Their living representatives include the sea urchins or 'true' echinoids, the heart-urchins or spatangoids and allied forms, the sand-dollars or clypeasteroids, and the slate-pencil-urchins, or cidaroids.

It was also a powerful marker of legitimacy and eternity and joined the Horian rituals, where Horus ascended to the throne of his father, assuming his inheritance after undergoing a trial.

This brute factness of science ought not to obscure the decisive fact that Kant provided an idealist reconstruction of this scientific realist base.

One avenue being explored is the Esk Valle line's community rail designation status, to see if standards more appropriate to a main line railway can be challenged with a view to facilitating low-cost operation of a rural branch.