. Carnegie Institution of Washington publication. THE TEMNOSPONDYLOUS AMPHIBIA. 179 the intercentrum and pleurocentrum, in the greater size, in the larger proportions of the neurocentrum, and the greater proportionate size of the intercentra. Spondylerpeton spinatum Moodie. MOODIE, Kans. Univ. Sci. Bull., VI, No. 2, pp. 355-357, pi. 8, figs. I and 2; pi. 9, fig. i, 1912. Type: Specimen No. 793 (26) and obverse, Yale University Museum. Horizon and locality: Mazon Creek, near Morris, Illinois. The species is very imperfectly known. Sufficient is present, however, to show its wide generic differe
. Carnegie Institution of Washington publication. THE TEMNOSPONDYLOUS AMPHIBIA. 179 the intercentrum and pleurocentrum, in the greater size, in the larger proportions of the neurocentrum, and the greater proportionate size of the intercentra. Spondylerpeton spinatum Moodie. MOODIE, Kans. Univ. Sci. Bull., VI, No. 2, pp. 355-357, pi. 8, figs. I and 2; pi. 9, fig. i, 1912. Type: Specimen No. 793 (26) and obverse, Yale University Museum. Horizon and locality: Mazon Creek, near Morris, Illinois. The species is very imperfectly known. Sufficient is present, however, to show its wide generic differences from other forms of the Cricotidae. These characters are of a phylogenetic nature and indicate the more primitive nature of the present form, as we would expect from its geological position. The sutures separating the four vertebral elements are clearly ap- parent. The pleurocentral-neurocentral suture is apparent in 4 vertebrae. There is but a single pleurocentrum preserved complete. This shows the form of the attached neurocentrum and chevron, which corresponds to the hypo- centrum pleurale according to Fritsch. The pleurocentrum is flattened laterally, with a rather large canal for the noto- chord. Its sides are marked with 4 longitudinal grooves. Surfaces for the attachment of the ribs are not present, and for this reason, as well as the pres- ence of chevrons, the vertebrae are sup- posed to be caudals. As such they rep- resent an animal of some 3 or 4 feet in length. It was the giant of the Mazon Creek Amphibia. (Plate 4, figs. 1,2.) Attached to the upper side of pleurocentrum by a sutural union occurs the neurocentrum. The neural arch is quite large and is oval in outline, although somewhat constricted at the tip. The spine of the neurocentrum is rather long and broad at the base, measuring 12 mm. across the anterior zygapophysis. The neuro- centrum is laterally flattened and ends in a rather acute and somewhat rugose point. It was probably tipped with cartilage. Th
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