PLATE XX. 



Fig. 1. Profile view of a right lower last true molar of the broad-crowned variety of 

 U. antiquus, in the possession of J. J. Colman, Esq., M.P., from the Porest Bed at Corton, 

 Suffolk. (Much reduced.) 



Pig. 1 a. Crown view of fig. 1. (^ natural size.) 



Pig. 2. Crown view of a right upper last true molar of the broad-crowned variety of 

 U. antiquus from the same locality. (^ natural size.) 



Pig. 3. Fragment of a crown of a true molar of U. primigenius {?), in the possession 

 of A. Savin, Esq., from the Porest Bed, Overstrand, near Cromer, Norfolk. (Natural 

 size.) 



