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But in fact the skull is segmented, and, according to the quasi-vertebral theory of the skull put forward by Professor Huxley, is probably formed of a number of coalesced segments, of some of which the trabeculæ cranii and the mandibular and hyoidean arches are indications.
Deep fissures or indentations showed themselves all over the sphere; and then at the end of ten or more minutes all interior action ceased, and the sphere had segmented into a coiled mass.
That attack along with the initial upset of balance did the job. The shell flopped over, its rounded hump now embedded in the watery sand of the pit while the frantic struggles of the creature to right itself only buried it the deeper. The Terran stared down upon a segmented under belly where legs were paired in riblike formation. Shann could locate no head, no good target.
The sum was fantastic, the whole story unbelievable. There was a hot stab of pain on his instep. Rynch cried out, stamped hard. One of the clawed scavengers was crushed. The man leaped back in time to avoid another step into a swarming mass of them at work on some unidentifiable carrion. Staring down at the welter of scaled, segmented bodies and busy claws, he gasped.
Except for those few gaps he had wrought, the islet was now completely enveloped. "Ahhhh " Hume's voice arose in a roar of anger and defiance. He stabbed his ray down at a spot just below their ledge. A huge segmented, taloned leg kicked, caught on the edge of the stone at the level of their feet, twisted aloft again and was gone. "Up!" Hume ordered. "To the top!"
It is immaterial to the student of instinct whether the animal have eight legs instead of six, or pulmonary sacs instead of air-tubes. Besides, the Araneida belong to the group of segmented animals, organized in sections placed end to end, a structure to which the terms 'insect' and 'entomology' both refer.
The nucleus segmented and migrated into that part of the superficial cytoplasm which remained alive, and this proceeded to develop that particular part of the embryo to which it would have given rise if the rest of the egg had not been killed. There was no regeneration of the part killed, no formation of a complete embryo. It may be pointed out that segmentation in the insect egg is peculiar.
They are variously feelers, jaws, legs, pincers, and swimming paddles, evolved to serve different purposes, just as the limbs of the vertebrates we have described have become variously arms, wings, flippers and paddles in apes, bats, seals, and whales. Butterflies, beetles, bees, and grasshoppers seem at first sight to be entirely different, even though they agree in being more or less segmented.
In all, the stockings showed deeper and richer shades of color than the other garments; and in their curiously segmented appearance, and in the harmonious arrangement of the tints, they seemed to represent the skins of pythons and other beautifully variegated serpents. All wore low shoes of an orange-brown color, fitting closely so as to display the shape of the foot.
In these respects the countless varieties of insects agree so that they also like crustacea of various kinds seem to have been derived from wormlike animals with more simply segmented bodies. Indeed spiders and scorpions and their relatives of the group arachnida prove for similar reasons to be derivatives of the same original stock, and own cousins of the insects.
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