. Early Devonian fishes from Utah : Heteroostraci. Fishes, Fossil; Paleontology -- Devonian; Paleontology -- Utah. Fig. 65. A, Allocnjpfaspis elUpficus, PF 439 (X IM); impression of anterior part of dorsal shield, showing sensory canals. B, A. utahensis, PF 749; right dorso- lateral scale (X 2). Poraspis. At the anterior edge, there are two transverse ridges or sometimes only one. The anterior and antero-lateral overlap areas are relatively broad. The dorso-lateral scales (fig. 65, B) differ from those of Poraspis in certain details. There is probably a greater number of dentine ridges than in
. Early Devonian fishes from Utah : Heteroostraci. Fishes, Fossil; Paleontology -- Devonian; Paleontology -- Utah. Fig. 65. A, Allocnjpfaspis elUpficus, PF 439 (X IM); impression of anterior part of dorsal shield, showing sensory canals. B, A. utahensis, PF 749; right dorso- lateral scale (X 2). Poraspis. At the anterior edge, there are two transverse ridges or sometimes only one. The anterior and antero-lateral overlap areas are relatively broad. The dorso-lateral scales (fig. 65, B) differ from those of Poraspis in certain details. There is probably a greater number of dentine ridges than in a comparable scale of Poraspis; this is no doubt correlated with the larger size of Allocryptaspis, since the ridges are coarser in the latter. The dentine ridges have a pronounced down- ward curvature towards the anterior edge, where they are bounded by two dorso-ventrally directed ridges, broken into short lengths. The anterior overlap area is relatively narrow, while the antero- dorsal and antero-ventral overlap areas are very long dorsally and ventrally, though narrowed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison, Robert H. (Robert Howland), 1911-1985; Roy, Sharat Kumar, 1897-1962, joint editor Chief Curator, Dept. of Geology; Ross, Lillian A. joint editor Associate Editor of Scientific Publications. [Chicago] : Chicago Natural History Museum Press
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectfishesfossil
