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We may call it the Blastaea. Its body consisted, when fully formed, of a simple hollow ball, filled with fluid or structureless jelly, with a wall composed of a single stratum of ciliated cells. There were probably many genera and species of these blastaeads in the Laurentian period, forming a special class of marine protists.
Ernst Heinrich Philipp August Haeckel - The Evolution of Man — Volume 2

There are "blastaeads" of this kind even among the Protophyta the familiar Volvocina, formerly classed with the infusoria. The common Volvox globator is found in the ponds in the spring a small, green, gelatinous globule, swimming about by means of the stroke of its lashes, which rise in pairs from the cells on its surface.
Ernst Heinrich Philipp August Haeckel - The Evolution of Man — Volume 2
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1773-1774

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