Archive image from page 115 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 418 FIELDIANA: GEOLOGY, VOLUME 13 Referred specimens.—Incomplete dorsal shields, CNHM, PF 862, 3641, 3643; fragments of dorsal shields, PF 865, New York State Mus. 11469. Fig. 142. Americaspis cf. claypolei, anterior half of dorsal shield, New York State Museum 10678 (X 3). Occurrence.—Late Silurian, Longwood shale, Shin Hollow, along Erie Railroad tracks about 1 miles south-southeast of Graham Station, Orange County,
Archive image from page 115 of The Cyathaspididae; a family of. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates cyathaspididaefa135deni Year: 1964 418 FIELDIANA: GEOLOGY, VOLUME 13 Referred specimens.—Incomplete dorsal shields, CNHM, PF 862, 3641, 3643; fragments of dorsal shields, PF 865, New York State Mus. 11469. Fig. 142. Americaspis cf. claypolei, anterior half of dorsal shield, New York State Museum 10678 (X 3). Occurrence.—Late Silurian, Longwood shale, Shin Hollow, along Erie Railroad tracks about 1 miles south-southeast of Graham Station, Orange County, New York. Diagnosis.—The length of the dorsal shield is about 40 mm., and it is of rather narrow proportions. The dentine ridges are fine, about 63-8 per mm., with the coarsest ones on the rostrum and over the orbits, and the narrowest ones near the lateral margins. The ridges are slightly convex centrally, sharp-crested laterally, and broad and flat-topped anteriorly on the rostrum. Discussion.—The incompleteness and poor preservation of most specimens makes it difficult to characterize this species and to deter- mine its relationships. In its known characters it agrees well with Americaspis americana, except in its smaller size and in its broad, flat ridges on the anterior part of the rostrum. It has a small median rostral lobe and strong preorbital processes. The postbranchial lobes are long and distinctly marked anteriorly, but are rather weakly de-
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