366 THE AMERICAN NATURALIST [Vol. XLII 



vary. Anterior to the orbit there are the prefrontal, the 

 lachrymal, the maxilla, and lateral to the orbit lies the 

 jugal. Posterior to the orbit lie the postorbital, the post- 

 frontal, the squamosal, the supratemporal, the opiotic, 

 and on the postero-lateral border of the skull lie the 

 quadrato-jugal and quadrate. 



In the skull of the modern Caudata we find an arrange- 

 ment of the elements which is quite similar to that de- 

 scribed for the Branchiosauria. In the skull of Megalo- 

 batrachus (Fig. 10), for instance, we find the following 



