. Fishes. Fishes. 274 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 o
. Fishes. Fishes. 274 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 Ctenothrissidffi.—A related family, Ctenothrissida, is represented solely by extinct Cretaceous species. In this group. Fig. 308.—Ctenothrissa vexillifera Pictet, restored. (After Woodward.) Mt. Lebanon Cretaceous, the body is robust with large scales, ctenoid in Ctenothrissa, cycloid in Aulolepis. The fins are large, the belly not serrated, and the teeth feeble. Ctenothrissa vexillifera is from Mount Lebanon. Other species occur in the European chalk. In the small family of Phractolmnidce the interopercle, according to Boulenger, is enormously developed. The Notopteridae.—The Notopteridce is another small family in the rivers of Africa and the East Indies. The body ends in a long and tapering fin, and, as usual in fishes which swim by. 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 and Company
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