ANOMODONTIA. 



155 



are given in the accompanying figs. 98 A, B. The ulna exhibits 

 a well-defined olecranon process. 



Numerous remains which seem to be referable to Therio- 

 donts are known from the Permian of Texas and Illinois, U. S. A. ; 



FIG. 98. 



Theriodesmug phylarchus ; restoration of carpus (A) by Seeley, of the whole 

 manus (B) by Bardeleben, slightly reduced. Karoo Formation (Permian 

 or Triassic) ; Fraserberg, Cape Colony. B, radius; U, ulna; ce., centralia; 

 CM., cuneiform; ep., epiphyses; lu., lunar; mg., magnum; pi., pisiform; 

 Ppd., distal segment of pre-pollex; Ppp., proximal segment of pre-pollex; 

 sc., scaphoid; td., trapezoid ; tm., trapezium; u, unciform ; i v, meta- 

 carpals ; 1 3, phalanges. 



and the fragmentary skulls named Deuterosaurus and Rhopa- 

 lodon from the Permian of Russia also represent animals of 

 much the same type. Some of these forms do not appear to 

 have possessed the false palate below the true posterior nares, 

 while Rhopalodon distinctly exhibits a ring of sclerotic plates. 



