. Carnegie Institution of Washington publication. THE PERMIAN FISHES OF NORTH AMERICA I7I It was at once pointed out by Newberry that the material representing this genus was "too imperfect for satisfactory study" and that it represented an amphibian and not a fish.* In 187s Cope emended his description, published a figure of the type, and gave his grounds for regarding the species as fish and not A AaA. Fig. 54.—SphceroUpis arctata (Cope). X 2. A. Fragment of a palatal (.') plate, bearing denticles. No. 7932 Am. Mus. B. Fragment of mandible or maxilla, bearing relatively
. Carnegie Institution of Washington publication. THE PERMIAN FISHES OF NORTH AMERICA I7I It was at once pointed out by Newberry that the material representing this genus was "too imperfect for satisfactory study" and that it represented an amphibian and not a fish.* In 187s Cope emended his description, published a figure of the type, and gave his grounds for regarding the species as fish and not A AaA. Fig. 54.—SphceroUpis arctata (Cope). X 2. A. Fragment of a palatal (.') plate, bearing denticles. No. 7932 Am. Mus. B. Fragment of mandible or maxilla, bearing relatively large conical, partly striated teeth. C. Specimen shown in A, in side view. But it is evident, on even little study, that neither his figure nor his diag- nosis offers any distinctive characters by which one could recognize this genus in a lot of material. Some of the characters he enumerated were undoubtedly derived from a specimen of Coelacanthus which, as appears from his figures, had become mixed up with his type specimen.! For these reasons Peplorhina is to be looked upon as an insufficiently defined genus, and Sphcerolepis Fritsch should be substituted. Sphserolepis arctata (Cope). (Plate 31, figs. i-2a, text fig. 54.) 1877. Peplorhina arctata Cope, Proc. Amer. Philos. Soc, p. 54. 1882. Theromorphus saurian Cope, Proc. Amer. Philos. Soc, p. 461, footnote. 1891. Peplorhina arctata Cope, Woodward, Cat. Fos. Fishes, 11, p. 408. 1900. Peplorhina arctata Cope, Case, Journ. Geol., vm, p. 707. Type: A fragmentary dentigerous plate. No. 6511 University of Chi- cago. Vermilion County, Illinois. Referred specimens: 1. A small symmetrical element bearing similar teeth and from the same locality as the type. No. 6512 University of Chicago. 2. A fragment of a larger palatal (?) plate than either of the two preceding specimens, bearing similar teeth. Texas. Collected by Dr. E. C. Case. No. 7932 American Museum. 3. A small fragment of a mandible or maxilla bearing relatively large co
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