Archive image from page 122 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 DENISON: THE CYATHASPIDIDAE 425 Diagnosis.—The dorsal shield is relatively broad and weakly vaulted. There is no median process on the rostral margin, but the Fig. 147. Homalaspidella borealis (from Denison, 1963); ventral shield, Prince- ton 17092 (X 4). preorbital processes are strongly developed. Narrow, downwardly directed lateral laminae extend from the orbits to the branchial openings and are separated from the r
Archive image from page 122 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 DENISON: THE CYATHASPIDIDAE 425 Diagnosis.—The dorsal shield is relatively broad and weakly vaulted. There is no median process on the rostral margin, but the Fig. 147. Homalaspidella borealis (from Denison, 1963); ventral shield, Prince- ton 17092 (X 4). preorbital processes are strongly developed. Narrow, downwardly directed lateral laminae extend from the orbits to the branchial openings and are separated from the rest of the shield by sharp an- gulations. There are no postbranchial lobes, and the postero-lateral corners of the shield are small points. The posterior edge of the dor- sal shield is nearly transverse except for a small, median, projecting scale that is incorporated. No epitega are distinguishable. Ariaspis ornata Denison. Figures 148-149. Ariaspis ornata Denison, 1963, Fieldiana: Geol., 14, no. 7, pp. 120-123, figs. 68-69.
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