Meckel's cartilage is of course not seen in the dried skull.

The part of Meckel's cartilage which in most vertebrates ossifies, forming the articular bone, remains unossified in the Frog.

It is very interesting (as well as amusing), in view of subsequent ideas about variability, to note what Meckel said.

The first discussion of the comparative variability of the sexes was broached about a century ago by an anatomist, Meckel.