. The embryology and metamorphosis of the Macroura. Crustacea; Embryology -- Crustacea. 438 MEMOIRS OP THE NATIONAL ACADEMY OF SCIENCES. percentage ot increase of wandering cells between Stages n and in is double that of the embry- onic cells. Between Stages m and iv the increase per cent of wandering cells is less than that of embryonic cells, and up to this time cell disintegration is ruled out as a disturbiu- factor. aiv Fii;. 11, uinl fur details, see Table The second fact which was pointed out as characteristic of this stage, the distribution of the yolk nuclei commensurate with that of t
. The embryology and metamorphosis of the Macroura. Crustacea; Embryology -- Crustacea. 438 MEMOIRS OP THE NATIONAL ACADEMY OF SCIENCES. percentage ot increase of wandering cells between Stages n and in is double that of the embry- onic cells. Between Stages m and iv the increase per cent of wandering cells is less than that of embryonic cells, and up to this time cell disintegration is ruled out as a disturbiu- factor. aiv Fii;. 11, uinl fur details, see Table The second fact which was pointed out as characteristic of this stage, the distribution of the yolk nuclei commensurate with that of the yolk itself, also points to the conclusion already r^hcd This is well shown by two curves (Figs. 12, 13). In curve 13, which is constructed from a series ... , b 6: F,,, abowins tl,«. dlriritatfcn ,,f wan,lerin!t cells in Stage v, a. (v. Table ,., A, Anterior; P. Posierior. old reon * abundant in the thoracic-abdomiual. fold egion and in hat which answers to the future heart. We also notice the forward extension o he fuHry CellS.'ey°m ^ anttrior ed*e of the oP«e ^bes. In cut 12 the lateral extension the nuclei on side the embijo is well shown. The mouth is involved in section No 28. 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 Brooks, William Keith, 1848-1908; National Academy of Sciences (U. S. ); Herrick, Francis Hobart, 1858-1940. [Washington : National Academy of Sciences : Government Printing Office
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