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Updated: May 1, 2025
The drying-up process was gradual, yet swift. The crocodiles sensed its coming and buried themselves deep in the mud to æstivate until the coming of the rainy season; also the lung-fishes, queer little creatures resembling tadpoles, which could live week after week under the hard crust with only a pinhole in the surface through which to breathe.
Ceratodus is particularly interesting on account of the primitive build of its skeleton; the cartilaginous skeleton of its two pairs of fins, for instance, has still the original form of a bi-serial or feathered leaf, and was on that account described by Gegenbaur as a "primitive fin-skeleton." At the same time the gills also are developed as water-breathing organs in all these lung-fishes.
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