54 EMYSMEGACEPHALA. 



this class generally, approaching even the Chelonura in its disposition to bite when 

 disturbed. 



General Remarks. Though having the general characters of the Emys tribe, 

 the E. megacephala might, from the great size of the head, almost form the type 

 of a new genus, approaching in this respect the Platysternon of Gray,* from which 

 it differs however, among other characters, in being able to draw the head under 

 the shell. 



* Zool. Jour., Lond., Part I., p. 106. 



