. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASICRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 209 the braincase to immobility. In figure 8B the basioccipital-parabasisphcnoidal complex is shown dis- articulated. In figure 8C the disarticulated complex is shown in lateral view. Points of interest are: the large sella turcica is a pit in the basisphenoid, with the anterior face probably formed by the presphenoid; the parasphenoidal rostrum forms a septum directed antero-dorsally; the original basipterygoid process is indicated in br
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASICRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 209 the braincase to immobility. In figure 8B the basioccipital-parabasisphcnoidal complex is shown dis- articulated. In figure 8C the disarticulated complex is shown in lateral view. Points of interest are: the large sella turcica is a pit in the basisphenoid, with the anterior face probably formed by the presphenoid; the parasphenoidal rostrum forms a septum directed antero-dorsally; the original basipterygoid process is indicated in broken lines forming an immovable sutural face for both the epi- pterygoid and the pterygoid. The position of the fenestra ovalis is shown in black. This fenestra leads into the opisthotic in which the inner ear lies. 12062 Struthiocephalus sp. (Fig. 9) From a number of longitudinal sections cut through the posterior part of a poor skull I have reconstructed a section in a plane just lateral of the median plane to show, in particular, the olfactory tract in longitudinal section and the canal for the internal carotid. An unossified zone is present in the anterior part of the basioccipital. The parietal tube is 97 mm in length with average diameters 23 x 26 mm. 12091 Struthiocephalus sp. (Fig. 10) Cross-sections of the olfactory and pineal regions 1. The anterior end of the sphenoidal complex consisting of a septo- sphenoid is seen to be wedged in between the frontals. Laterally there is a deep groove in the under surface of the frontal which appa- rently housed a large olfactory bulb. 2. A sharp wedge of the septosphenoid is dorsally intercalated between the frontals. Laterally the septosphenoid develops a lateral flange forming a groove to hold the olfactory bulb. 3. Further back the wings composed of the orbitosphenoids enclose the olfactory tracts which are dumbbell- shaped in cross-section. 4. Still further back the upper part of the median septum is lost and the
Size: 1483px × 1684px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
