ON ELGIN SANDSTONE REPTILES 91 



ton's figure of its skull, seen from the side, is reproduced, 

 about one-half less than the natural size. 



The other Dicynodont genus Gcikia is, like the South 

 African Oudenodon, entirely edentulous ; but, according to Mr. 

 Newton, its affinities are mmevfi\;hPtyckognathus(Ptyckosiagum 

 Lydekker), a genus occurring both in Africa and India. 

 Ptychognatlms, however, has, like D icy no don and Gordonia, a 

 pair of large tusks, and the maxillary and pre-maxillary bones 

 are much produced, whereas Geikia has not only no teeth, but 



FIG. 2. Side view of the skull of Geikia Elginensis, Newton, two-thirds natural 

 size, from a cast in gutta percha. Reduced from E. T. Newton's figure, Plate 

 XXXVI. Fig. 2. Lettering as in Fig. i. Ij, Lower jaw. 



the skull in front of the orbits is extremely short, as is shown 

 in the accompanying Fig. 2. One species is recognised : 

 Geikia Elginensis. 



The Pareiosauria are a group of extinct reptiles, con- 

 sidered by Seeley to be most nearly related to the Anomo- 

 dontia, and which in many respects bear a remarkable 

 resemblance to the Labyrinthodont Amphibia ; as, for 

 instance, in the roofing over of the temporal fossae, the pitted 

 sculpture of the external cranial bones, and the presence in 

 Pareiosaurus, at least, of the so-called mucous canals. The 

 pelvis is also described as being of Labyrinthodont type. To 



