20 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Nov. 10, 
a smaller postero-external moiety. The former presents a convex 
articular surface, which looks obliquely downwards and outwards. 
The postero-external moiety is an irregularly concayo-convex sur- 
face, which projects suddenly and considerably beyond the level of 
the other. 
Fig. 1. A, the right tibia of Megalosawrus. The posterior margins of the 
articular condyles are supposed to be in the plane of the paper ; a—0, a line 
traversing the median plane of the distal end of the bone; d, the summit of 
the cnemial crest. The strong fibular ridge is seen on the outer surface of 
the proximal third of the bone, 3 
B, the distal extremity of the same hone projected upon the proximal 
end, which is drawn in outline. The letters as before, except c the outer 
and c’ the inner condyle. 
Fig. 2. A & B, corresponding views of the tibia of a young Fowl. ‘The letters 
have the same signification. 
