52 



MAEINE EEPTILES OF THE OXFOED CLAY. 



of the proximal end which is marked Lb. in the figure, Avill be nearly vertical, and pM. 

 will form the upper edge, which is somewhat curved and makes an angle a little 



Text-fig. 36. 



d.v A. 



Left liumerus of Oplitlmhnosaurus : A, proximal end: B, ventral (palmar) side: C, distal end; D, distal end 

 of another example showing the preaxial prominences. (A-C, E. 2134 ; D, E. 2160 : all j nat. size.) 



a.-l>., line marking the direction of the distal expansion of the bone \dth reference to the proximal end ; 

 a.h., loner border ; d.r., deltoid ridge ; l.b., anterior border ; p.l., upper border ; p.f., facet for 

 pisiform ; pr., pr.', projections on anterior angle ; r.f., facet for radius ; ?«./., facet for ulna. 



less than a right angle with l.b. Posteriorly it passes by a rounded angle into 

 the posterior border, which forms a sigmoid curve, the lower end rising into the 



