. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 406 ARTHROPODA. T rigid surfaces, which are obtained partly by the development of internal chitinous tendons and plates, and partly by the hardening of the integument and the fusion of several segments to form larger armoured regions. It is only when the movements are simpler and resemble those of Annelids, that all the segments remain independent and bear similar appendages along the whole length of the body (larva?, Myriapoda). In general, three regions of the body can be distinguished, t
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 406 ARTHROPODA. T rigid surfaces, which are obtained partly by the development of internal chitinous tendons and plates, and partly by the hardening of the integument and the fusion of several segments to form larger armoured regions. It is only when the movements are simpler and resemble those of Annelids, that all the segments remain independent and bear similar appendages along the whole length of the body (larva?, Myriapoda). In general, three regions of the body can be distinguished, the head, the thorax, and the abdomen, the appendages of which possess respectively a FIG. 320.—Head, thorax and abdomen of an Ac-ridium, seen !•&• from the side. St. Stigmata; T, tympanum. different structure and f unction(). The head constitutes the short and compact anterior region of the body, is covered by a hard integument, encloses the 'brain and bears the sense organs and mouth-parts (jaws). The appendages of this region are modified to form the antennce and jaws. The head of Arthropods, as compared with that of Annelids, contains, besides the frontal (prseoral) or antenna! segment and the oral segment, in. fit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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