. Revision of the Amphibia and Pisces of the Permian of North America. zleof this specimen is broken off a short distance anterior to the orbits. Dimensions. mm Width at quadrates 56 Width at quadratojugals 74 Width between orbits 20 Width between tabular processes 25 Diameter of orbit 10 Revised description: This poorly preserved fragment shows only that por-tion of the skull posterior to the orbits, and is covered with a hard orbits are in the same relative position as in Zatrachys serratus. Theposterior ends of the tabulare are broken off and so the length can not begiven. There
. Revision of the Amphibia and Pisces of the Permian of North America. zleof this specimen is broken off a short distance anterior to the orbits. Dimensions. mm Width at quadrates 56 Width at quadratojugals 74 Width between orbits 20 Width between tabular processes 25 Diameter of orbit 10 Revised description: This poorly preserved fragment shows only that por-tion of the skull posterior to the orbits, and is covered with a hard orbits are in the same relative position as in Zatrachys serratus. Theposterior ends of the tabulare are broken off and so the length can not begiven. There is a deep emargination of the posterior separating off thequadratojugal; this is apparently natural, but the condition of the specimenmakes it impossible to determine whether the bones have been broken or not. The species is indeterminate and must remain doubtful until furtherinformation is gained by discovery. Zatrachys apicalis Cope. (See Aspidosaurus apicalis Cope, page 6;.)Zatrachys crucifer Case. (See Aspidosaurus eruciftr Case, page 66.) SYSTEMATIC REVISION 51. Fig. 9. A. T. Uxensis. No. 4719 Am. Mus. X i. B. Restoration of skull. Lettering as usual. XK. Genus TERSOMIUS texensis Am. Mus. Nat. Hist., vol. xxviii, Art. xvii, 1910, p. 180. Type: A skull. No. 4719 Am. Mus. Nat. Hist. From Texas. Original descri-ption: The skull is flattened, having nowhere near somuch of an arch as in the specimendescribed by Cope as Trimerorhachisconangulus. The orbits are large,extending so close to the edge thatthere is a very thin maxillary nares are small and look almostdirectly upward. The teeth are smalland sharply conical with no enlargedones visible in the maxillary or themandible. The position and relationsof the various bones are shown in thefigure. There is no tabulare visibleand it is probable that it was notpresent. Compared with Trimero-rhachis conangulus, which it most resembles, there is no second prosquamosal(intertemporale) and the orbit
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