THEEOMORPHA 



181 



ends ; epicondylai' foramen not observed. Ulna very stout, with prominent 

 olecranon process. Pelvic bones massive, coossified ; acetabulum closed. 

 Hind limb slightly shorter than the fore, and digits rather smaller ; the five 

 ungual phalanges clawed. P. homUfrons, P. serridens, Owen ; P. haini, Seeley. 



? Tapinocephahhs, Anthodon, Owen. Karoo Formation ; South Africa. 



Elginia, Newton. Known only by the skull, which is about 15 cm. long, 

 triangular, coarsely sculptured, and provided with a number of paired bosses 

 and spinous or horn-like defences. These occur along the posterior and lateral 

 margins, and on the parietal, frontal, and nasal elem£nts. Teeth with slightly 

 constricted base and serrated crowns. Supposed Trias of Elgin, Scotland. 



Procolophon, Owen (Fig. 285). Skull about 5 cm. long, short and tri- 

 angular, not externally sculptured. Orbits greatly enlarged, and temporal 



prruK. 



Tttitx 



fJinoc. 



Fig. 285. 



Procolophoii trigoniceps, Owen. Karoo Formation (Permian or Trias) ; South Africa. Restoration of sli;ull 

 from superior (A), inferior (B), and lateral (C) aspects, also part of the pectoral arch, slightly reduced, ao, 

 Glenoid cavity for humerus; hs, Basisphenoid ; co, Coracoid ; ecpt, Ectopterygoid ; epco, ISpicoracoid ; /, 

 Frontal ; id, Interclavicle ; ipt, Interpterygoid vacuity ; j, Jugal ; I, Lachrymal ; Itf, Lateral temporal vacuity ; 

 md, Mandible ; mx, Maxilla ; na, Nasal ; nar, Anterior nares ; orb, Orbit ; p. Downward ectopterygoid process ; 

 pa. Parietal; pin, Pineal foramen; pZ, Palatine; piinx, Premaxilla ; prf, Prefrontal; pt, Pterygoid; ptna, Pos- 

 terior nares ; ptf, Postfrontal ; pto, Postorbital ; rjj, Quadrato-jugal ; 511, Quadrate ; st, Supratemporal or pro- 

 squamosal ; sq, Squamosal ; v. Vomer (from A. S. Woodward). 



arcade pierced by a slight vacuity. Teeth conical ; a series of minute teeth 

 present on vomer and pterygoids. Interclavicle T-shaped, with elongated 

 arms ; epicoracoid notched. Karoo Formation ; South Africa. 



Aristodes7nus, Seeley. Lower Trias; Switzerland. ? Phanerosaur'US,y.MQyev. 

 Permian ; Saxony. 



Family 2. Pariotichidae. Cope. 



Teeth in more than one series in one or both jaws, and with cylindric roots ; 

 vertebrae ossified. Permian. 



Otocoelus, Cope. Skull about 12 cm. long, externally sculptured, but 

 without bosses. Dorsal carapace consisting of a series of twelve or more 



