. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. Text-figure 67- Text-figure 68 Interior of the mouth and pharynx of a young (probably recently hatched) Japanese Bullhead Shark, Heterodontus japonicus. Text-figure 67. Roof of the oro-pharyngeal cavity, revealing the teeth of the upper jaw, the breathing valve, and the pharyngeal denticles. Text-figure 68. Floor of the oro-pharyngeal cavity, showing the teeth of the lower jaw, also both oral and pharyngeal denticles. After drawings left by Bashford Dean. The earliest stage, represented by Text-figure 66, represents the roo
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. Text-figure 67- Text-figure 68 Interior of the mouth and pharynx of a young (probably recently hatched) Japanese Bullhead Shark, Heterodontus japonicus. Text-figure 67. Roof of the oro-pharyngeal cavity, revealing the teeth of the upper jaw, the breathing valve, and the pharyngeal denticles. Text-figure 68. Floor of the oro-pharyngeal cavity, showing the teeth of the lower jaw, also both oral and pharyngeal denticles. After drawings left by Bashford Dean. The earliest stage, represented by Text-figure 66, represents the roof of the mouth cavity viewed from below. This drawing was made from the 78-mm. embryo, in Dean's collection, described and figured (Figure 38, plate III) in the present article. The lower jaw of this embryo has been cut away in order to expose the roof of the mouth. I have compared this dissection with Dean's drawing (Text-figure 66) and can state that the drawing corresponds, in every detail, with the structures revealed by the dissection. Teeth are not yet visible; but the arch-like dental ridge (formed by the lower surface of. 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 Dean, Bashford, 1867-1928; Gudger, E. W. (Eugene Willis), 1866-1956. New York : [American Museum of Natural History],
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Keywords: ., book, bookcentury1900, booksubjectfishes, booksubjectfishesfossil
