ME. E. LYDEKKEE ON A JAW OF HYOTHEEIUM. 



23 



Discussion". 



Dr. Blakfoed described the Island of Perim and the mode of 

 occurrence of the fossils, and showed that the age of the beds was 

 but roughly indicated by their relations to those on the mainland, 

 and was better determined, as had been done by Mr. Lydekker, by 

 the affinities of the fossils with those in the Sind beds, the age of 

 which was accurately demonstrated by marine fossils. 



