. Brigham Young University science bulletin. Biology -- Periodicals. Brigham Young University Science Bulletin MENTAL FORAMINA PALATINE DENTARY PTERYGOID CORONOID-. -PREMAXILLA NASAL -PREFRONTAL -SUPERIOR LABIAL FORAMINA -MAXILLA ORBIT -FRONTAL -SUPRATEMPORAL FOSSA -SUBORBITAL FORAMINA -JUGAL POSTORBITAL --SQUAMOSAL PARIETAL INFRATEMPORAL FOSSA- EPIPTERYGOID SURANGULAR QUADRATE ARTICULAR RETROARTICULAR PROCESSJ ANT. SEMICIRCULAR CANAL- Fig. 3. Phrytwsoma platyrhinos platyrhinos. Lateral view of the skull. BYU 22816, 22823, 22813. X 5. occipital condylar divisions present in the im- mature liza
. Brigham Young University science bulletin. Biology -- Periodicals. Brigham Young University Science Bulletin MENTAL FORAMINA PALATINE DENTARY PTERYGOID CORONOID-. -PREMAXILLA NASAL -PREFRONTAL -SUPERIOR LABIAL FORAMINA -MAXILLA ORBIT -FRONTAL -SUPRATEMPORAL FOSSA -SUBORBITAL FORAMINA -JUGAL POSTORBITAL --SQUAMOSAL PARIETAL INFRATEMPORAL FOSSA- EPIPTERYGOID SURANGULAR QUADRATE ARTICULAR RETROARTICULAR PROCESSJ ANT. SEMICIRCULAR CANAL- Fig. 3. Phrytwsoma platyrhinos platyrhinos. Lateral view of the skull. BYU 22816, 22823, 22813. X 5. occipital condylar divisions present in the im- mature lizard. The basioccipital forms the ven- tromedial part of the occipital condyle and fuses posterodorsolaterally with the exoccipital, to form a single occipital condyle, and laterally with the opisthotic. On the anterolateral ventral surface, the basi- occipital forms the posterior majority of the two spheno-occipital tubercles. Articulation anterior- ly is with the basisphenoid. Supraoccipital (Fig. 2) borders the foramen magnum dorsally. The supraoccipital unites laterally with the opisthotic and ventrolaterally with the exoccipital. Dorsally, articulation is with the parietal. Note: In adults the supraoccipital, exoccipi- tal, and basioccipital are fused forming a single structure surrounding the foramen magnum. In juveniles some sutures can usually be seen which separate the several occipital bones and show distinctly the three embryonic condyles which form the single occipital condyle in adults. Exoccipital (Fig. 2) forms the lateral border of the foramen magnum. The paraoccipital pro- cess of the exoccipital projects from the mesial occipital laterally to articulate with the tabular. Occasionally the extreme lateroventral tip of the paraoccipital process lies next to the quadrate; however, in most cases the posteroventral part of the tabular lies between the paraoccipital pro- cess and the quadrate. The posterior part of the posterior, ventral semicircular canal is formed by
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