XIII 



PHYLUM CHORDATA 



317 



Hatteria, the New Zealand Tuatara (Fig. 923), the only living 

 representative of the Rhynchocephalia, is a Lizard-like Reptile with 

 a well-developed laterally-compressed tail, and pentadactyle ex- 



FIG. 923. Hatteria punctata. (After Brehm.) 



tremities, very similar to those of a typical Lizard. The upper 

 surface is covered with small granular scales, and a crest of com- 

 pressed spine-like scales runs along the middle of the dorsal 

 surface. The lower surface is covered with transverse rows of large 

 squarish plates. 



FIG. 924. Grecian Tortoise (Testudo grfeca). (After Brehm.) 



In the Chelonia (Fig. 924) the body is short and broad, enclosed 

 in a hard " shell ' consisting of a dorsal part or carapace, and a 

 ventral part or plastron. These are firmly united, apertures being 



