BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 34. pp. 459-462 SEPTEMBER 30, 1923 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



COXTPtlBUTIOX TO THE VOMER-PARASPHEXOID 



QUESTIOX 1 



BY F. VOX HUEXE 



{Presented hefore the Paleontological Society Decemher 30, 1922) 



CONTEXTS 



Page 



Introduction 459 



Characters of ventral side of sl^ull 459 



Presentation of the important facts 460 



IXTRODUCTIOX 



Eecently I have examined a very perfect skull of Dicijnodon soUasi 

 (Broom), of the Upper Permian Endotliiodon beds from Biesje.spoort, 

 Cape Colony, South Africa,- which I had received as a kind donation 

 from Dr. E. Broom. One of the results which seems to me of importance 

 concerns the vomer question. 



Character of vextral Side of Skull 



The ventral side of this skull indicates the following characters : 

 The anterior portion of the basi-sphenoid possesses a long rostrum 

 directed obliquely upward and in a higher plane than any part of the 

 palate. The upper and posterior portion of it forms a thin and moder- 

 ately high median blade, which I take for the presphenoid. The thicker 

 and lower part of it, which extends to the anterior side of the orbits, I 

 regard as the parasphenoid. 



Below the branching of the rostrum basLsphenoidei the pterygoid 

 touches the basis cranii in the usual manner for a short distance un- 

 divided. It then separates anteriorly and thus forms a long and narrow 

 interpterygoidal space. The latter is surrounded posteriori v by the 



^ Manuscript received by the Secretary of the Society March l.o, 1923. 

 2 PaL Zeitschr., v, 1, 1922, pp. 58-71. 



(459) 



