. Transactions of the American Philosophical Society. mall and is crowded by the adjacent elements. Its fusion with the post- * Which I owe to the Geological Survey of Cauada. f Including the supposed squamosal of my description of Diclonius {). t Amer. Jour. Sci. Arts., 1887, PI. VI. ^ See Eudes Deslongchamps Notes Paleoutologiqucs, 1803-9. IN THE REPTILIA. 19 orbital would be probable. The arch is then supratemporal, and this element maybe fused with the supramastoid in the Dinosauria. If the Rhtnchocephalia of the Mesozoic had the same structure as Spheno-don, we may ascribe to them an
. Transactions of the American Philosophical Society. mall and is crowded by the adjacent elements. Its fusion with the post- * Which I owe to the Geological Survey of Cauada. f Including the supposed squamosal of my description of Diclonius {). t Amer. Jour. Sci. Arts., 1887, PI. VI. ^ See Eudes Deslongchamps Notes Paleoutologiqucs, 1803-9. IN THE REPTILIA. 19 orbital would be probable. The arch is then supratemporal, and this element maybe fused with the supramastoid in the Dinosauria. If the Rhtnchocephalia of the Mesozoic had the same structure as Spheno-don, we may ascribe to them an infratemporal foramen and a zygomatic arch. Theformer is bounded above by a bar which consists anteriorly of the postorbital, andposteriorly, in all probability, of the supratemporal. Hence the postfrontal andsupramastoicl do not communicate as they do in the Ichthyopterygia; and the largeforamen above the superior bar has different boundaries below from that observed inIchthyosaurus, but is like that of the Anomodonta. Hence I call this foramen the.
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