RHYNCHOCEPHALIA. 



567 



finibriata, from Brazil and the Guianas, with warty growths of decep- 

 tive appearance. The aquatic terrapins of N. America belong to the 

 Jamily ChelydndEe, Chelydra, and Macrodemmys. 



Tnonychidse, fresh-water turtles, with depressed carapace covered 

 with soft skin, with webbed digits. Each foot has sharp claws on the 

 three inner digits. They are carnivorous in habit. Examples.— Trionyx 

 javanuus, T. gangeticus, T. niloticus, from Java, the Ganges, and the 

 .Nile respectively. 



RHYNCHOCEPHALIA. 



The only living representative of this "class" is the 

 New Zealand " Lizard " or Tuatara— Hatteria (Sphenodon) 



Fig. 246.— Lateral view of brain ot Haiteria punctata. 

 — After Osawa. 



1-12, Cranial nerves ; p.e., parietal eye ; k.g., pineal gland ; 0, optic 

 lobe ; c, cerebellum ; v., fourth ventricle ; in., infundibulum and 

 pituitary body. 



punctata. Lizard-like in appearance, it measures from one 

 to two feet in length, has a compressed crested tail, is dull 

 olive-green spotted with yellow above and whitish below. 

 It is now rare, but is preserved in some small islands off 

 the New Zealand coast. It lives in holes among the rocks 

 or in small burrows, feeds on small animals, and is nocturnal 

 in habit. 



The skull, unlike that of any lizard, has an ossified quadrato-jugal, 

 and therefore a complete infra-temporal arcade ; the quadrate is finnly 

 united to pterygoid, squamosal, and quadrato-jugal ; the pterygoids 

 meet the vomer and separate the palatines ; there are teeth on the 

 palatine in a single longitudinal row, parallel with those on maxilla and 

 mandible, and the three sets seem to wear one another away ; there is 



