. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 426 FIELDIANA: GEOLOGY, VOLUME 13. Fig. 148. Ariaspis ornata, type (from Denison, 1963); dorsal shield, Prince- ton 17103 (X 6). ms, median scale; or, orbit; pm, pineal macula. Type.—Princeton 17103, a complete dorsal shield (figs. 148-149). Occurrence.—Probably Early Devonian (Early Downtonian) lime- stones and graptolitic shales,1 Beaver River, southeastern Yukon. Diagnosis.—The length of the dorsal shield is mm. The width ratio is .72. The dentine ridges are fine, per mm., and have sharpl
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 426 FIELDIANA: GEOLOGY, VOLUME 13. Fig. 148. Ariaspis ornata, type (from Denison, 1963); dorsal shield, Prince- ton 17103 (X 6). ms, median scale; or, orbit; pm, pineal macula. Type.—Princeton 17103, a complete dorsal shield (figs. 148-149). Occurrence.—Probably Early Devonian (Early Downtonian) lime- stones and graptolitic shales,1 Beaver River, southeastern Yukon. Diagnosis.—The length of the dorsal shield is mm. The width ratio is .72. The dentine ridges are fine, per mm., and have sharply or roundly convex crests. 1 Tentatively assigned to the Middle Ludlovian in Denison (1963); see (p. 450).. 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 Denison, Robert H. (Robert Howland), 1911-1985; Chicago Natural History Museum. Chicago : Chicago Natural History Museum Press
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