. The elasmobranch fishes. Chondrichthyes. 2 THE ELASMOBRANCH FISHES there are many of the present-day characteristics peculiar to the sharks. In addition, bj' the structure of its limbs and tail, it suggests relationship to the interesting group of Dipnoans or lungfishes. Equallj' as interesting as the extinct forms preserved to us in the rocks are others, less ancient though the}' be, which have come down to us in flesh and blood. Of these living representatives of the past some are among the most. Fig. 10. Cladoselachus. (From Dean.) interesting and instructive of forms, interesting as anti
. The elasmobranch fishes. Chondrichthyes. 2 THE ELASMOBRANCH FISHES there are many of the present-day characteristics peculiar to the sharks. In addition, bj' the structure of its limbs and tail, it suggests relationship to the interesting group of Dipnoans or lungfishes. Equallj' as interesting as the extinct forms preserved to us in the rocks are others, less ancient though the}' be, which have come down to us in flesh and blood. Of these living representatives of the past some are among the most. Fig. 10. Cladoselachus. (From Dean.) interesting and instructive of forms, interesting as antiquities are interesting, instructive as all generalizations are instructive. Among these forms known to us on the California coast are Heterodontns francisci (fig. 17), whose genus is the sole survivor of a group, twenty-five genera of which are buried in the rocks; and Hexanchus corinus and Heptanchus maculatus (fig. 13), the latter. 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 Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press
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