. Carnegie Institution of Washington publication. THE MICROSAURIAN FAMILY STEGOPID^. 113 quite distinct, in spite of Jacket's protestations to the contrary. The genus Stegops stands alone among the Carboniferous Amphibia of North America, so far as I am aware, in the possession of a well-defined lacrimal of the labyrinthodont type. Stegops divaricata Cope. COPE, Proc. Am. Phil. Soc., xxn, p. 406, 1885 (Keraterpeton diiiaricattim). MOODIE, Jour. Geol., xvn, No. I, p. 79, fig. 22, 1909 (Stegops). The Type: Specimen No. 2559 G, American Museum of Natural History, obverse of this is No. 12,311, Wa
. Carnegie Institution of Washington publication. THE MICROSAURIAN FAMILY STEGOPID^. 113 quite distinct, in spite of Jacket's protestations to the contrary. The genus Stegops stands alone among the Carboniferous Amphibia of North America, so far as I am aware, in the possession of a well-defined lacrimal of the labyrinthodont type. Stegops divaricata Cope. COPE, Proc. Am. Phil. Soc., xxn, p. 406, 1885 (Keraterpeton diiiaricattim). MOODIE, Jour. Geol., xvn, No. I, p. 79, fig. 22, 1909 (Stegops). The Type: Specimen No. 2559 G, American Museum of Natural History, obverse of this is No. 12,311, Walker Museum, University of Chicago. Horizon and locality: Linton, Ohio, Coal Measures. The skull on which this species is based consists of the impressions on two slabs of coal, one belonging to the Newberry Collection of the American Museum of Natural History, No. 2559 G, and the other to the Gurley Collection of the Uni- versity of Chicago, No. 12,311. The slab be- longing to the University of Chicago contains the better-preserved remains, so that the descrip- tion is based largely on that portion (plate 25, fig- 3)- Nearly all of the elements of the skull are determined with considerable certainty and many important characters in the morphology of the Microsauria are thus brought out. The skull is oval, elongate, truncate behind, and the quadrate angles project into sharp horns. The orbits are elongate ovals and their center lies in the median line which divides the skull transversely. The nostrils are elongate and have an oblique position. The pineal fora- men lies in the posterior third of the skull. FlG elements aTstogop, divaricata Teeth are preserved on both maxillae and pre- maxillae. They are simply sharp pleurodont denticles, and seem to have been fairly abun- dant. The bones have been completely carbon- ized and nothing of the original texture is preserved, although the details of the structure are beautifully preserved. (Plate 25, fig. 3.) The skull is so
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