. The bird, its form and function . and lifts him clear. Fig. 42.—Amphioxus, one of the lowest vertebrates, with a mere thread ofgristle foreshadowing the back-bone of higher animals. This creature bur-rows in the sand along the Atlantic coast. of corals, snails, insects, and worms, into the realm ofback-boned animals. This notochord lies underneath athin white line which is all the spinal chord he has, and,at the front end of this, a tiny dot of pigment standsfor brain, eye, and ear. Indeed Amphioxus has neitherskull, brain, nor limbs. The history of the back-bone, like human history, isnot a
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. The bird, its form and function . and lifts him clear. Fig. 42.—Amphioxus, one of the lowest vertebrates, with a mere thread ofgristle foreshadowing the back-bone of higher animals. This creature bur-rows in the sand along the Atlantic coast. of corals, snails, insects, and worms, into the realm ofback-boned animals. This notochord lies underneath athin white line which is all the spinal chord he has, and, at the front end of this, a tiny dot of pigment standsfor brain, eye, and ear. Indeed Amphioxus has neitherskull, brain, nor limbs. The history of the back-bone, like human history, isnot altogether a majestic upward evolution; it has itstragedies and set-backs, its hopes and failures. In thewaters along our Northern seashores are creatures, somesponge- or lichen-like, others with strange bulb-like bodies The Framework of the Bird 67 growing on the end of long stalks. We call them almostplants. But they hold a secret from the crabs and snailswhich crawl about, and w^hen the fishes brush against