. Carnegie Institution of Washington publication. 174 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA This Species is inadequately known, having been described from exceed- ingly fragmentary material. The scales agree most nearly, in size and orna- mentation, with those of Platysomus and the species may provisionally be left in that genus. In Benedenius the scales are not nearly so deep. In the few scales in which the external ornamented layer is preserved, it is seen that the ornament agrees well with that of Platysomus, consisting of very fine, parallel, slightly undulating lines, crossi
. Carnegie Institution of Washington publication. 174 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA This Species is inadequately known, having been described from exceed- ingly fragmentary material. The scales agree most nearly, in size and orna- mentation, with those of Platysomus and the species may provisionally be left in that genus. In Benedenius the scales are not nearly so deep. In the few scales in which the external ornamented layer is preserved, it is seen that the ornament agrees well with that of Platysomus, consisting of very fine, parallel, slightly undulating lines, crossing the scale at a slight angle to its vertical axis (plate 30, fig. 7). The flank scales have a depth of about three times their width. Cope's original description may here be quoted. Original description of species: "The scale-series tend slightly backward from the vertical below, without distinct curvature. The scales on the sides in front are about five times as deep as long, and they graduate in size. Fig. 56.—Platysomus palmaris Cope. A. Imperfect fish in a nodule, natural size. No. 7935 Am. Mus. Texas. B. Scales, Ai natural size. One of the fragments representing the type specimen. Mus. Texas. No. 7281 to the lowest undivided row, where they are about twice as deep as long. The small scales of the inferior row are twice as deep as long, and their depth is about half that of the scales of the next series above them. The sculpture of the scales consists of narrow vertical ridges, which are curved slightly backwards below. About ten may be counted, crossing a trans- verse bone on each scale. Each of the narrow scales of the inferior row possesses a median angular keel which extends from the anterior edge downwards and backwards, but which does not reach the posterior edge of the scale. The external face of the clavicle is vertically striate like the scales, and horizontally striate on the recurved portion. The interclavicle has more distinct longitudinal ridges, and o
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