. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 7. Introduced to show the relation of the first and second clefts to the rest of the embryo. /, anterior end of the primitive streak ; b-p, region of differentiation of the embryo. X. it ~ h Fig. 8. Enlarged portion of the opposite side of the embryo represented in Fig. 7. s, shallow depression. X 247- Figs. 6-8. In these, as in the remaining figures of this paper, A is anterior and B posterior end, and a, b, c, etc., are respectively the first, second, third, etc., clefts. most critical study made on sections is by Miss Piatt,
. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 7. Introduced to show the relation of the first and second clefts to the rest of the embryo. /, anterior end of the primitive streak ; b-p, region of differentiation of the embryo. X. it ~ h Fig. 8. Enlarged portion of the opposite side of the embryo represented in Fig. 7. s, shallow depression. X 247- Figs. 6-8. In these, as in the remaining figures of this paper, A is anterior and B posterior end, and a, b, c, etc., are respectively the first, second, third, etc., clefts. most critical study made on sections is by Miss Piatt, whose view is well summed up in her conclusion, in which she says : " My conclusions are, therefore, that the first break in the mesoderm occurs anterior to the first protovertebra, and that two protover- tebrse (or,, more correctly, one and a half) are slowly formed. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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