. Carnegie Institution of Washington publication. SYSTEMATIC REVISION 55 This genus is known only from the cast of a cavity in the sandstone and so only the external form can be made out. It is evidently closely related to Pareia- sanrus, but has numerous prominent spines on the posterior edge of the skull, resembling in this regard the Pareiasaurians from Northern Russia. Genus SCLEROSAURUS H. v. Meyer. Sclerosaurus H. v. Meyer, Paleontographica, Bd. VII, pp. 35-4°, Taf. 6. Labyrlnthodon Wiedersheim, Abh. Schweiz. pal. Gesell. Bd. 5. Aristoiesmus Seeley, Proc. Roy. Soc, vol. 59, pp. 167-169.
. Carnegie Institution of Washington publication. SYSTEMATIC REVISION 55 This genus is known only from the cast of a cavity in the sandstone and so only the external form can be made out. It is evidently closely related to Pareia- sanrus, but has numerous prominent spines on the posterior edge of the skull, resembling in this regard the Pareiasaurians from Northern Russia. Genus SCLEROSAURUS H. v. Meyer. Sclerosaurus H. v. Meyer, Paleontographica, Bd. VII, pp. 35-4°, Taf. 6. Labyrlnthodon Wiedersheim, Abh. Schweiz. pal. Gesell. Bd. 5. Aristoiesmus Seeley, Proc. Roy. Soc, vol. 59, pp. 167-169. AristoJesmus Seeley, Quart. Journ. Geol. Soc, vol. 56, pp. 620-645. Sclerosaurus v. Huene, Geol. u. pal. Ablmdlg. n. b., Bd. VI, Heft I. The specimen was found in the Buntersandstein near Rheinfelden. Skull completely roofed over and the posterior bones carrying prominent spines, especially the squamosal, quadrate, and quadratojugal. Skull flatter than that of Elginia. Occipital condyle hemispherical, as in Pareiasaurus and Elginia. Von Huene figures large palatal vacuities in his reconstruction of the palate, but there seems no warrant for this in the specimen or from analogy with other Pareiasaurians. External nares, terminal and vertical. Seven blunt conical teeth preserved in the maxillary and four rather sharper ones in the premaxillary, but it is not certain that. Fig. 14.—Outline reconstruction of Sclerosaurus. After von Huene. this is the complete number. Surface of the skull smooth with the exception of the projections at the back of the skull. Seeley and Wiedersheim report twenty-two presacral vertebrae, v. Huene twenty-one. Vertebrae notochordal and shorter on the lower line than the upper, leaving spaces for intercentra; a sharp keel on the lower surface of the centrum gives it a triangular section. Neural spines short, with the upper ends expanded and rugose where they came in contact with the dorsal plates. Transverse processes strong and heavy with single arti
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