. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 443. Fig. 156. "Archegonaspis'' drummondi, type; internal impression of dorsal shield, Museum of Comparative Zoology 8875 (X 3). k-,-s, impressions of gill pouches; pfo, fossa for pineal organ; sec, impression of semicircular canal. cussion of Vernonaspis vaningeni. Since Flower and Wayland-Smith have designated an unrecognizable fragment as lectotype, this name becomes a nomen dubium and further use of it becomes impracticable. "Archegonaspis" drummondi Flowe
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 443. Fig. 156. "Archegonaspis'' drummondi, type; internal impression of dorsal shield, Museum of Comparative Zoology 8875 (X 3). k-,-s, impressions of gill pouches; pfo, fossa for pineal organ; sec, impression of semicircular canal. cussion of Vernonaspis vaningeni. Since Flower and Wayland-Smith have designated an unrecognizable fragment as lectotype, this name becomes a nomen dubium and further use of it becomes impracticable. "Archegonaspis" drummondi Flower and Wayland-Smith. Fig- ure 156. Archegonaspis drummondi Flower and Wayland-Smith, 1952, Bull. Mus. Comp. Zool., 107, pp. 380-381, pi. 2. figs. 1-2. Archegonaspis cf. drummondi Flower and Wayland-Smith, 1952, Bull. Mus. Comp. Zool., 107, pp. 381-382, pi. 6. Archegonaspis ? sp. Flower and Wayland-Smith, 1952, Bull. Mus. Comp. Zool., 107, pp. 382-384, fig. 2, pi. 3, fig. 6, pi. 7, pi. 8. fig. 3. Type.—Museum of Comparative Zoology 8875, impression of the inner side of a dorsal shield (fig. 156). Occurrence.—Late Silurian, Vernon shale (Salina group); 2 miles southeast of Kenwood, Oneida County, New York. Discussion.—In the type specimen, the length of mm. indi- cates a considerably smaller species than the others from the Vernon. 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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