. Carnegie Institution of Washington publication. . Fig. 32. A. Upper Burfacc of skull of Chilonyx rapidens. Sutures according to the author. X J. No. 4357 Am. Mus. n, nasal; mx, maxillary; /, frontal; pf, prefrontal; ptf, postfrontal; po, postorbital; p, parietal; sq, squamosal; qj, quadratojugal; ep, tabulare; so, supraoccipital plates. B. Restoration of skull of Chilonyx, upper view. After Cope, pmx, premaxillary; n, nasal; mx, maxillary; ptf, prefrontal; pof, postfrontal; /, frontal; /', jugal; z, zygomatic; p, parietal; sm, squamosal; s/,prosquamosal; int, tabulare. C Restoration of skull
. Carnegie Institution of Washington publication. . Fig. 32. A. Upper Burfacc of skull of Chilonyx rapidens. Sutures according to the author. X J. No. 4357 Am. Mus. n, nasal; mx, maxillary; /, frontal; pf, prefrontal; ptf, postfrontal; po, postorbital; p, parietal; sq, squamosal; qj, quadratojugal; ep, tabulare; so, supraoccipital plates. B. Restoration of skull of Chilonyx, upper view. After Cope, pmx, premaxillary; n, nasal; mx, maxillary; ptf, prefrontal; pof, postfrontal; /, frontal; /', jugal; z, zygomatic; p, parietal; sm, squamosal; s/,prosquamosal; int, tabulare. C Restoration of skull of Chilonyx, lateral Tiew. After Cope, pmx, premaxillary; mx, maxillary; n, nasal; /, lachrymal; pef, prefrontal; /, frontal; pob, postorbital; pof, postfrontal: sm, squamosal; si, prosquamosal; int, tabulare; x, zygo- matic! q, quadrate. the same force which led to the development of spines in Naosaurus and Dimetro- don^nd to similar extravagances in the Amphibia of the same beds. We have here a glimpse of overspecialization among the Diadectids, perhaps presaging their extinction. In the original description of the genus (25) Cope writes as follows: "The condition of the specimen is such that the composition of the skull may be readily made out. The postfrontal bones are large, and form the superior border of the orbit. At the front of the orbit they reach the prefrontal, thus excluding the frontal. The parietal bones are wider than the frontals, and are bounded laterally by the postfrontals and the squamosals and by an element between the squamosal and exoccipital, which occupies the position of the intercalare of the Stegocephah. Below this bone, on the inner side of the suspensorium, is the probable prootic. The squamosal, or an element which I can not distinguish from that bone, extends to the condyle of the quadrate, concealing that bone from external view. The. Please note that these images are extracted from scanned page images that may have been digitally enhanc
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1911
