AECHEGOSAURID^. 183 



Platyoposaurus stuckenbergi (Trautschold 1 ). 

 Syn. Platyops stuckenbergi, Trautschold 2 . 



Skull relatively longer than in Archecjosaurus decheni, its length 

 exceeding three times the width ; total length of skull about 0,456 

 (18 inches). Said to be distinguished from the typical Platyopo- 

 saurus (Platyops) rickardi (Twelvetrees 3 ) by the smaller number 

 and elliptical section of the teeth. 



Hah. Europe (Eussia). 



R. 694. Three fragments of sculptured bones ; from the Upper 

 Permian (Zechstein) of the Government of Perm. The 

 sculpture resembles that of the type skull figured by 

 Trautschold in the f Mem. Soc. Moscou,' vol. xv. pt. i. 

 pi. i. Purchased, 1886. 



Genus ACTINODON, Gaudry 4 . 



Skull (fig. 45) much shorter and wider than in Archecjosaurus, 

 with the orbits placed in the middle of the length, the nares large 

 and widely separated, the muzzle broad and rounded, the occipital 

 condyles ossified, and a number of denticules on the vomer and 



Fig. 44. 



Actinodon latirustris. — Thoracic buckler ; from the Rothliegendes (Lower 

 Permian) of Autun. Reduced, ent, medial plate ; cp, lateral plate ; 

 o, pectoral girdle. {After Gaudry.) 



large tusks in the palatines. Middle and lateral plates of thoracic 

 buckler (fig. 44) shorter, wider, and more curved than in Archego- 

 saurus. Tarsus fully ossified. The epiotic cornua are well developed, 



1 Mem. Soc. Moscou, vol. xv. pt. i. p. 10 (1884). — JPlatyops. 



2 Loc. cit. 3 Log cit. 



4 Kouv. Archiv. d. Museum, vol. iii. pp. 22. 23 1S67). 



