26 GUIDE TO THE FOSSIL REPTILES, AMPHIBIANS, FISHES. 
Wall-ease 
9. 
Table-ease 
14. 
Order V.- RHYNCHOCEPHALIA. 
The little lizard-shaped Tuatera (Hcdteria or Sphenodon), 
now living on islands off the coast of h T ew Zealand, is the 
sole survivor of an important group of reptiles which first 
Fig. 22.— Skull and mandible of Hyperodapedon gordoni; upper view (a), 
right side-view (b), and mandibular symphysis from below (c), from 
the Triassic of Elgin; one-quarter nat. size. d. dentary; /. frontal; 
j. jugal; l.t.f. lateral temporal fossa; na. nasal; nar. nostril; orb. 
orbit; pa. parietal; pmx. premaxilla; prf. prefrontal; ptf. post¬ 
frontal; pto. postorbital; s.t.f. supratemporal fossa. (After A. S. 
Woodward. Wall-case 9.) 
appeared in the Permian period, had a wide distribution in 
the Triassic period, and still existed both in Europe and 
North America at least as late as the deposition of the Chalk. 
These reptiles closely resemble some of the Triassic Thero- 
podous Dinosauria, hut their teeth are not fixed in sockets and 
