Plate 12 



FAMILIES PELOMEDUSIDjE AND 

 CHELYDIDM 



AFRICAN MUD TURTLE AND AUSTRALIAN SNAKE- 

 NECKED TURTLE 



The illustration shows how the members of the Superfamily Pleu- 

 rodira bend the neck in lateral curves in drawing the head into the 

 shell. 



AFRICAN MUD TURTLE Sternotharus derbianus. 

 A fully grown shell is a foot long. 



