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Plate 1

Fig. 1. Photograph of the dorsal aspect of a reconstruction model of the embryonal disc (x 75). The amniotic sac has been removed and the allantois dissected out of the body stalk, while the differentportionsoftheaxialformationsareportrayedonthesurface. P.S.primitivestreak. N.C.neurentericcanal. C.P. chorda plate. P.R.prochordal plate.

Fig. 2. A section (x 250) through the primitive streak. It shows the activity of the entoderm whichatX may be contributing to the mesoderm.

Fig. 3. A section (x250) through the neurenteric canal, N.C. C.P. indicates the commencement of the chordplate. Y.S. yolk sac.

Fig. 4. A typical section (x250) of the chordaplate,C.P.

Fig. 5. A section (x370) showing a mass of cels at X contiguous ventrally with the dorsal surface of the chord plate and dorsally with the ectoderm.

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