. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 35. Lyrocephalus (?) from East Greenland. After Save-Soderbergh. The basisphenoid region remains unossified or at best only feebly ossified in specimens identified as trematosaurid, but enough ossifica- tion is occasionally present to show the existence of the canal and recess posterior to the pituitary which carried the "pituitary" inter- orbital vein and lodged eye musculature in Eryops. A braincase most recently described by Save-Soderberg (1944), but not identified taxonomically, shows most of the o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 35. Lyrocephalus (?) from East Greenland. After Save-Soderbergh. The basisphenoid region remains unossified or at best only feebly ossified in specimens identified as trematosaurid, but enough ossifica- tion is occasionally present to show the existence of the canal and recess posterior to the pituitary which carried the "pituitary" inter- orbital vein and lodged eye musculature in Eryops. A braincase most recently described by Save-Soderberg (1944), but not identified taxonomically, shows most of the outline of this opening. Postero-ventral to this opening we find in primitive temnospondyls and all anthracosaurs a stout projecting basipterygoid process received into a socket in the pterygoid and epipterygoid; this is one of the most important landmarks in the topography of the braincase. This process is still present in such typical rhachitomes as Eryops even though the joint is a fixed one. Save-Soderbergh has assumed that this process was reduced in trematosaurs to a slender connection between sphenethmoid and epipterygoid (1936, fig. 12, pbt, prh). It seems, however, that it was unquestionably present and typically developed here, although in cartilaginous rather than osseous form, as the "core" of the braincase-palatal articulation. AVe have noted the typical socket for its reception. Its position on the lateral surface. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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