. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 204 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 5. Struthiocephalus whaitsi 12049 X £. Parasagittal view of the skull. Drawn directly from the exposed surface of the internal bones. The occiput, roof-bones and quadrate and lateral ramus of the pterygoid seen in section. formed by the parasphenoidal rostrum. A step is formed at this contact and a little higher up there is another step running nearly parallel. This recessed strip of bone may represent a distinct ossification—a presphenoid?—and it c
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 204 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 5. Struthiocephalus whaitsi 12049 X £. Parasagittal view of the skull. Drawn directly from the exposed surface of the internal bones. The occiput, roof-bones and quadrate and lateral ramus of the pterygoid seen in section. formed by the parasphenoidal rostrum. A step is formed at this contact and a little higher up there is another step running nearly parallel. This recessed strip of bone may represent a distinct ossification—a presphenoid?—and it continues the median septum ventrally composed of the parasphenoid. Higher up the sphenoid complex begins an outward convexity but this still forms part of the median septum. Still further up the convexity curves round the olfactory tract. Anteriorly this outward bulge forms a sharp edge which dorsally bounds the opening from which the olfactory tract emerges and ventrally forms the limit of the recess in which the posterior part of the olfactory bulb is housed. Here a median septum separates the two olfactory bulbs. In the posterior half of the sphenoid complex there appears to be a suture. Posterior to this suture the sphenoidal complex is pierced by two foramina. The lower one I believe to be for the optic nerve (II) and the upper one for the trochlearis (IV). This part of the complex I have labelled as the orbitosphenoid and the rest is a septosphenoid. Above the opening from which the olfactory tract emerges there is a small recess in the frontal bone which may have housed an accessory olfactory Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
Size: 1714px × 1458px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
