ANOMALOUS REPTILES 
109 
D. lacerticeps (“ lizard-headed,” Tig. 26) is only six inches long. 
Dicynodonts have since been found in the Gondwana series 
in Central India, and in the Elgin Sandstone, Scotland. 
The vertebrae, or joints of the backbone, are hollow on both 
sides (biconcave) — a feature common to fishes and Labyrintho- 
donts. Probably they were good swimmers, and spent much 
of their time in the water; but it is quite clear that they 
were air-breathers, and so must have come up to the surface 
to breathe. 
The genus Oudenodon,^ although it has no teeth, so closely re- 
sembles the Dicynodon that it must be included in the same 
family. The skull is shown in Fig. 26. Professor Owen even 
suggested that the absence of teeth might merely denote a difference 
of sex; but this view is not accepted by others. The general 
shape of the skull is very similar to that of Dicynodon, and the 
Fig. 27. — Fore limb of Dicynodon. 
(After Owen.) 
Fig. 28.~Arm-bone (humerus) of 
Dicynodon. ^ natural size. (After 
Owen.) 
Greek — ouden, nothing ; odous, odontos^ tooth. 
