. Science from an easy chair; a second series. Science; Natural history. THE SEA-SQUIRT'S COAT 281 also a minute brain, a knob the size of a large pin's head, consisting of nerve-cells, from which pass nerve-fibres to the muscles, and also to certain organs of touch and taste. The thick translucent sac, which forms the coat of our Ascidian, is a complete closed sac, except for the two holes not far from one another, where the mouth and the orifice of the branchial chamber respectively open (see F'g- 31)' This coat or sac is one of the most peculiar. Fig. coloured star-like grow
. Science from an easy chair; a second series. Science; Natural history. THE SEA-SQUIRT'S COAT 281 also a minute brain, a knob the size of a large pin's head, consisting of nerve-cells, from which pass nerve-fibres to the muscles, and also to certain organs of touch and taste. The thick translucent sac, which forms the coat of our Ascidian, is a complete closed sac, except for the two holes not far from one another, where the mouth and the orifice of the branchial chamber respectively open (see F'g- 31)' This coat or sac is one of the most peculiar. Fig. coloured star-like growths united by a common dense jelly so as to form a mat, which adheres to a piece of brown sea- weed. This is the compound Ascidian called Botryllus. Each star consists of eight or nine little creatures like the Ascidian of Fig. 32, but they are united side by side to one another and have one common aperture (seen as a black dot in the centre of each star) for their peri-branchial chambers. Each of the constituent indi- viduals of a star has its own mouth near the edge of the circle. The drawing is of the natural size. and characteristic structures of all the varied kinds of Ascidians. They have, in reference to it, received the name " ; It consists of a dense, more or less transparent deposit, in some kinds as hard as horn and a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London, Methuen
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