252 H. G. SEELET ON THE DINOSAURS 



Fig. 3. — Left tibia of Orthomerus Dolloi. (A nat. size.) 



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A. Outer lateral aspect : c, cuemial crest. 



B. Outline of proximal end, reversed. 



C. Posterior aspect. D. Outline of distal end. 



the shaft widens distally in a wedge shape (fig. 3, c), is flattened in 

 front much more than in Iguanodon, with a moderate median concavity 

 for the ascending process of the astragalus, which was more than 2 cm. 

 (4 in.) wide. On the outer border the bone appears to have formed a 

 slight ridge in the distal 5 cm. (2 in.), though the ridge is abraded 

 and lost. 



The external fibular area, which in Dinosaurs is usually well de- 

 fined by a sharp angle, is here ill defined, about 2 cm. (-J in.) wide, and 

 almost in the same plane with the remainder of the distal end 

 of the bone. The fibular margin is sharp, sharper than in Iguanodon, 

 though, from the abrasion of the posterior surface, it appears to be 

 sharper than it really is. The fibular side appears to extend out- 

 ward more rapidly than the inner side, as usual ; but the inner side 

 does not widen rapidly, as in Iguanodon. At 8 cm. (3j- in.) from 

 the distal end the width of the bone is 6 cm. (2^- in.) ; at 10 cm. 

 (4 in.) the width is 5 cm. (2 in.), at 12 cm. (4 T 7 ) it is 4 cm. (1-| in.). 

 At 15 cm. (6 in.) from the distal end the bone is 3 cm. (1-^ in.) 

 from back to front and 3 cm. wide. 



The posterior aspect of the bone is marked by a rounded median 

 ridge (fig. 3, c), which becomes narrower and less elevated distally ; 

 two thirds of the bone lie on its fibular side, which is flattened and 



