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Synopsis The use of the terms types, classes, orders, families, gnera, and species in the systems of Zoology is so universal, that it would be natural to suppose that their meaning and extent are well determined and generally understood; but this is so far from being the case that it may on the contrary be said that there is no subject in Natural History respecting which there exists more uncertainty or a greater want of precision. Under these circumstances it has appeared to be particularly desirable to inquire into the foundation of these distinctions, and to ascertain if possible how far they have a real existence. Invertebrate Zoology is an enormously diverse field, providing a rich array of astonishing organisms worthy of study. Teaching of zoology is designed to excite your interest in this amazing and wonderful world, but not to satiate that interest. The book is your invitation to participate in a learner-centered in school curriculum, an environment that allows you to make first-hand discoveries about invertebrates. The book is your guide through your studies, asking you to see the organisms in new ways. The book does not tell you all that there is to see and know, nor does it give you the quick answer.