United States or El Salvador ? Vote for the TOP Country of the Week !
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.
Word Of The Day