Plate 13 



FAMILY CUELYDIDJS 



AFRICAN MUD TURTLE AND AUSTRALIAN SNAKE- 

 NECKED TURTLE 



The shells are seen from beneath. Note how the members of the 

 Superfamily Pleurodira bend the neck in protecting the head. 



SOUTH AMERICAN SNAKE-NECKED TURTLE 

 Hydromedusa tectifera. 



The shell of an adult is about six inches long. 



