. Elements of comparative zoology. Zoology. 270 SYSTEMATIC ZOOLOGY. these torments. The best is, possibly, the pouring of kerosene upon the surface of all stagnant water. This. Fig. 89.—Larva (a) and pupa (&) of mosquito. will kill the eggs as they are laid, while it also destroys the perfect insects as they come from the water. Summary of Important Facts. 1. The Arthropoda share with the Annelids a marked external and internal segmentation, expressed externally by the ringing of the body and the distribution of the appendages; internally by the chambering of the heart, the distribution of
. Elements of comparative zoology. Zoology. 270 SYSTEMATIC ZOOLOGY. these torments. The best is, possibly, the pouring of kerosene upon the surface of all stagnant water. This. Fig. 89.—Larva (a) and pupa (&) of mosquito. will kill the eggs as they are laid, while it also destroys the perfect insects as they come from the water. Summary of Important Facts. 1. The Arthropoda share with the Annelids a marked external and internal segmentation, expressed externally by the ringing of the body and the distribution of the appendages; internally by the chambering of the heart, the distribution of the ganglia, and, so far as they are present, by the arrangement of the tracheae. 2. They are distinguished from the Annelids by the presence of jointed appendages, a pair to a somite, as well as by the unequal development of the somites, and by the grouping of the somites in regions. 3. Three regions may be distinguished: a head with the parts concerned in sensation and the taking of food; a thorax, concerned in locomotion; and an abdomen, in which the primitive segmentation is most perfectly re- 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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