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These are all the cartilage bones that appear in the cranium and upper jaw of the frog.

Reichert objected to the distinction drawn by Kölliker, and denied that there was either a histological or a morphological difference between membrane and cartilage bones.

The development of the cartilage bones, however, is more complicated.

In all cartilage is dotted, cartilage bone cross-barred, and membrane bone, white.

Is there a clear line of demarcation between membrane bones and cartilage bones?