. A guide to the study of fishes. Fishes; Zoology; Fishes. 48 Isospondyli in which region Chirocentrus polyodon occurs as a fossil. Numer- ous fossil genera related to Chirocentrus are enumerated by Woodward, most of them to be referred to the related family of IchthyodectidcB (Saurodontidcs). Of these, Portheus, Ichthyodec- tes, Saurocephalus (Saurodon), and Gillicus are represented by numerous species, some of them fishes of immense size and great voracity. Portheus molossus, found in the Cretaceous of Nebraska, is remarkable for its very strong teeth. Species of other genera are represented
. A guide to the study of fishes. Fishes; Zoology; Fishes. 48 Isospondyli in which region Chirocentrus polyodon occurs as a fossil. Numer- ous fossil genera related to Chirocentrus are enumerated by Woodward, most of them to be referred to the related family of IchthyodectidcB (Saurodontidcs). Of these, Portheus, Ichthyodec- tes, Saurocephalus (Saurodon), and Gillicus are represented by numerous species, some of them fishes of immense size and great voracity. Portheus molossus, found in the Cretaceous of Nebraska, is remarkable for its very strong teeth. Species of other genera are represented by numerous species in the Cretaceous of both the Rocky Mountain region and of Europe. ^ The Ctenothrissidae.—A related family, Ctenothrissidcz, is represented solely by extinct Cretaceous species. In this group. 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 Jordan, David Starr, 1851-1931. New York, H. Holt
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