2I 4 



THE SKULL. 



[CHAP. 



plate from the palatine, incloses a large cavity, open only 

 behind, which contains the post-palatine air sinus. The 



fer 



"J 



FVa: 



FIG. 66. Under surface of the cranium of a young Dolphin {Globicefihalits inelas). \. 

 BO basioccipital ; ExO exoccipital ; Per posterior (mastoid) process of periotic ; 

 Ty tympanic ; Sq squamosal ; AS alisphenoid ; OS orbitosphenoid ; ZM zygo- 

 matic process of malar ; Fr supraorbital process of frontal ; Ma. body of malar ; 

 Pt pterygoid ; PI palatine ; MX maxilla ; PI\lx premaxilla ; Vo vomer ; gf 

 glenoid fossa of squamosal ; tg deep groove on squamosal for meatus auditorium 

 externus, leading to tympanic cavity ; cf condylar foramen. 



vomer ( Vo) is of great size, extends forwards nearly to the 

 apex of the rostrum, embracing the mesethmoid cartilage, 



