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). ❋ Ernst Heinrich Philipp August Haeckel (1876)
The ovum is, the reader will remember, first surrounded by the transparent structureless ovolemma or zona pellucida (Figures 1.1 and 1.14). ❋ Ernst Heinrich Philipp August Haeckel (1876)
The globular yelk is surrounded by the thick transparent germinal membrane (ovolemma, or zona pellucida). ❋ Ernst Heinrich Philipp August Haeckel (1876)
At the same time, small structureless tufts or warts are deposited on the surface of the outer ovolemma or prochorion, which has been raised above the embryonic vesicle (Figures 1.112 to 1.114 a). ❋ Ernst Heinrich Philipp August Haeckel (1876)
The thick, outer, structureless envelope that encloses it is the original ovolemma or zona pellucida, modified, and clothed with a layer of albumin that has been deposited on the outside. ❋ 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). ❋ 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). ❋ 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 ❋ 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. ❋ Ernst Heinrich Philipp August Haeckel (1876)
When the Ascidia-larva has attained this stage of development it begins to move about in the ovolemma. ❋ Ernst Heinrich Philipp August Haeckel (1876)
In the middle of the ovolemma we see the round germinal disk (blastodiscus, c), at the edge of which (at d) the inner layer of the embryonic vesicle is already beginning to expand. ❋ Ernst Heinrich Philipp August Haeckel (1876)
The embryonic vesicle (b) has withdrawn a little from the smooth ovolemma (a). ❋ 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). ❋ 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 ❋ 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. ❋ 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). ❋ Ernst Heinrich Philipp August Haeckel (1876)
We may now disregard both the outer ovolemma and the greater part of the vesicle, and concentrate our attention on the germinative area and the four-layered embryonic disk. ❋ Ernst Heinrich Philipp August Haeckel (1876)
A first cleavage of the stem-cell (cytula), B division of same into four segmentation-cells (only two visible), C the germinal disk divides into the blastoderm (b) and the periblast (p). d nutritive yelk, f fat-globule, c ovolemma, z space between the ovolemma and the ovum, filled with a clear fluid.) ❋ Ernst Heinrich Philipp August Haeckel (1876)
Ovum of a deep-sea bony fish. b protoplasm of the stem-cell, k nucleus of same, d clear globule of albumin, the nutritive yelk, f fat-globule of same, c outer membrane of the ovum, or ovolemma.) ❋ Ernst Heinrich Philipp August Haeckel (1876)
In the centre of the granular protoplasm of the fertilised ovum (d) is seen the little, bright stem-nucleus, z is the ovolemma, with a mucous membrane (h). s are dead spermatozoa.) ❋ Ernst Heinrich Philipp August Haeckel (1876)
