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But the same may be said of every single arthropod and annelid if it be meant that all these organs are not contained in every possible slice. While if it be meant that parts of all such organs are contained in certain slices, then some of the mollusca may also be included. Another objection to Mr.
Then, if there comes a click in his internal time-clock, he may set out upon another quest more cabined, cribbed, and confined than any member of a Cook's tourist party. I once watched an ant with a piece of leaf which had a regular shepherd's crook at the top, and if his adventures of fifty feet could have been caught on a moving-picture film, Charlie Chaplin would have had an arthropod rival.
A spider on the other hand is an arthropod, made up of a cepolothorax joined to an abdomen. It does not grow wings at any stage of its life. It is eight-legged, and in place of the normal insect antennae it has pedipalps. A spider generally has eight simple eyes or it could have six eyes e.g. a spitting spider. Depending on the species the eyesight may be well or poorly developed.
At that ancient epoch not only were the vertebrate, molluscous, and arthropod types distinctly and clearly differentiated, but highly developed forms had been produced in each of these sub-kingdoms. But Professor Huxley has kindly informed me that he has discovered a jugular fish in the Permian deposits.
The pupae, indeed, cannot at all be regarded as members of an original developmental series, the individual stages of which represent permanent ancestral states, for an animal like the mouthless and footless pupa of the Silkworm, enclosed by a thick cocoon, can never have formed the final, sexually mature state of an Arthropod.
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