. A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New Jersey. Fishes, Fossil; Paleontology; Geology. ELASMCXBRANCHII. 99 Differs from Myliobatis in having- the teeth uniserial, very broad, and no small lateral ones. Upper dental lamina straight and lower lamina projecting" beyond upper, curved. Free hind edge of nasal valve deeply emarginated. A single existing species in tropical seas, and 13 extinct species have been described, the latter only known from dental plates. Aetobatus pErspicuus (Leidy). Aetobatis perspicuus Leidy, Proc. Acad. Nat.
. A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New Jersey. Fishes, Fossil; Paleontology; Geology. ELASMCXBRANCHII. 99 Differs from Myliobatis in having- the teeth uniserial, very broad, and no small lateral ones. Upper dental lamina straight and lower lamina projecting" beyond upper, curved. Free hind edge of nasal valve deeply emarginated. A single existing species in tropical seas, and 13 extinct species have been described, the latter only known from dental plates. Aetobatus pErspicuus (Leidy). Aetobatis perspicuus Leidy, Proc. Acad. Nat. Sci. Phila., 1855, p. 396. Mon- mouth Co., N. J. Eocene? JEtobatis perspicuus Leidy, Journ. Acad. Nat. Sci. Phila., (2) VIII, 1877, p. 2+4, PI. 31, fig. 13 (type). Median tooth of dental plate well arched or angxilar, turning abruptly upward at end of tooth. Enamel surface rather broad, flat, and end only slightly rounded. Greatest width or vertical diameter of enameled surface usually uniform, and about one- seventh in entire horizontal diameter. Anterior edge of tooth angularly convex greater part of its extent, feebly deflected for-. Fig. 52.—Aetobatus perspicuus (Leidy). (From Leidy.) ward laterally, and at end presents projection adapted to cres- centoid depression or socket of contiguous tooth. Posterior edge presents a narrow flang'e along greater portion of its length, and crescentoid socket at end of tooth adapted to receive projecting border of contiguous tooth. Root with laminae projecting poste- riorily about space equal to one-half vertical diameter of enameled surface, and all directed obliquely towards median axis of tooth. Length (width) about 60 mm. (From Leidy.) Formation and locality. Only the type known described above, from the Eocene of Monmouth County (J. L. Burtt), originally presented to the Academy, but which I have not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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