Class REPTILIA. 



Cold-blooded Vertebrates breatbiiig by lungs throughout 

 their existence, the body covered with scales or scutes. Skull 

 with the parasphenoid small, if distinct, with a basioccipital 

 usually articulating with the vertebral column by a single 

 condyle. 



Eepresented in the Malay Subregion by three Orders : — 



I. EMTJDOSAUEIA, Crocodiles. 

 II. CHELONIA, Tortoises and Turtles. 

 III. SQUAMATA, Lizards and Snakes. 



Older EMYDOSATJRIA. 



Quadrate bone immovably united to cranial arches ; two 

 horizontal bony temporal arches. Cervical and dorsal ribs 

 mostly two-headed, the middle dorsals articulating with the 

 transverse processes of the neural arch. Sternum and inter- 

 clavicle present ; no clavicles ; abdominal ribs. Pubis excluded 

 from acetabulum. Teeth implanted in sockets. Ventricle of the 

 heart divided by a complete septum. Pectoral and abdominal 

 cavities separated by a muscular diaphragm. Vent longitudinal ; 

 copulatory organ present, single. 



A single family. 



