCE MARIE SCOTT It may be helpful before presenting the process of gastrulation to clarify the terms used in describing it. The blastopore is the margin of cells surrounding the macromeres. Its anterior border consists, at first, of chorda-neural cells and later of neural cells only. It is consistently called the anterior lip (the "dorsal lip" of embryologists dealing with Amphibian forms). Its posterior border ("ven- tral lip") is the crescent of presumptive mesodermal cells and is called the posterior lip. Lateral regions are referred to as right and left lips respectively. In Styela, which provides the pattern to be used as a basis for comparison, movements of cells in gastrulation are not modified by accumulation of yolk. The. A. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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