. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 369. Fig. 114. Vernonaspis al- lenae, photograph of rubber impression of type dorsal shield; Museum of Compara- tive Zoology 8871 (X 3). Referred specimens.—Mus. Comp. Zool. 8873, a ventral shield, and 8874, a dorsal shield. Occurrence.—Late Silurian, Vernon shale (Salina group), 2 miles southeast of Kenwood, Oneida County, New York. Doubtfully from the Wills Creek formation, cut on Western Maryland Railroad at Round Top, near Hancock, Maryland. Diagnosis.—The length of the
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 369. Fig. 114. Vernonaspis al- lenae, photograph of rubber impression of type dorsal shield; Museum of Compara- tive Zoology 8871 (X 3). Referred specimens.—Mus. Comp. Zool. 8873, a ventral shield, and 8874, a dorsal shield. Occurrence.—Late Silurian, Vernon shale (Salina group), 2 miles southeast of Kenwood, Oneida County, New York. Doubtfully from the Wills Creek formation, cut on Western Maryland Railroad at Round Top, near Hancock, Maryland. Diagnosis.—The length of the dorsal shield is 32-33 mm. There are 6-7 dentine ridges per millimeter. The dorsal shield usually has a rounded median lobe on its posterior edge. It is rather narrow, with a width ratio of . Discussion.—The ridge pattern of the type (fig. 114) is as follows: On the rostral epitegum 3 ridges are parallel to the anterior edge; the posterior ridges are transverse but curve forward toward the sides to follow the posterior edge of the epitegum, and the central. 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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