Archive image from page 213 of A description of the fossil. A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New Jersey descriptionoffos00fowl Year: 1911 i68 CRETACEOUS AND TERTIARY FISH. Tooth with crown compressed, elongate, acuminate, with entire keel extending along each edge to base, and transverse section elliptical. Enamel of crown smooth. Root about equal in length to crown, conic continuation of crown apparently, and below hol- low. Length 28 mm. Formation and locality. Originally from the Cretaceous Fig. 103.—Ischyrhiza mira Leidy. Hadd
Archive image from page 213 of A description of the fossil. A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New Jersey descriptionoffos00fowl Year: 1911 i68 CRETACEOUS AND TERTIARY FISH. Tooth with crown compressed, elongate, acuminate, with entire keel extending along each edge to base, and transverse section elliptical. Enamel of crown smooth. Root about equal in length to crown, conic continuation of crown apparently, and below hol- low. Length 28 mm. Formation and locality. Originally from the Cretaceous Fig. 103.—Ischyrhiza mira Leidy. Haddonfield (Ford). greensand and No. 5. I have examined a single tooth, described above, in the matrix or Hadrosaurus clay from Haddonfield (J. Ford). [The specimen from Haddonfield is referable to the Woodbury clay; from Harrisonville (Cope) to the Hornerstown marl or Vincentown limesand, K.] Order ACANTHOPTERI. THE SPINY RAYED FISHES. Mouth edge formed by premaxillary. Maxillary normally distinct, always present, sometimes ossified with premaxillary. Shoulder-girdle connected by post-temporal with skull. Post- temporal normally furcate, usually not ossified with skull. Hy- percoracoid and hypocoracoid distinct, ossified, former usually perforate. No mesocoracoid or interclavicles so far as known. Pharyngeals well developed, lower rarely united, third upper largest, fourth often absent. Opercular apparatus complete. Front vertebras unmodified, without ossicula auditus. Gill-open- ing before pectorals. Gills laminated. Air-vessel typically with- out duct in adult. Scales variable, typically ctenoid. Lateral line usually extends high. Front dorsal and anal rays typically
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