. Degeneration : a chapter in Darwinism. Degeneration; Evolution. TiG. 19.—Degeneration of Ascidian Tadpole to form the adult. The black pieces represent the rock or stone to which the Tadpole has fixed its head. MOUTH TAIL. Fig. 20 —Very young Ascidian with only two gill-'^lits. CoTipare with Fig 15 ; which is, however, seen from the other side, so that left there corresponds to right 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
. Degeneration : a chapter in Darwinism. Degeneration; Evolution. TiG. 19.—Degeneration of Ascidian Tadpole to form the adult. The black pieces represent the rock or stone to which the Tadpole has fixed its head. MOUTH TAIL. Fig. 20 —Very young Ascidian with only two gill-'^lits. CoTipare with Fig 15 ; which is, however, seen from the other side, so that left there corresponds to right 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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