. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 320 FIELDIANA: GEOLOGY, VOLUME 13 A orP. __--ro. Fig. 94. A, Anglaspis heintzi; ventral view of anterior part of articulated specimen, Paleontologisk Museum, Oslo, D 384 (X 3). B, Protopteraspis vogti; reconstruction of ventral side of anterior part of shield ( X 4). (Both from Heintz, 1962.) brp, branchial plate; lap, lateral plate; obp, orbital plate; olp, oral-lateral plate; orp, oral plate; ro, rostrum; rop, rostral plate; sop, suborbital plate; vs, ventral shield. Kiaer's reconstruction (fig. 90)
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 320 FIELDIANA: GEOLOGY, VOLUME 13 A orP. __--ro. Fig. 94. A, Anglaspis heintzi; ventral view of anterior part of articulated specimen, Paleontologisk Museum, Oslo, D 384 (X 3). B, Protopteraspis vogti; reconstruction of ventral side of anterior part of shield ( X 4). (Both from Heintz, 1962.) brp, branchial plate; lap, lateral plate; obp, orbital plate; olp, oral-lateral plate; orp, oral plate; ro, rostrum; rop, rostral plate; sop, suborbital plate; vs, ventral shield. Kiaer's reconstruction (fig. 90) shows the suborbital of Anglaspis to be a small, curved plate forming the whole lower border of the orbit. Anteriorly it abuts against the preorbital process, and poste- riorly it meets the upper facet of the anterior edge of the branchial plate, as well as the postorbital border of the dorsal shield. The sub- orbital plate of Irregulareaspis (Kiaer, 1932, pi. 5, fig. 2) is similar but relatively larger. In Listraspis (fig. 132, sop) the suborbital plate is fused to the dorsal shield, and forms the part of the ventral surface of the lateral brim that lies between the branchial plate and the equivalent of the preorbital process. No articulated specimens of Allocryptaspis are known, but numerous small plates of A. lati- costata have been identified with more or less certainty (Denison,. 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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