. Cope papers, 1871-[1897. Zoology; Paleontology. 216 B. NATUEAL HISTOET. If we now turn to the Rhynchocephalia, as represented by Sphe- nodon,* we find the exoccipital greatly prolonged laterally, and carrying with it the opisthotic. It is carried apparently beyond any connection with the prootic (alisphenoid of Gunther), but is less distant from the supraoccipital, or rather the epiotic (parocci- pital, Gunther), which is here, according to Gunther, not entirely separated from the supraoccipital, as in the Testudinata, though more so than in the latter. Its superior and anterior extent is re
. Cope papers, 1871-[1897. Zoology; Paleontology. 216 B. NATUEAL HISTOET. If we now turn to the Rhynchocephalia, as represented by Sphe- nodon,* we find the exoccipital greatly prolonged laterally, and carrying with it the opisthotic. It is carried apparently beyond any connection with the prootic (alisphenoid of Gunther), but is less distant from the supraoccipital, or rather the epiotic (parocci- pital, Gunther), which is here, according to Gunther, not entirely separated from the supraoccipital, as in the Testudinata, though more so than in the latter. Its superior and anterior extent is remarkable in this genus, forming a connection with the postorbi- tal above and the malar below, peculiarities not noticed in any other reptile. Superiorly it rises into the parieto-quadrate arch, which it forms with the squamosal, the parietal not entering it; another peculiarity, the only parallel to which is to be found in the Anomodontia, where this arch is however depressed into close con- tact with the occipital segment of the skull. The type exhibited by the LacertUia is intermediate between that of the last and that of the Tortoises, and serves to reconcile them. Here, also, the opisthotic is carried beyond connection with the other otic elements. In Igu- ana it contributes largely to the formation of the parieto-quadrate arch, but with the parietal instead of the squamosal, and on the under instead of the upper side, as in the genus Sphenodon. (See figs. 13, 14, OpO.) In Chamseleo it is a mere wedge articulating with the proximal end of the quadra- turn, and not entering into the parieto-quadrate arch. Ttux',. XxOc OcO\ Fig. 12. — Iguana tuberculata; pos terior arches 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 Cope, E. D. (Edward Drinker), 1840-1897. Philadelphia, etc.
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