The embryology and metamorphosis of the Macroura . Fig. 93. red. -a-- ^ c:^. ;TH^JHt^l*» 538 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. Plate XXXVIII. (Stage VI.) Figs. 9(5-97. Longitudinal sections through the embryo shown in. Fig. The more lateral of thetwo, Fig. 96, cuts the middle of the optic disk, and shows the large cells of the prolif-erating area, one of which is caught in the act of dividing. Fig. 97 cuts the innerportion of the optic disk and the ventral plate on a level with the budding mandible(Md,). x295. Figs. Longitudinal serial sections through an embry

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The embryology and metamorphosis of the Macroura . Fig. 93. red. -a-- ^ c:^. ;TH^JHt^l*» 538 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. Plate XXXVIII. (Stage VI.) Figs. 9(5-97. Longitudinal sections through the embryo shown in. Fig. The more lateral of thetwo, Fig. 96, cuts the middle of the optic disk, and shows the large cells of the prolif-erating area, one of which is caught in the act of dividing. Fig. 97 cuts the innerportion of the optic disk and the ventral plate on a level with the budding mandible(Md,). x295. Figs. Longitudinal serial sections through an embryo six hours older, from the samebatch of eggs. The mouth (Fig. 98, Std.) has already appeared. The mesoblast,formed chiefly from wandering cells, is well established on either side of the middleline of the body, and is well seen under the folds of the appendages (Fig. 100, Mes.)into which it extends. The mesoblast represented by the lower layers of the ventralplate is still being increased by the migration of cells from the surf

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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectcrustacea