. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. I 70 Darwin, and after Darwin. It has long been noticed that there are among fishes two styles of tail-fins. These are the evcn-lobed, or homocercal (Fig. 68), and the uneven-lobed, or heterocercal (Fig. 69). The one is characteristic of ordinary fishes (teleosts), the other of sharks. Fig. 69.—Heterocercal Tail, showint^ (A) external form and (B) internal Please note that these images are extracted from scanned page images that may have been digitall
. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. I 70 Darwin, and after Darwin. It has long been noticed that there are among fishes two styles of tail-fins. These are the evcn-lobed, or homocercal (Fig. 68), and the uneven-lobed, or heterocercal (Fig. 69). The one is characteristic of ordinary fishes (teleosts), the other of sharks. Fig. 69.—Heterocercal Tail, showint^ (A) external form and (B) internal 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 Romanes, George John, 1848-1894. Chicago The Open Court Pub. Co
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