. Carnegie Institution of Washington publication. 140 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. Type: It is impossible to determine which one of the specimens is the type. There are numerous representatives of the species, as follows: Nos. 140, 1096 G, 8345 G, 8555 G, 1089 G, 2, 132, 133, no number, 1094 G- 8545 G, 8677 G, 1159 G, 105, no number, 1091 G, 70, 1092 G, 1093 G, 1095 G, 153, and others unnumbered in the American Museum of Natural History; in the U. S. National Museum arc the fol- lowing: Nos. 4458, 4463, 4464, 4514. (Plate 20, fig. 2.) Horizon and locality: Linton, Ohio, Coal Me
. Carnegie Institution of Washington publication. 140 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. Type: It is impossible to determine which one of the specimens is the type. There are numerous representatives of the species, as follows: Nos. 140, 1096 G, 8345 G, 8555 G, 1089 G, 2, 132, 133, no number, 1094 G- 8545 G, 8677 G, 1159 G, 105, no number, 1091 G, 70, 1092 G, 1093 G, 1095 G, 153, and others unnumbered in the American Museum of Natural History; in the U. S. National Museum arc the fol- lowing: Nos. 4458, 4463, 4464, 4514. (Plate 20, fig. 2.) Horizon and locality: Linton, Ohio, Coal Measures. The most abundant species of the Linton Coal Measures. There are over three dozen specimens preserved in the Newberry collection. The species is a clearly marked one, as a rule, though there is great variation in the size of the body and the form of the vertebrae. Though there are several apparently complete skulls pre- served in the collection, it is impossible to make out the morphology of the ele- ments on account of the amount of crushing to which the skulls have been subjected. The head is lancet-shaped, and the muzzle very elongate, slender, and acute at the extremity. The head is in fact a miniature of an ichthyosaur cranium. (Plate 20, fig. 2.) The orbits are large and posterior to the median line. The anterior por- tion of the skull is narrow, poste- riorly truncate, and the mandibular angle is projecting. The posterior portion of the mandible is sculp- tured. Possibly the entire cranium was also, and this has been lost; in fact, this sculpturing is indicated in one or two specimens. The teeth . FIG. 30.—Restoration of Ptvonius. X I. are conical and sharp, longitudi- nally striate, and anisodont. There seemstobe evidence of palatine or pterygoid teeth, though this needs confirmation. The pectoral plates are well preserved, with the interclavicle a narrow oval, with anterior and posterior prolongations. In one speci- men it is sculptured. The clavicles are nar
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