154 Prof. H. G. Sceley on 



-^ inch in eacli measurement, and slightly ol)lique, as in Agro- 

 saurus. It is shown to be a right tibia by the manner in 

 which the surface from wliich the astragalus has become lost is 

 excavated on its external border, as in A(jrosannis ; so that the 



Anterior aspect. 



Fibular aspect. 



Distal articular 

 surface. 



Dist il end of the left tibia of Pala-osaunis. Brist. Mus. no. 53. 

 4 nat. size. 



astragalus must have been subquadrate, but, as in many Saur- 

 ischians, deepest on the fibular border. Tiiere is an indication 

 by an ascending groove of a small ascending talon, making 

 some aj)proach to Dimosaurus. 



The tibia on slab 63 shows less than 6 inches of its proximal 

 end, which is only 2 inches wide, and has the cnemial crest 

 defined by a small superior cavity, which is continued down- 

 ward by the fibular groove on tlie external aspect. The 

 shaft of the bone is about j-^ inch wide in the middle, and 

 appears to be expanding slightly towards the distal fracture. 



The Fibula o/" Palaeosaurus. (Fig. 6.) 



A bone which I regard as being the left fibula agrees 

 closely with the tibia in its length, is of about the same 

 dimensions as the tibia no. 76 in the shaft, though but 

 little expanded at the proximal and distal ends. It may have 

 belonged to a species with rather more robust bones, such as 

 is indicated by the slab tibia, no. 63. The distal extremity, 

 which is exposed in lateral view, is strong and moderately 

 expanded, like the distal end of the tibia no. 76, which it 

 resembles in size. It has a convexly truncated distal end, 

 which is about 1^% inch wide. The bone is somewhat 

 imperfect in fracture, but has a slender shaft | inch wide, with 

 subparallel sides ; the oblique proximal end widens to about 



