. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The Embryology of Heterodontus japonicus 755. Text-figure 63. A position sometimes assumed by a newly hatched Heterodontus japonicus when resting on the bottom of the aquarium. From a drawing left by Bashford Dean. The gill-clefts have been redrawn in a more nearly correct position. swam easily and well, it showed varied movements of its pectorals: it bit, retreated and ad- vanced, it stood on the defensive, and it opened its mouth widely [Text-figures 64b and 64c] as though to inspire fear. During [ordinary] breathing [Tex
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. The Embryology of Heterodontus japonicus 755. Text-figure 63. A position sometimes assumed by a newly hatched Heterodontus japonicus when resting on the bottom of the aquarium. From a drawing left by Bashford Dean. The gill-clefts have been redrawn in a more nearly correct position. swam easily and well, it showed varied movements of its pectorals: it bit, retreated and ad- vanced, it stood on the defensive, and it opened its mouth widely [Text-figures 64b and 64c] as though to inspire fear. During [ordinary] breathing [Text-figures 64a] it showed normally only the most anterior teeth. The color of the fish at hatching is dark [Figure 83, plate VII] with a series of light bands: it is covered with a dense "bloom" of mucus. Two weeks later [Figure 84, plate VII] it has grown 25 mm.; it has changed color, shows a kind of opisthure', holds its fins more rigidly. The present figure indicates that down the sides of the body, in this as in [some] earlier stages, there is a row of (16-17) deep vertical creases immediately behind the gill-slits. They suggest a continuation of the line of the gills, with which obviously they have nothing to do. One reflects that it would be easy for an enthusiast to construct a phylogeny in which these deep creases fused with gut pouches and became of respiratory value. The spiracle is still of considerable size, and the dermal denticles are prominent. The latter condition is doubtless protective, guarding against injury from rubbing, and correlated with a long period of incubation in a 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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