. The Cambridge natural history. Zoology. 498 FISHES CHAP. bodied Holosteans with rhombic scales, rarely, as in Aeiheolepis, cycloid in the caudal region. All the fins possess fulcra. Teeth more or less conical, with a tendency to become tritoral in certain genera. Jugular plate present or absent. Acentro23Jiorus (Upper Permian); Semionotus (Trias of England, Germany, S. Africa, and N. America); Lepidotus (Fig. 292) (Trias of G-ermany, Jurassic of Europe and India, Cretaceous of Brazil); the deep- bodied Dapcdius (Lias of Dorset, Fig. 293), and Aetheolepis (Jurassic of New South Wales) are cha
. The Cambridge natural history. Zoology. 498 FISHES CHAP. bodied Holosteans with rhombic scales, rarely, as in Aeiheolepis, cycloid in the caudal region. All the fins possess fulcra. Teeth more or less conical, with a tendency to become tritoral in certain genera. Jugular plate present or absent. Acentro23Jiorus (Upper Permian); Semionotus (Trias of England, Germany, S. Africa, and N. America); Lepidotus (Fig. 292) (Trias of G-ermany, Jurassic of Europe and India, Cretaceous of Brazil); the deep- bodied Dapcdius (Lias of Dorset, Fig. 293), and Aetheolepis (Jurassic of New South Wales) are characteristic Fig. 293.—Restoration of Dajjedius poHtus. Lower Jurassic, Dorset. (After Smith Woodward.) Fam. 2. Macrosemiidae.—Closely related to the Semionotidae, but with a more extended dorsal fin. Ilacrosemius (Upper Jurassic of England, Germany, France); iVbtof/o^ftts (Upper Jurassic of Naples, Bavaria, France); Petalopteryx (Upper Cretaceous of Syria). Fam. 3. Pycnodontidae.—Highly specialised deep-bodied Fishes, with a small mouth and characteristic grinding or tritoral teeth. Scales rhombic. Fulcra absent. Dorsal and anal fins long. There is no jugular plate. The family ranges from the Lower Lias to the Lower Eocene, inclusive. Mesodon, Ifesturus, Gyrodus, and Microdon are Jurassic genera. Coccodus and Xenopholis occur in the Upper Cretaceous of Syria (Mount Lebanon), and Pycnodus in various European Eocene formations. Fam. 4. Eugnathidae.—Large - mouthed, elongate fusiform. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
