62 



NEW REPTILES AND STEGOCEPHALIANS FROM 



The exact outline of the nasals is not determinable. The anterior end appears to 

 be opposite a point halfway between the anterior end of the maxillaries and the anterior 

 end of the antorbital vacuity. The bone is marked by a deep radiating sculpture which 

 apparently starts from the region around the external nares, but is more pronounced 

 on the sides of the bone. The eminence of the nose is 2 or 3 centimeters anterior to the 



FIG. 25. Leptostichus crosbiensis, No. 7522, U. of Mich. X 0.16. 

 A. Lateral view of skull. B. Upper view of skull. C. Lower view of skull. 



Lettering as usual. 



external nares, and from this point the front slopes gently down to join the premaxillaries. 

 The lower edge of the nasals is excluded from the upper edge of the antorbital vacuity 

 by the juncture of the maxillary and the lachrymal. 



It is impossible to determine the exact outline of the septomaxillaries. It is evident 

 from the direction of the bone-fibers that a distinct element is present in front of the 

 nares, perhaps taking part in their anterior edge, but the sutures have not been made 

 out with certainty. 



The juyals articulate with the maxillaries by a broad sutural surface which underlies 

 the posterior end of the maxillary. A broad vertical process rises to articulate with the 

 postorbital and a relatively slender bar extends backward to articulate with the quad- 

 ratojugal and the quadrate. The articulation with the quadratojugal is as described 

 previously by the author. 1 The quadratojugal is deeply cleft on the lower edge and 



1 Case, E. C., Journal of Geology, vol. xxvm, p. 530-531, 1920. 



