of the Fossil Reptile Endothiodon and Related Genera

The first recognized dicynodont genus known to possess cheek teeth was Endothiodon bathystoma, described by Owen in 1876. The specimen consisted of the front half of the skull and lower jaw. Owen described it, with good figures, as having several rows of teeth in both upper and lower jaws. He later (1879) described another lower jaw, similar in size, and shape, which he believed to belong to the same species; this showed three clear rows of teeth. A moderately complete skeleton, also ascribed to this species, was described by Broom (1905). The arrangement of teeth in this skeleton was not clear, but there appeared to be a main row of nine or 10 teeth. Other teeth appeared beside the posterior part of this row, so that posteriorly there were three or four teeth side by side. Such appeared to be the condition in both upper and lower jaws. Broom later (1915) ascribed another skull and lower jaw to Endothiodon bathystoma. The dentition was somewhat different, as there was a gap in the dental series in both the 'upper and the lower jaws. Broom suggested that the specimen might be an old individual. Seeley in 1892 described and figured a lower jaw in which there wer