4 FOSSIL REPTILIA OF THE LONDON CLAY. 



the recent skeletons of Emydians, that any particular character of the exterior surface 

 of the bones of the trunk is repeated on the upper surface at least of the bones of the 

 head. This comparison, in the present instance, indisposes me to regard the fossil in 

 question as having belonged to the Umys levis, or to the Umys bicarinata, or to the 

 Platemys BullocMi with the punctate plastron. I should be rather led to select the 

 Platemys Bowerbanldi from the character in question, as exhibited by the carapace and 

 plastron described at p. 66. But, in provisionally registering the fossil skull in question 

 under the name of Platemys Bowerbankii, I should wish to be understood as by no 

 means vouching for the accuracy of the reference. The conjecture rests solely on the 

 character above referred to, which is far from being decisive ; and its only value is, 

 that it happens to be the only one by which we can be guided at present in forming 

 any opinion at all as to the specific relations of the fossil in question. 



