PLATE 56 

 Fig. I. Diptenis sp. A small dental plate, in matrix. X 2. E 2015, p. 171. 



Figs. 2, 2a. Diptenis gemmalus, n. sp. Type. Dental plate, in matrix, E 

 2517, p. 170. Fig. 2isX3; 2a is X 5, to bring out the surface punctse. 



310 



