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Journal of Experimental Biology 35,396-399 (1958)
Published by Company of Biologists 1958

Surface Characters of Dividing Cells : I. Stationary Surface Rings

SHOZO ISHIZAKA ¹

¹ Biological Department, Tokyo Metropolitan University

1. The surface movements during division have been studied by marking the naked surface of the sea-urchin egg with charcoal particles.

2. The contours of the largest optical section, the positions of the particles thereon and the positions of the astral centres are recorded in a series of camera lucida drawings.

3. The drawings are then superimposed, the centre of gravity and spindle axis being used for reference.

4. It is thereby shown that there are two surface rings which remain in the same positions throughout the whole process of division.

5. It is concluded that these rings indicate regions where stresses remain balanced during division.