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Again, there are those who have written at great length of this and that species and sub-species, with many words and nice distinctions relative to vomerine teeth, branchiostegal rays and other anatomical differences.

From the hinder edge of the hyoid arch grows out the membranous operculum, in which develop later the opercular bones and branchiostegal rays.

Geoffroy's next step is to point out that the only possible homologues of sternal ribs are the branchiostegal rays, which arise from the large bones of the hyoid arch.

These are the bones connected with respiration—the operculum, the branchiostegal rays, the branchial arches, and others.

He could reject, with a mere reference to the facts of development, Geoffroy's comparison of the hyoid and the branchiostegal rays in fish with sternum and ribs.