. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 11. Lateral view of posterior skull region of a, Dinilysia patagonica, X ; b, Anilius scytale, MCZ 17645, X ; c, Cylindrophis maculatus, MCZ 34885, X ; d, Python molurus, MCZ 4278, X ; e, Lanthanotus borneensis, MCZ 8305, X Abbreviations on p. 62. Semidiagrammatic. laterally. In snakes (cf. Baird, 1960), the fenestra ovalis (partly) and fenestra ro- tunda (wholly) are enclosed and almost walled off from view by a crista circum- fencstralis, except in Anilius and Cylindro- phis, in which the cri
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 11. Lateral view of posterior skull region of a, Dinilysia patagonica, X ; b, Anilius scytale, MCZ 17645, X ; c, Cylindrophis maculatus, MCZ 34885, X ; d, Python molurus, MCZ 4278, X ; e, Lanthanotus borneensis, MCZ 8305, X Abbreviations on p. 62. Semidiagrammatic. laterally. In snakes (cf. Baird, 1960), the fenestra ovalis (partly) and fenestra ro- tunda (wholly) are enclosed and almost walled off from view by a crista circum- fencstralis, except in Anilius and Cylindro- phis, in which the crista is not prominent and the stapedial footplate relatively large. The crista circumfenestralis of snakes appears to correspond to the crista tuber- alis of lizards (Save-Soderbergh, 1947: 512; see also Oelrich, 1956: 1-17). The latter crista begins at the root of the paroccipital process and extends ventrally to the spheno- occipital tubercle (Oelrich), forming a pos- terior wall for the fenestra rotunda. The snake condition can be derived from that of lizards by the growth forward and up- ward of the crista tuberalis until the fenes- tra rotunda is deeply concealed at the base of the crista, which then partly occludes the fenestra ovalis and encloses the stape- dial footplate. The crista tuberalis in Dini- lysia does not fully enclose the stapedial footplate and the fenestra rotunda is thus widely open as in Anilius, Cylindrophis, and lizards, but the fenestra rotunda is strikingly low on the occiput (below, in- stead of on the level of the condyle), a condition not found in the lizards and a fortiori not in snakes (Fig. 12).. 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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