ovolemma

The globular mass of yelk (b) is enclosed by a transparent membrane (the ovolemma or zona pellucida [a]), and contains a noncentral nucleus (the germinal vesicle, c).

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

In 1 the follicle-cells still form a simple, and in 2 a double, stratum round the young ovum; in 2 they are beginning to form the ovolemma or the zona pellucida (a).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

By the vibrations of these slender hairs the gastrula of the Amphioxus swims about in the sea, when it has pierced the thin ovolemma, like the gastrula of many other animals

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

But in most animals they at once begin to change; the change consists partly in the formation of connections with the yelk, which serve to nourish the ovum, and partly of external membranes for their protection (the ovolemma, or prochorion).

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

When the Ascidia-larva has attained this stage of development it begins to move about in the ovolemma.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The little globule is surrounded by a thick capsule of glass-like transparency, the zona pellucida, or ovolemma pellucidum

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

The globular yelk is surrounded by the thick transparent germinal membrane (ovolemma, or zona pellucida).

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

The human ovum after issuing from the Graafian follicle, surrounded by the clinging cells of the discus proligerus (in two radiating crowns). z ovolemma (zona pellucida, with radial porous canals), p cytosoma (protoplasm of the cell-body, darker within, lighter without), k nucleus of the ovum (embryonic vesicle).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

During these important processes, that take place in just the same way in the Amphioxus, a tail-like projection grows out of the posterior end of the larva-body, and the larva folds itself up within the round ovolemma in such a way that the dorsal side is curved and the tail is forced on to the ventral side.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Inside a structureless, thin, but firm membrane (ovolemma, Figure 1.52 c) we find a large, quite clear, and transparent globule of albumin (d).

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