1886.] 



445 



[Cope. 



Fig. 3, skull, from below. 

 Fig. 4, do. right half, from within. 

 Fig. 5, left mandibular ramus, external view. 



Figs. 6-9, an anterior dorsal vertebra ; fig. 6, front ; 7, rear ; 8, bottom ; 

 9, top. 



Plate VII. 



Chthonerpeton indistinctum K. and L. Three-eighths nat. size. After 

 Wiedersheim. From Brazil. 



Fig. 1, skull, from above. 



Fig. 2, do. from below. 



Fig. 3, do. left half, from within. 



Figs. 4-6, one and parts of two other vertebrae ; 4, from above ; 5, from 

 below ; 6, right side. 



EXPLANATIONS OF LETTERS. 



Pmx., Prernaxillary. 



Mx., Maxillary. 



Na., Nasal. 



Npr., Nasopremaxillary. 



Pef., Prefrontal. 



F., Frontal. 



P., Parietal. 



Tr., Temporal ridge. 



Sq., Squamosal. 



Exo., Exoccipital. 



ProO., Prootic. 



OS., Orbitosphenoid. 



Eth., Ethmoid. 



Par., Parasphenoid. 



VoPal., Vomeropalatine. 



PL, Pterygoid. 



Stp., Stapes. 



Q., Quadrate. 



Co., Occipital condyle. 

 Art., Articular. 

 Aug., Angular. 

 D., Dentary, 

 DL, Diapophysis. 

 Pez., Prezygapophysis. 

 Poz., Postzygapophysis. 

 Hy., Hypapophysis. 

 Hsp., Hypapophysial spine. 

 JYSp., Neural spine. 

 Ch., Posterior nares. 

 Ap., Anterior nares. 



a, Naso-palatal foramen. 



b, " 



c, " " " 

 Car., Carotid foramen. 

 Orb., Orbit. 



