serolemma

The spots on the outer wall of the serolemma are the roots of the branching chorion-villi, which are free at the border.

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

On the other hand, this is certainly not the case with the following embryonic forms, which we must describe as cenogenetic processes: the formation of the yelk-sac, the allantois, the placenta, the amnion, the serolemma, and the chorion -- or, generally speaking, the various foetal membranes and the corresponding changes in the blood vessels.

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

This is formed from the external layer of the amnion, the serolemma, or "serous membrane," the formation of which we shall consider presently; it surrounds the foetus and its appendages as a broad, completely closed sac; the space between the two, filled with clear watery fluid, is the serocoelom, or interamniotic cavity

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

But in the third sub-class of the mammals the serolemma forms, by invagination at its outer surface, a number of hollow tufts or villi, from which it takes the name of the chorion or mallochorion.

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

The wall of the allantois and the enveloping serolemma remains smooth and without villi, as in the birds.

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

AC amniotic cavity, UV yelk-sac or umbilical vesicle, ALC allantois, al pericoelom or serocoelom (inter-amniotic cavity), sz serolemma (or serous membrane), pc prochorion (with villi).)

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