382 ON TWO SKULLS EKOM THE WEALDEN AND PUKBECK FORMATIONS . 



Discussion. 



Prof. Owen said that 40 years ago he had entered on the study of 

 the Wealden and Purbeek Crocodiles, the results of which appeared 

 in the second part of his " Report on British Possil Reptiles," in the 

 volume of the British Association ' Reports ' for 1841. He had then 

 recognized two new genera, OoniopTiolis and Suchosaurus, besides 

 Deslongchamps's Poilalopleuron, as British. In the expanded and 

 illustrated form in which the subjects of the 'Report' have succes- 

 sively appeared as ' Monographs,' the Upper Mesozoic Crocodilia had 

 waited to a late period. The new genus Hylceochampsa was issued 

 in the Palseontographical volume for 1875 ; the new species of Pol- 

 Icilopleuron in that for 1876 ; the Purbeek Crocodiles in that for 

 1877. What he had to say on that subject had gone to press in 

 that year. It was but yesterday that he had learned that Mr. 

 Hulke had also been at work on that subject, and had suggested a 

 part of the operations of clearing off matrix from specimens which 

 were constantly and systematically subjected to such work on being 

 received into the British Museum. In the volumes which Prof- 

 Owen hopes shortly to issue on British Fossil Reptiles in general, 

 Mr. Hulke's aid will be gratefully acknowledged. 



