GREGORY: FISH SKULLS 



241 



maxilla. A third process of the premaxilla is a thin broad low crest on the medial dorsal 

 border of the bone; this crest is called by AUis the postmaxillary process of the premaxilla. 

 It prevents lateral dislocation of the premaxilla with reference to the maxilla. 



The maxilla rests in a groove on the postero-lateral face of the premaxilla and is ex- 

 cluded from the gape by the latter. Its narrow proximal end bears a prominent notch. 

 The rounded inner fork slides on the vomer; it carries the ascending process of the premaxilla 

 on its dorso-anterior surface. The outer fork overlaps the articular process of the pre- 

 maxilla below and joins the inner fork dorsally where both together end in a smooth convex 



/Ttfl prn>- 



Scorpaena scroia 



Fig. 116. Connections of the prema.xillse and maxillae with the rostral cartilage and the skull in a percomorph {Scorp<r»a 

 scroja). (After Allis.) A. Side view. B. Top view. 



