. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 172 IOWA GEOLOGICAL SURVEY. Fig. 24. Fig. 24. Macropetalichthys rapheidolabis Norw. & Owen. Middle Devonian: Indiana, Ohio and New York. Restoration of headshield showing arrangement of cranial plates and course of sensory canals. ii C1, C2, divided centrals; EO, external occipital; M, marginal; HO, median occipital; P, combined pineal and rostral, corresponding to the anterior median unpaired plate ("mesethmoid") in Neoceratodus; PO, preorbital; PtO, postorbital plate. a single pair of elements occupying the
. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 172 IOWA GEOLOGICAL SURVEY. Fig. 24. Fig. 24. Macropetalichthys rapheidolabis Norw. & Owen. Middle Devonian: Indiana, Ohio and New York. Restoration of headshield showing arrangement of cranial plates and course of sensory canals. ii C1, C2, divided centrals; EO, external occipital; M, marginal; HO, median occipital; P, combined pineal and rostral, corresponding to the anterior median unpaired plate ("mesethmoid") in Neoceratodus; PO, preorbital; PtO, postorbital plate. a single pair of elements occupying the same relative position as in Homosteus. The posterior moiety of this plate is seen to be traversed by three distinct canal systems, identifiable with those called by Dean the preorbital, postorbital and occipital. Now, in the headshield of all Arthrodires so far as known, the central. 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 Eastman, Charles Rochester, 1868-1918; Iowa Geological Survey. Des Moines : Iowa Geological Survey
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