The embryology and metamorphosis of the Macroura . S SAULCYI. S. Mifi. n4 3o 546 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. Plate XLII. (Stage VI.) Figs. 119-122. Serial transverse sections of the egg-nauplius, continued from PI. xli. In Fig,120 a transverse row of cells with large clear nuclei is seen. This is probably aseries of budding ectoblasts and mesoblasts, already referred to. Wandering cellsappear to be settling down upon all parts of the embryo. In the thoracico-abdomi-nal fold (Fig. 122, tom.) the abdominal muscles are already nndergoing differentiationout of the mesoblast of the
The embryology and metamorphosis of the Macroura . S SAULCYI. S. Mifi. n4 3o 546 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. Plate XLII. (Stage VI.) Figs. 119-122. Serial transverse sections of the egg-nauplius, continued from PI. xli. In Fig,120 a transverse row of cells with large clear nuclei is seen. This is probably aseries of budding ectoblasts and mesoblasts, already referred to. Wandering cellsappear to be settling down upon all parts of the embryo. In the thoracico-abdomi-nal fold (Fig. 122, tom.) the abdominal muscles are already nndergoing differentiationout of the mesoblast of the ventral plate. x295. REFERENCE LETTERS. A., ; {II), antennal , alKlomeu. A. T. S., yolk umlergoing , budding zone.\ lict., ectoderm. /TV/., , (1., mandibular , F., median , muscle (1), first maxillary , products of cell ;S. C, degenerating , yolk. T. C, T. C, wandering , vacuole. MxiU XUI o Vac O 0D« ^o (X^^c,....^^^^
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