ORDER I 



BHYXCHOCEPHALIA 



149 



Naosaurus, Cope (Fig. 239). Differs from the last in that the neural 

 spines bear transverse processes. Per- 

 mian ; Texas and Bohemia. 



Embolophorus, Theropleura, Archaeo- 

 bolus, Lysoropjhus, Cope. Permian ; 

 Texas. Stereorachis, Gaudry ; Calli- 

 brachion, Boule and Glengeaud. Per- 

 mian ; Autun, France. Known by im- 

 perfect remains apparently allied to 

 Dimefrodoii. 



Sub-Order 3. 

 RHYNCHOCEPHALIA VERA. 



Abdominal ribs reduced to three relatively 

 large longitudinal series ; pubis and ischium 

 well ossified; fifth metatarsal very much 

 shortened, and somewhat expanded. Mar- 

 ginal teeth in one or more uniform series. . 



Fin. 24 J. 



Hyperodapedon gordoni, Huxley. Upper Trias; 



Elgin, Scotland. A, Superior aspect of skull, ' ; . 

 B, Palate. C, Mandibular symphysis from below. 



". Orbit; md, .Mandibular fork; mx, Maxilla; //. 

 Nasal ; }J, Palatine ; pmx, Premaxilla ; s, Supra 



Fig. 239. 



Naosaurus claviger, Cope. Permian; Texas. 

 Dorsal vertebrae, anterior and lateral aspects, J 4 

 (after Cope). 



Family 1. Rhynchosauridae. 



Skull short and broad, with a beak-like 

 rostrum formed in/ the downwardly curved, 

 slender, toothless premaxillae. Mandibles 

 with a single, and maxillae and palatines 

 with several longitudinal series of depressed 



temporal vacuity; s', Lateral temporal vacuity), COnicdl teeth. External /tares COnfhlmf. 

 (after Huxley). •> 



Trias. 



Hyperodapedon, Huxley (Fig. 240). Body stout, upwards of 2 m. long. 



