. The coal measures Amphibia of North America. Amphibians, Fossil; Paleontology; Paleontology. i4o 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, 7a, 1092 G, 1093 G, 1095 G, 153, and others unnumbered in the American Museum of Natural History; in the U. S. National Museum are the fol- lowing: Nos. 4458, 4463, 4464, 4514. (Plate 20, fig. 2.
. The coal measures Amphibia of North America. Amphibians, Fossil; Paleontology; Paleontology. i4o 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, 7a, 1092 G, 1093 G, 1095 G, 153, and others unnumbered in the American Museum of Natural History; in the U. S. National Museum are 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 are conical and sharp, longitudi- nally striate, and anisodont. There seemstobe evidence of palatineor 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 na
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