. Fishes. Fishes. 23° The Crossopterygii Lepisosteus. In Glyptopomus these scales are sculptured, in the others smooth. In Osteolepis, Thursius, Diplopterus, and Glyptopomus a pineal foramen is present on the top of the head. This is wanting in Parabatrachns {Megalichthys of authors). In Osteolepis, Thursius, and Parabatrachus the tail is heterocercal, ,«..-*S-***^'. Fio. 163 —Oyroptychius microlepidotus Agassiz. Devonian. Family Megalich- tliyidm. (After Pander.) while in Diplopterus and Glyptopomus it is diphycercal. Osteo- lepis macrolepidotus and numerous other species occur in the Lower D
. Fishes. Fishes. 23° The Crossopterygii Lepisosteus. In Glyptopomus these scales are sculptured, in the others smooth. In Osteolepis, Thursius, Diplopterus, and Glyptopomus a pineal foramen is present on the top of the head. This is wanting in Parabatrachns {Megalichthys of authors). In Osteolepis, Thursius, and Parabatrachus the tail is heterocercal, ,«..-*S-***^'. Fio. 163 —Oyroptychius microlepidotus Agassiz. Devonian. Family Megalich- tliyidm. (After Pander.) while in Diplopterus and Glyptopomus it is diphycercal. Osteo- lepis macrolepidotus and numerous other species occur in the Lower Devonian. Diplopterus agassizii is common in the same horizon. Megalichthys hibberti is found in the coal-measures, and Glyptopomus minimus in the Upper Devonian. Palceosteus is another genus recently described. The OnychodontidcB are known from a few fragments of Onychodus sigmoides from the Lower Devonian of Ohio and Onychodus anglicus from England. Order Actinistia.—In the Actinistia there is a single fin-ray to each basal bone, the axonosts of each ray fused in a single. 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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