. Transactions of the American Philosophical Society. y study of the skull of Lystrosaurus Copef (Proceeds. Araer. Sci., 1870, XIX, p. 205), I showed that this genus possesses an extensive supra- * Proceeds. Amer. Philos. Soc, 1884, p. 33. t Ptychognathus Oweu (preoccupied) ; Ptycliosiagou Lydekker, 1889. ? 16 POSTERIOR CRANIAL ARCHES temporal foramen, and that the bone which bounds it externally consists posteriorlyof the supratemporal bone, and not the zygomatic. Anteriorly this bone joins thepostorbital, postfrontal and malar. In the Transactions of the Royal Society for1889, p. 24
. Transactions of the American Philosophical Society. y study of the skull of Lystrosaurus Copef (Proceeds. Araer. Sci., 1870, XIX, p. 205), I showed that this genus possesses an extensive supra- * Proceeds. Amer. Philos. Soc, 1884, p. 33. t Ptychognathus Oweu (preoccupied) ; Ptycliosiagou Lydekker, 1889. ? 16 POSTERIOR CRANIAL ARCHES temporal foramen, and that the bone which bounds it externally consists posteriorlyof the supratemporal bone, and not the zygomatic. Anteriorly this bone joins thepostorbital, postfrontal and malar. In the Transactions of the Royal Society for1889, p. 244, Prof. H. G. Seeley analyzes the structure of the skull of Dicyno-don, which he shows to resemble closely that of Lystrosaurus, and his analysis of theposterior arch and foramen is the same as my own in the latter genus. It is evidentthen that the Anomodonta differ from the Theriodonta in the absence of a zygo-matic arch, and in the presence of a supratemporal arch, which is separated from theparietal bone by a supratemporal foramen (Figs. 1-2)..
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