LIV.—The dentary of Tritylodon and the systematic position of the Tritylodontidæ

Summary

Among newly discovered rich skeletal material of Tritylodon the hitherto unknown lower dentition has been found. The lower jaw of Tritylodon is a compound bone. The dentary is described in detail. Tritylodon is shown to be a reptile in spite of its numerous mammalian osteological characters, and especially in spite of its upper and lower cheek-teeth, which have distinctly divided roots.