ANOMODONTIA. 



149 



found only in the Kai-oo Formation of South Africa, the tyj>e species 

 being P. trigoniceps (fig. 94). All the known specimens are fragmentary. 



Fio. 94. 



Procolophon trigoniceps ; restoration of skull from the superior (A), inferior (B), 

 and lateral (C) aspects, also part of the pectoral arch, slightly reduced. 

 Karoo Formation (Permian or Triassic) ; South Africa, ac., glenoid cavity 

 for humerus; 6s., basisphenoid; co., coracoid; ecpt., ectopterygoid ; ep.co., 

 epicoracoid; /.frontal; i.cl., interclavicle ; i.pt., interpterygoid vacuity; 

 j.jugal; I, lachrymal; /. t.f, lateral temporal vacuity; md., mandible; 

 ;#., maxilla; na., nasal; nar., anterior nares; orb., orbit; p, downward 

 ectopterygoid process; pa., parietal; pin., pineal foramen; pi., palatine; 

 pmx., premaxilla (with palatal extension in fig. B) ; prf., prefrontal; pt., 

 pterygoid ; pt. na., posterior nares ; ptf., postfrontal ; pto., postorbital ; 

 q.j., quadrato-jugal ; qu., quadrate; s. t., supratemporal (prosquamosal) ; 

 sq., squamosal; r, vomer. (From specimens in British Museum.) 



Aristodesmus ruetimeyeri (originally ascribed in error to 

 Labyrinthodori) seems to be related to Procolophon. It is 

 known only by the impression of a small skeleton from the 

 Bunter Sandstone (Lower Triassic) of the neighbourhood of 

 Basle, Switzerland. 



Otocoelus. A small animal remarkable for the possession of a bony 

 dorsal shield. The head is triangular in form, short, broad, and depressed. 

 The cranial roof is coarsely sculptured, but not ornamented with bosses; 



