The proportions of the four ossifications are approximately the same.
In Teleostei and bony Ganoids, a considerably greater number of ossifications occur in the cartilage.
There are three centres of ossifications for each vertebra, two in the arch and one in the centrum.
In Polypterus the pectoral fin (fig. 18, B) shows three ossifications in the basal part of the fin—pro-, meso- ...