Early Devonian fishes from Utah : Heteroostraci earlydevonianfis117deni Year: 1953 C Fig. 85. Heterostracian of undetermined family. A, B, PF 945 (X 1): A, left postero-lateral part of dorsal shield; B, incomplete ventral shield. C, fragment of branchial plate with branchial opening, PF 946 (X 1,^2)- to that of the ventral shield except that it is less irregular and some- what finer. The position of the branchial opening in this form is indicated by another specimen (PF 946) from locality D (fig. 85, C). This is a fragmentary plate, externally covered with the same type of orna- ment as on
Early Devonian fishes from Utah : Heteroostraci earlydevonianfis117deni Year: 1953 C Fig. 85. Heterostracian of undetermined family. A, B, PF 945 (X 1): A, left postero-lateral part of dorsal shield; B, incomplete ventral shield. C, fragment of branchial plate with branchial opening, PF 946 (X 1,^2)- to that of the ventral shield except that it is less irregular and some- what finer. The position of the branchial opening in this form is indicated by another specimen (PF 946) from locality D (fig. 85, C). This is a fragmentary plate, externally covered with the same type of orna- ment as on PF 945 and characterized particularly by an elongate opening that pierces the plate obliquely. There can be no question that this is the branchial opening, and that this plate represents a branchial plate. It can be compared only to the so-called 'branchial- cornual' plates of Traquairaspis (White, 1946, figs. 20-23), the only previously known heterostracian in which the branchial opening lies within the branchial plate rather than on its margin.
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