CHELONIA. 



No teeth; jaws covered with horny sheaths. Vent round or 

 ongitudinal; copulatory organ present, single. 



^ig. 3. — Shell of Chdoiie mydas, with epidermal horny shields. 



A. Carapace. B. Plastron. 



a. Abdominal. h. Humeral. n. Nuchal. 



an. Anal. ic/. Intergular. p. Pectoral. 



c. Costal. i7n. Inframarginal. sc. Supracaudal. 



/'. Femoral. m. Marginal. v. Yertebral. 

 ff. Gular. 



The anterior inframarginal is also termed axillary, and the posterior inguinal. 



The Tortoises and Turtles of the Malay Peninsula are referred 

 to four families : — 



Carapace and plastron without epidermal shields, 

 covered with a soft skin ; limbs with three 

 claws 



Carapace and plastron covered with epidermal, 

 horny shields ; limbs with fom- or five claws . 



Carapace and plastron covered with epidermal, 

 horny shields ; limbs paddle-shaped, with one 

 or two claws 



Carapace formed of mosaic-like small bony 

 plates, separated from the vertebrae and ribs ; 

 limbs paddle-shaped, without claws . 



Trionychidae, p. 8. 

 Testudinidae, p. 12. 



Chelonidae, p. 27. 



Sphargidae, p. 30. 



