The Invertebrata: A Manual for the Use of Students (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from The Invertebrata: A Manual for the Use of Students

In the great assemblage of triploblastic phyla, the backboned animals, or Vertebrata properly so-called, stand as a branch of one phylum, the Chordata. Yet their considerable numbers, the size, high organization, and intelligent activity of their members, and the fact that Man is one of them, give them an importance so great that they have always been the subject of a distinct department of zoo logical study, and were at one time regarded as a primary branch of the Animal Kingdom. That standing they have lost; but it is still necessary for many purposes to treat them apart.

The term Invertebrata is retained to cover all the non-chordate phyla and the chordates other than the Vertebrata. In that sense it is used in this book. Only the Cephalochorda which, though they are not vertebrates, have much in common with those animals, are left aside as best studied with them.

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