. Carnegie Institution of Washington publication. THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. The body of the present species is elongate and slender, with a long neck and prob- ably a long tail. Ribs, as preserved, are 19 to 22, though there may possibly have been more. They are moderately curved backwards, have intercentral articulation, are attenuated at the distal extremity, and are single-headed. The anterior ribs are stouter, with a widened upper portion and attenuated distal part. The posterior ribs are more slender. There are evidences of 28 vertebras present. All regions of the verte
. Carnegie Institution of Washington publication. THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. The body of the present species is elongate and slender, with a long neck and prob- ably a long tail. Ribs, as preserved, are 19 to 22, though there may possibly have been more. They are moderately curved backwards, have intercentral articulation, are attenuated at the distal extremity, and are single-headed. The anterior ribs are stouter, with a widened upper portion and attenuated distal part. The posterior ribs are more slender. There are evidences of 28 vertebras present. All regions of the vertebral column are present and the dorsal region is preserved entire. The cervical series is repre- sented by the posterior vertebrae only. These are very indistinctly preserved. The dorsal vertebrae are elongate and were prob- ably amphicoelous, although this has not been definitely determined. They are ex- panded at each end, thus ending in a slightly raised rim. The single-headed ribs articulate between the vertebrae. The exact number of the dorsal series can not be ascertained, although this may have been 25. The spines of the vertebrae are not determinable, since the animal is preserved on its back. The caudal vertebrae are represented by two patches of the remains of what was once probably the entire series. Cope ascribes 70 mm. to the tail, but I do not find that much. The specimen may have been mutilated since he studied it. The caudals are slender and, like the dorsals, are expanded at the ex- tremities. The scapular arch is not preserved, but the pelvic arch is represented by the two iliac bones in good state of preservation. These are short, flat bones expanded at the anterior extremity, as preserved. They lie turned a little to each side of the vertebral column and partially obscure the femora. The iliac bones are quite characteristic of this form, since similar-shaped elements have not been observed in any of the other Carboniferous forms from the same deposit. The gr
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