Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 Fig. 106. Right suborbital plate of Arctolepida and Coccosteidae, all reduced to the same area. A, Coccosteus decipiens, after Heintz, 1931 (X ); B, C. minor, PF 1101 (X ); C, Bryantolepis brachycephalus, PF 1597 (X ); D, Phlyctaenaspis acadica, British Museum (Natural History), P 6555 (X ); E, Anarthraspis sp., restored from PF 1538, 1535 (X ); F, Aethaspis utahensis, PF 1403 (X ). which must have formed a movable joint with the postorbital; the blade is very long and squarely truncate behind
Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 Fig. 106. Right suborbital plate of Arctolepida and Coccosteidae, all reduced to the same area. A, Coccosteus decipiens, after Heintz, 1931 (X ); B, C. minor, PF 1101 (X ); C, Bryantolepis brachycephalus, PF 1597 (X ); D, Phlyctaenaspis acadica, British Museum (Natural History), P 6555 (X ); E, Anarthraspis sp., restored from PF 1538, 1535 (X ); F, Aethaspis utahensis, PF 1403 (X ). which must have formed a movable joint with the postorbital; the blade is very long and squarely truncate behind. Phlyctaenaspis has an angulate posterior border divided into a postero-dorsal edge presumably for the internal plate and a postero-ventral border for the postsuborbital. In Bryantolepis the blade is relatively small. The infraorbital sensory canal always passes ventrally down the blade, then anteriorly along the suborbital process. From this the supramaxillary canal extends postero-ventrally, but this canal has not been seen in Anarthraspis and Bryantolepis. In Coccosteus deci- piens (fig. 106, A) the center of ossification is at the junction of these canals, but in Aethaspis it is on the infraorbital canal some distance postero-dorsal to this junction. Two other euarthrodires have suborbitals that resemble those of the Arctolepida. One is 'Coccosteus' angustus (Traquair, 1903, pi. 6, fig, 1), in which the suborbital appears to be closely com-
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