. Brigham Young University science bulletin. Biology -- Periodicals. Osteology and Myology of Phrynosoma PREMAXILLA FENESTRA EXONARINA NASAL FRONTAL FRONTOPARIETAL SUTURE PINEAL FORAMEN PARIETAL INTEROCCIPITAL SPINE SUPRAOCCIPITAL. MAXILLA PREFRONTAL ECTOPTERYGOID SUPERCILIARY BAR SUPERCILIARY FOSSA JUGAL POSTORBITAL POSTORBITAL SPINE —V- SQUAMOSAL OCCIPITAL SPINE FIRST TEMPORAL SPINE Fig. 4. Phrynosoma douglassi hernandesi. Dorsal view of the skull. BYU 22815, 22817. X 4. semicircular canal. The prootic is fused posteri- orly with the opisthotic and articulates with the parietal dorsally and
. Brigham Young University science bulletin. Biology -- Periodicals. Osteology and Myology of Phrynosoma PREMAXILLA FENESTRA EXONARINA NASAL FRONTAL FRONTOPARIETAL SUTURE PINEAL FORAMEN PARIETAL INTEROCCIPITAL SPINE SUPRAOCCIPITAL. MAXILLA PREFRONTAL ECTOPTERYGOID SUPERCILIARY BAR SUPERCILIARY FOSSA JUGAL POSTORBITAL POSTORBITAL SPINE —V- SQUAMOSAL OCCIPITAL SPINE FIRST TEMPORAL SPINE Fig. 4. Phrynosoma douglassi hernandesi. Dorsal view of the skull. BYU 22815, 22817. X 4. semicircular canal. The prootic is fused posteri- orly with the opisthotic and articulates with the parietal dorsally and with the basisphenoid ventrally. The fenestra ovalis is located anterior and slightly ventral to the most medial part of the paraoccipital process and is formed anteriorly by the prootic and laterally by the opisthotic. Tabular (Fig. 2) is located anterior and be- tween the lateral paraoccipital process and die medial side of the posterior ventral projection of the squamosal. It articulates with the squamosal laterally, the opisthotic medioanteriorly and the parietal dorsally. Articulation is medially with the paraoccipital process and ventrally with the quadrate. The tabular can be observed by look- ing posteroventrolaterally through the supratem- poral fossa. The extreme posteroventral tip of the tabular can be observed by looking at die posterior aspect of the skull. The dp articulates with the quadrate and appears to be fused with the squamosal to the extent that it is barely visible. Quadrate (Figs. 2 and 3) is located anterior and ventral to the ventrally projecting part of the squamosal and articulates ventrally with the ar- ticular of the lower jaw to form the posteroven- trolateral angle of the skull. The quadrate is roughly triangular, witii the blunt apex joining ventrally with the articular. The medial and lateral sides of the quadrate are thickened and rounded (more so medially) and terminate dor- sally as the major portions of a condyle. The quadrate is trough-s
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