Publisher's Synopsis
Excerpt from Catalogue of the Australian Stalk-and Sessile-Eyed Crustacea
The Crustacea are a group of back-boneless or invertebrate animals, distinguished by the possession of a more or less hard jointed external crust or exoskeleton, nearly all living habitually in water, and breathing by means of gills.
Of the Crustacea the large group of the Malacostraca are distinguished from the rest (the Entomostraca) by the number of the segments of the body, of which there are always twenty, except in certain cases in which amalgamation or abortion of one or more of the segments has taken place.
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