386 H. L. KESTEVEN. 



goid processes of the basisphenoid in front and with the 

 basitympanic portion of the pterygoid laterally. The 

 parotic process [12] and the overhanging posterior margin 

 of the squamosal (Sq.), stand out behind the suspensory 

 ramus of the quadrate [11]. 



Posterior view.— The crest of the supraoccipital [14] 

 stands back well beyond the general plane of this aspect 

 of the skull. The exoccipitals (Ex. Oc.) articulating with 

 the supraoccipital above, meet in the mid line below along 

 the length of the condyle, diverging to expose the basi- 

 occipital within the foramen magnum. By its parotic 

 ramus [66] each exoccipital articulates with the opisthotic 

 (Op.), and this articulates laterally with the squamosal 

 above, and the otic ramus [16] of the quadrate below. The 

 paroccipital ramus [17 J of each exoccipital enters into the 

 formation of the paroccipital process, articulating here 

 with tin; pterygoid l;it«-rally and the basioccipital inferiorly. 

 The condylar rami [18] of the same bones lie above the 

 ramus of the same name of the basioccipital [19]. Looking 

 in and back through the orbit, (Fig. 50) the alisphenoid 

 plate [20] of the parietal may be seen articulating with the 

 epipterygoid process [21] of the pterygoid. Further back 

 the prootic (Pro.) is visible fitted in between supraoccipital 

 above, opisthotic behind, quadrate laterally and prootic 

 process [22] of pterygoid in front. Between the epiptery- 

 goid processes of the pterygoids, the rostrum of the basi- 

 sphenoid is visible [23], and articulating with these same 

 processes above the pedicle of the quadrate [24] is the 

 epipterygoid bone (Ept.). 



(B) Regions in detail. 



The Nasal Cavity (eavum nasi) and posterior nasal pas- 

 sages (meati ehoanarum). The perinasal bones are [1] 

 premaxillae forming the major portion of the floor of the 

 cavity, as well as by their nasal laminae the only part of 



