592 



REPTILIA 



[CH 



FIG. 293. A. dorsal and B. ventral view of the carapace of a Loggerhead 

 Turtle, Thalassochelys caretta. After Owen. In A the outlines of the 

 superficial horny scales constituting the tortoise-shell are indicated by 

 heavy lines, whilst the outlines of the bones of which the carapace is 

 composed are represented by lighter lines. 



1. Nuchal plate. 2. First neural plate. 3. Second costal plate. 



4. Marginal plate. 5. Pygal plate. 6. Eib. 7. Thoracic vertebra. 

 8. First vertebral shield. 9. Costal shield. 



C. The Plastron of a Green Turtle, Chelone my das x |. (Camb. Mus.) 



1. Epiplastron (clavicle). 2. Entoplastron (interclavicle). 3. Hyoplastron 

 (cleithrum). 4. Hypoplastron. 5. Xiphiplastron. 



