. Fishes. Fishes. 222 The Holocephali, or Chimaeras and the huge jet-black ChimcBra purpurascens in Hawaii and Japan. None of these species are valued as food, but all impress the spectator with their curious forms. The fossil ChimcErida, although numerous from Triassic times and referred to several genera, are known chiefly by their teeth with occasional fin-spines, frontal holders, or impressions of parts of the skeleton. The earhest of chimasroid remains has. Fw. 158.—Elephant-fish, Chimcera colliei Lay & Bennett. Monterey. been described by Dr. Charles D. Walcott * from Ordovician or L
. Fishes. Fishes. 222 The Holocephali, or Chimaeras and the huge jet-black ChimcBra purpurascens in Hawaii and Japan. None of these species are valued as food, but all impress the spectator with their curious forms. The fossil ChimcErida, although numerous from Triassic times and referred to several genera, are known chiefly by their teeth with occasional fin-spines, frontal holders, or impressions of parts of the skeleton. The earhest of chimasroid remains has. Fw. 158.—Elephant-fish, Chimcera colliei Lay & Bennett. Monterey. been described by Dr. Charles D. Walcott * from Ordovician or Lower Silurian rocks at Canon City, Colorado. Of the species called Dictyorhabdus priscus, only parts supposed to be the sheath of the notochord have been preserved. Dr. Dean thinks this more likely to be part of the axis of a cephalopod shell. The definitely known Cliimccrida; are mainly confined to the rocks of the Mesozoic and subsequent eras. IscJiyodiis priscus (avitus) of the iower Jura resembles a modern chimxra. Granodus oweni is another extinct chimaera, and numerous fin-spines, teeth, and other fragments in the Cretaceous and Eocene of America and Europe are referred to Edaphodon. A species of Chimcera has been recorded from the Pliocene of Tuscany, and one of CaVorhynchus from the greensand of New Zealand. Other American Cretaceous genera of chimosroids are Mylognathus, Bryactinus, Isotccnia, Leptomybis, and Sphagepcea. Dental plates called Rhynchodus are found in the Devonian. Rhinochimaeridse.—The most degenerate of existing chimaeras belong to the family of Rhinochimccridce, characterized by the long flat soft blade in which the snout terminates. This struc- * Bulletin Geol. Soc. America, 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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