. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 268 Mr. G. A. Drew on the embryo, but never forms a distinct invagination. At most it is only slightly concave when viewed from above, and soon becomes arched outward. These changes are accompanied by the formation of the mid-gut, a term that is not intended Fig. 1.. External appearance of an embryo of forty-four hours. ac, apical ciUa ; bl, blastopore ; x, ventral depression. to include the ventral tube, which is of unknown origin. From the beginning it is connected with the

. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 268 Mr. G. A. Drew on the embryo, but never forms a distinct invagination. At most it is only slightly concave when viewed from above, and soon becomes arched outward. These changes are accompanied by the formation of the mid-gut, a term that is not intended Fig. 1.. External appearance of an embryo of forty-four hours. ac, apical ciUa ; bl, blastopore ; x, ventral depression. to include the ventral tube, which is of unknown origin. From the beginning it is connected with the  Stock Photo
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Library Book Collection / Alamy Stock Photo

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RMR261

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7.2 MB (304.1 KB Compressed download)

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987 x 2533 px | 8.4 x 21.4 cm | 3.3 x 8.4 inches | 300dpi

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. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 268 Mr. G. A. Drew on the embryo, but never forms a distinct invagination. At most it is only slightly concave when viewed from above, and soon becomes arched outward. These changes are accompanied by the formation of the mid-gut, a term that is not intended Fig. 1.. External appearance of an embryo of forty-four hours. ac, apical ciUa ; bl, blastopore ; x, ventral depression. to include the ventral tube, which is of unknown origin. From the beginning it is connected with the ventral tube, formed, as it were, as a continuation of the anterior extremity of the ventral tube.. 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 work.. London, Taylor and Francis, Ltd

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