No. 2.] AM/A CALVA. 49 1 



to the suprapharyngobranchials of the branchial arches, and the 

 symplectic and the anterior process of the metapterygoid to the 

 infrapharyngobranchials. 



19. The interhyal, or stylohyal, is certainly the epal element 

 of its arch, or epihyal, and the quadrate probably the corre- 

 sponding element in its arch. 



