RHYNCHOCEPHALIA 



685 



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

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

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

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



Fig. 395. — Sphenodon punctatus. The New Zealand " Lizard." 

 — From a Specimen. The only living representative of the 

 Rhynchocephalia. 



p 10 



Fig. 396. — Lateral view of brain of Sphenodon punctatus. 



— After Osawa. -> 



1-12, Cranial nerves ; p.e., parietal eye ; hg., epiphysis ; 0., optic 

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

 and pituitary body. 



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 also a single tooth on each side of a kind of beak formed by 

 the prema-xillaj ; the nares are divided. 



The vertebrae are amphiccelous or biconcave, as in geckos among 

 lizards and in many extinct Reptiles. Some of the ribs bear uncinate 



