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Updated: May 24, 2025
In the first year the two osseous halves of the arches unite; but it is much later in the second to the eighth year that they connect with the osseous vertebral bodies. A, B, cartilaginous series of the fin-stem. rr cartilaginous fin-radii. R, R, radii of the lateral fin-border, mt metapterygium, ms mesopterygium, p propterygium. Skeleton of the breast-fin of a young Selachius.
The radii of the median fin-border have wholly disappeared. The shaded part on the right is the section that persists in the five-fingered hand of the higher Vertebrates.
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