. Carnegie Institution of Washington publication. THE PERMIAN FISHES OF NORTH AMERICA 169 Megalichthys nitidus (Cope). (Plate 30, figs. 1-4; plate 31, figs. 3-35.) 1880. Ectosteorhachis nitidus Cope, Proc. Amer. Philos. Soc, xix, p. 56. 1888. Ectosteorhachis nitidus Cope, Trans. Amer. Philos. Soc, xvi, p. 286. 1891. Megalichthys nitidus (Cope), Proc. U. S. Nat. Mus., xiv, p. 457, pi. xxxii, figs. 8, 9. 1891. Megalichthys nitidus (Cope), Woodward, Cat. Fos. Fishes, Brit. Mus., 11, p. 388. 1899. Parabairachus nitidus (Cope), Hay, Amer. Nat., xxxiii, p. 788. Type: Head and trunk, including ventra
. Carnegie Institution of Washington publication. THE PERMIAN FISHES OF NORTH AMERICA 169 Megalichthys nitidus (Cope). (Plate 30, figs. 1-4; plate 31, figs. 3-35.) 1880. Ectosteorhachis nitidus Cope, Proc. Amer. Philos. Soc, xix, p. 56. 1888. Ectosteorhachis nitidus Cope, Trans. Amer. Philos. Soc, xvi, p. 286. 1891. Megalichthys nitidus (Cope), Proc. U. S. Nat. Mus., xiv, p. 457, pi. xxxii, figs. 8, 9. 1891. Megalichthys nitidus (Cope), Woodward, Cat. Fos. Fishes, Brit. Mus., 11, p. 388. 1899. Parabairachus nitidus (Cope), Hay, Amer. Nat., xxxiii, p. 788. Type: Head and trunk, including ventral fins, of a large fish. No. 7239 Am. Mus. Texas. Referred specimen: Cranium and some vertebra. No. 7936 Am. Mus. Archer County, Texas. The principal points in the specific diagnosis may be condensed from Cope's original description as follows: Original description: "Pectoral fins originate further behind the head than is usual. The ventrals are well posterior and close together. * * * The orbits are in front of a transverse line divid- ing the skull equally. The muzzle is broadly rounded, and is covered with rounded plates of ganoine. Several of these have median per- forations. * * * The top of the head behind the muzzle is entirely without ganoine layer in two specimens; its surface is smooth, or weakly finely ridged. On the other hand the premax- illary, maxillary, mandibular, and gular bones are invested with perfectly smooth ganoine. "The pectoral fins are quite wide, and their rays diverge exclusively from the inner border, and are very fine. The axial portion is thick and acuminate, and has no fulcra on the external edge, but is covered with quad- rate and rhomboidal scales, of very much smaller size than those of the body. The axial portion of the ventral fins is not quite so large as that of the pectoral. "The scales of the body are quite large and overlap each other by both the free edges. Though their form is rhombic, the apex is rounded. The surface
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