The author re-examines the remains of Theriodesmus , and contests the interpretation of the carpus given by Professor Bardeleben, producing specimens of South African Reptiles in which there is a single bone beneath the radius, as in Theriodesmus . This character is shown in a small skeleton, at present undescribed, which the author obtained from Klipfontein, Fraserberg, which he regards as referable to a new genus. Other evidence is produced supporting the interpretation of three bones in the proximal row in the carpus, in a specimen from Lady Frere. The author then compares the fore-limb of Theriodesmus with that of Pareiasaurus , which was obtained subsequently, and arrives at the conclusion that the types of limb are too closely related to be referred to different orders of animals, and therefore that Theriodesmus must be transferred from the Mammalia to the Therosuchia.