THE EARLY DEVELOPMENT OF ASCIDIAN EGGS

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Abstract
Observations were made on living, nude eggs, unstained and vitally stained, of Ascidiella aspersa and Phallusia mammillata. The so-called "polar pit" apparently has no constant relation to the site of polar-body extrusion. The egg undergoes very marked changes in shape from just before the extrusion of the first polar Body until the first cleavage. In tadpoles developing from eggs stained with neutral red, the stain becomes confined to the endoderm and notochord.

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