Cohen and Berrill (1936) have given an interesting account of observations on eggs of Ascidiella aspcrsa and Phallusia rnainillata.After the jelly was digested by the gastric juice of the crab Munida, the eggs were stained in toto with a vital dye (particularly Nile-blue sulfate) and subsequent events studied with special reference to changes in the form of the germ and in the appearance of the vital dye within the egg.
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