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Quarterly Journal of Microscopical Science, Vol s2-80, 285-291, Copyright © 1938 by Company of Biologists

Memoirs: A Quantitative Study of the Changes in the Cytosome of Eggs of the Echinodermata During Early Cleavage

D. PELLUET 1

1 Zoological Laboratory, Dalhousie University, Halifax, N.S., Canada

An estimate of the changes in volume, fat, and mitochondria occurring in the early cleavage stages of Arbacia has been made. The volume fluctuates with each successive cleavage, but it is probable that there is no significant change until after the gastrula stage has been reached.

The number of fat-granules decreases steadily from the unfertilized to the four-cell stage, with a slight increase in the blastula.

The mitochondria show a slight decrease between the unfertilized and fertilized condition and a marked decrease at the four-cell stage, followed by a sharp increase in the blastula.

A preliminary investigation of another Echinoderm, Asterias forbesi, suggests that it differs considerably from that of Arbacia.

It is a pleasure to acknowledge the assistance of Dr. F. R. Hayes in several ways, and especially for checking many of the calculations.






© The Company of Biologists Ltd 1938