Publisher's Synopsis
Excerpt from A Guide to the Study of Insects, and a Treatise on Those Injurious and Beneficial to Crops: For the Use of Colleges, Farm-Schools, and Agriculturists
The typical Crustacean cannot be said to have a true head, in distinction from a thorax bearing the organs 'of locomotion, but rather a group of rings, to which are appended the organs of sensation and locomotion. Hence we find the appendages of this region gradually changing from antennae and jaws to foot-jaws, or limbs capable of eating and also of locomotion; they shade into each other as seen in Fig. 9. Sometimes the jaws become remarkably like claws or the legs resemble jaws at the base, but towards their tips become claw-like; gill-like bodies are sometimes attached to the foot-jaws, 'and thus', as stated by Professor J. D. Dana in the introduction to his great work on the Crustacea of the United States Exploring Expedi tion, the typical Crustaceans do not have a distinct head, ' but rather a head-thorax (cephalothorax).
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