We find that no vesicle wants its coating of this earthy mineral.
The proper capsule of the Graafian vesicle is composed of two layers.
There is no appearance of vesicle, nor is the skin discoloured.
Near each of their spiracles also is a vesicle which appears to be a reservoir.
This vesicle, of a milky-white colour, and filled with liquid, is the scolex.
Now, this vesicle is invariably tinged with a different hue from the rest of the being.
On the first half of the fourth day the vesicle is still very small, and its growth is not very rapid.
The line ge in B shews the extension of the hypoblast round the inner side of the vesicle.
The ring around the embryonic area where the walls of the vesicle are formed of epiblast and hypoblast.
The embryonic area is formed in the usual way, and its long axis is placed at right angles to that of the vesicle.