On the Anatomy and Phylogenetic Position of Polypterus. All 



process from the epiotic and the suture is some distance from the 

 surface. 



On comparison with Polypterus it will be seen that the relation 



Woodcut 3. 



Woodcut 4. 



Woodcut 5. 



Woodcut 3. Back of skull of Mastodonsaurus from Eberhard Fraas. 



Woodcut 4. Back of skull of Cyclotosaurus from Fkaas. 



Woodcut 5. Back of skull of Polyptei-us very diagrammatic. 



1 Supraoccipital (dermal) or supratemporal (piscine), 2 Epiotic or posttemporal scale, 

 * Ossified ligament to opistliotic in Cyclotosaurus and Polypterus, 3 Occipitale laterale or 

 exoccipital, 4 Exoccipitale laterale or opistliotic, 5 Supratemporal (stegocephalan), squa- 

 mosal (reptilian) or operculum, 6 Vagus foramen, 7 Foramen magnum, 8 Supraclavicle 

 (dermal) of Polypterus, 9 Pharyngobrauchialis 1, + Squamosal process. 



