. Degeneration : a chapter in Darwinism. Degeneration; Evolution. JO DEGENERA TION. the other of these apertures. If we remove the « leathery outer-case (Fig. 15), we find that there is a soft creature within which has the following parts :—Leading from the mouth a great throat, fol- lowed by an intestine. The throat is perforated by innumerable slits, through which the water passes. Fig. 14.—a colony of compound Ascidians (Botryllus) growing on a piece of sea- weed (Fucus). Each star corresponds to eight or more conjoined Ascidians. Natural size. into a chamber—the cloaca : in passing, the wa
. Degeneration : a chapter in Darwinism. Degeneration; Evolution. JO DEGENERA TION. the other of these apertures. If we remove the « leathery outer-case (Fig. 15), we find that there is a soft creature within which has the following parts :—Leading from the mouth a great throat, fol- lowed by an intestine. The throat is perforated by innumerable slits, through which the water passes. Fig. 14.—a colony of compound Ascidians (Botryllus) growing on a piece of sea- weed (Fucus). Each star corresponds to eight or more conjoined Ascidians. Natural size. into a chamber—the cloaca : in passing, the water aerates the blood which circulates in the framework of the slits. The intestine takes a sharp bend, which causes it to open also into the cloaca. Be- tween the orifice of the mouth and of the cloaca there is 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 : Macmillan and Co.
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