. Transactions of the American Philosophical Society. Fig. 1. Fig. 2. Fig. 1. Lystrosaurus frontosus Cope. Aa Anomodont from South Africa ; skull from above. Fig 2, do., fromright side. The lower Sq is the supratemporal. The South African genus Procolophon Ow. has been analyzed by Seeley* inan admirable manner. The orbit is greatly enlarged, so that the region of the bars iscontracted. However, there is a zygomatic arch, an infratemporal foramen, and nosupratemporal foramen, thus agreeing with the Theriodonta, and not with theAnomodonta. In conclusion it appears that there are four types of cr
. Transactions of the American Philosophical Society. Fig. 1. Fig. 2. Fig. 1. Lystrosaurus frontosus Cope. Aa Anomodont from South Africa ; skull from above. Fig 2, do., fromright side. The lower Sq is the supratemporal. The South African genus Procolophon Ow. has been analyzed by Seeley* inan admirable manner. The orbit is greatly enlarged, so that the region of the bars iscontracted. However, there is a zygomatic arch, an infratemporal foramen, and nosupratemporal foramen, thus agreeing with the Theriodonta, and not with theAnomodonta. In conclusion it appears that there are four types of crania represented in thePermian Reptilia, which are distinguished as follows: Temporal roof uninterrupted Cotylosuuria. A zygomatic arcli, but no distinct supratemporal or supramastoid arches Tlieriodonta. Zygomatic and supratemporal arches Diopeus. No zygomatic ; a supratemporal arch Anomodonta. *Philos. Trans. Roy. Soc, 1889, p. 3G9. IN THE REPTILIA. 17 II. The Mesozoic Reptilta. We may now examine how far the cranial types above described continue
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