gastrocystis

* (* The blastula of the lower animals must not be confused with the very different blastula of the mammal, which is properly called the gastrocystis or blastocystis.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

For these reasons it is very necessary to recognise the secondary embryonic vesicle in the mammal (gastrocystis or blastocystis) as a characteristic structure peculiar to this class, and distinguish it carefully from the primary blastula of the amphioxus and the invertebrates.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

The visceral embryonic vesicle (blastocystis or gastrocystis) of a rabbit (the "blastula" or vesicula blastodermica of other writers), a outer envelope (ovolemma), b skin-layer or ectoderm, forming the entire wall of the yelk-vesicle, c groups of dark cells, representing the visceral layer or entoderm.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

This cenogenetic gastrocystis and the palingenetic blastula are sometimes very wrongly comprised under the common name of blastula or vesicula blastodermica.)

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876