The living ceratodus was only discovered in 1870, and was regarded as a marvel of "persistence."
In ceratodus this is effected by an extension of the interauricular shelf into the ventricle.
The teeth of the extinct Dipteridae resemble those of ceratodus but are more complicated.
The Australian mudfish (ceratodus) is not known to hibernate or aestivate.
Six pairs of branchial arches occur in Protopterus; ceratodus and Lepidosiren have five, like most other fish.
His purpose was the study of the wonderful Australian fauna, the oviparous mammals, marsupials, and ceratodus (lungfish).
He ought rather to come out in the character of a ceratodus or a labyrinthodon.
However, teeth are found in the Trias which resemble those of the living ceratodus.
Their organization might, in some respect, be like the ceratodus and proloptems; but this is not certain.
No; but from an organ similar in character and position to the air-bladder of a ceratodus, or a lepidosiren.