. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 374 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY figures drawn from reconstructed sections. Anteriorly the exoc- cipital ends at the great canal for the Xth nerve, and the basioc- cipital extends sufficiently far forward to come into contact with the lower end of the paroccipital just behind and below the great opening — the internal auditory meatus — into the cavity for the inner ear. The basisphenoid and the indistinguishably fused parasphenoid form an immensely more complicated bone. (This complex of two bones I shall
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 374 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY figures drawn from reconstructed sections. Anteriorly the exoc- cipital ends at the great canal for the Xth nerve, and the basioc- cipital extends sufficiently far forward to come into contact with the lower end of the paroccipital just behind and below the great opening — the internal auditory meatus — into the cavity for the inner ear. The basisphenoid and the indistinguishably fused parasphenoid form an immensely more complicated bone. (This complex of two bones I shall call basisphenoid in the rest of this paper.) The most visible part of it when seen from below is a huge sheet of bone which ends posteriorly in a free margin lying. Pro. Of. Qu. Fac St Foe ! ParOc. Pq^S Fig. 18. Dmdectes, isolated braincase seen from below. Composite (see Fig. 17) X %. Eeference letters as before with: , fenestra ovalis; , facet for articulation of the quadrate with the prootic; , basipterygoid process of the basisphenoid; , facet for the footplate of the stapes. considerably below the ventral surface of the basioccipital con- dyle and extending out to the fenestra ovalis. The whole surface may be continuous or it may be divided by a median groove into two well separated swellings. These lie below great excavations into which the anterior ends of the recti capitis muscles no doubt extended, the two spaces being apparently usually separated by a median septum anteriorly. Dorsal to these spaces lies the body of the bone, which fuses with the prootic in old individuals. 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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