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Updated: May 26, 2025
On the whole, I am disposed to think that the direct stem of ascent from the Monorhina to the Amphibia is formed by the Ganoids and the Mudfishes; while the Osseous fishes and the Sharks are branches in different directions from this stem.
You can judge for yourself how thick the water was, that such mudfishes as these should have been choked to helplessness. Our captured fish were given a bath in a bucket of rain-water, and we had a fish dinner. In the afternoon we made a test of the water from the river, and found that it contained 20 per cent of an alkaline silt.
So again, while the group of fishes, termed ganoids, is, at the present time, so distinct from that of the dipnoi, or mudfishes, that they have been reckoned as distinct orders, the Devonian strata present us with forms of which it is impossible to say with certainty whether they are dipnoi or whether they are ganoids.
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