OPTHALMOSAURUS PLEYDELLI. 



13 



preserved in the collection of Mr. A. N. Leeds. The accompanying 

 woodcut (fig. 2) shows part of a right pectoral limb of the latter 

 species lately presented by Mr. Leeds to the British Museum. It 

 will be seen from the figure that the humerus is a comparatively 

 elongated bone with the postaxial distal-facet relatively small, and 

 narrowing to a sharp point, and since a number of examples in the 

 collection of Mr. Leeds exhibit precisely the same feature, the 

 small size and pointed extremity of the portaxial part of the 

 humerus may be regarded as characteristic. 



Fig 2. Dorsal aspect of part of the right pectoral limb of Ophthalmosaurus icenicus, 

 with a view of the distal extremity of the humerus from the Oxford clay of Peterborough, 

 J nat. size, h humerus, a trochanter ridge of ditto, r radius, u ulnar, p pisiform. 



