Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 DENISON: EARLY DEVONIAN FISHES 527 fenestra, at least in the form upon which this part of the restoration was based. Williamsaspis has a very large posterior lateral, relatively short and very high, peculiarly shaped, laterally ridged, and with a rather large edge for the pectoral fenestra; presumably this is a specialized condition, since nothing approaching it is found in other euarthrodires. In the Brachythoraci the posterior lateral is almost -\^-^W Fig. 111. Right posterior lateral plates of A
Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 DENISON: EARLY DEVONIAN FISHES 527 fenestra, at least in the form upon which this part of the restoration was based. Williamsaspis has a very large posterior lateral, relatively short and very high, peculiarly shaped, laterally ridged, and with a rather large edge for the pectoral fenestra; presumably this is a specialized condition, since nothing approaching it is found in other euarthrodires. In the Brachythoraci the posterior lateral is almost -\^-^W Fig. 111. Right posterior lateral plates of Arctolepida, all reduced to the same area. A, Phlyctaenaspis acadica, after Heintz, 1933 (X ; B, 'P.' heintzi, after Gross, 1933b (X ); C, Aefhaspis major, restored from PF 924 (X ); D, Anarthraspis sp., PF 1541 (X ); E, Bryantolepis brachycephalus, PF 183 (X ). s. AL, s. PVL, external overlap areas for anterior lateral and posterior ventro- lateral. invariably reduced in connection with the posterior reduction of the trunk shield. A small but well-developed posterior lateral, relatively long and low in proportions, is believed to be primitive in the Arctolepida. The anterior ventro-lateral plates (fig. 112, AVL) are constructed on a plan very similar to that of the anterior laterals. The lateral border attaches to the spinal in a simple harmonic suture and shows modifications similar to those of the spinal edge of the anterior lateral; it is long in forms with a long spinal and tends to be short in those with a short spinal. The anterior border unites with the intero-lateral in a harmonic suture, while the antero-medial, medial.
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