. Principles of economic zoo?logy. Zoology, Economic. ARACHNIDA 103 of rolling up into a ball when surprised. Its protective resem- blance is good. Its locomotion is by crawling or running. Some of the marine Arthrostraca are parasitic on crabs and in the mouths of fishes. CLASS n. ARACH'NIDA Arachnids are arthropods with the head and thorax generally fused into a cephalothorax, bearing six pairs of appendages. The first and second pairs are for biting. Then follow four pairs of walking legs. There are no antennae, the eyes are simple, and the abdomen is apodal.'^ The abdomen varies much. It i
. Principles of economic zoo?logy. Zoology, Economic. ARACHNIDA 103 of rolling up into a ball when surprised. Its protective resem- blance is good. Its locomotion is by crawling or running. Some of the marine Arthrostraca are parasitic on crabs and in the mouths of fishes. CLASS n. ARACH'NIDA Arachnids are arthropods with the head and thorax generally fused into a cephalothorax, bearing six pairs of appendages. The first and second pairs are for biting. Then follow four pairs of walking legs. There are no antennae, the eyes are simple, and the abdomen is apodal.'^ The abdomen varies much. It is short in the spiders, long in the scorpions, or is fused with the thorax, forming a stout body in the mites. They are usually oviparous. How- ever, some scorpions and some mites are viviparous. They are generally terrestrial, but some live in the water. There is no well-marked metamorphosis. Order I. Scorpion'ida.—Scorpions (Fig. 76) are arachnids with long slender bodies ending in a poison fang. The head and thorax are fused and bear several pairs of jointed appendages. The abdomen consists of a broad anterior and a narrower posterior portion. There are several pairs of eyes. Respiration is by means of four pairs of lung-sacs opening on ventral side of abdomen from the third to sixth segments. Food.—They are carnivorous, feeding upon spiders and in- sects, which they seize with their pincers and sting to death. Multiplication.—They are viviparous. The mother cares for the young with great solicitude, carrying them about at- tached to her body. ' See Fig. 76.—Carolina scor- pion {Bu'ihus carolinia'nus).. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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