. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. MUTUAL AID AND COMMUNAL tIFE 423 is carried from place to place by the crab, and in this way is much aided in obtaining food. On the other hand, the crab is protected from its enemies by the well-armed and danger- ous tentacles of its companion. On the tentacles there are many thousand long slender stinging threads, and the fish that would eat the hermit-crab must first deal with the stinging ; If the hydroid be torn away from the shell the crab will wander about seeking ai>other
. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. MUTUAL AID AND COMMUNAL tIFE 423 is carried from place to place by the crab, and in this way is much aided in obtaining food. On the other hand, the crab is protected from its enemies by the well-armed and danger- ous tentacles of its companion. On the tentacles there are many thousand long slender stinging threads, and the fish that would eat the hermit-crab must first deal with the stinging ; If the hydroid be torn away from the shell the crab will wander about seeking ai>other polyp. When he finds one, he struggles to loosen it from the rock. FiG. 213. Hermit crab within a shell on which is growing a hydroid polyp colony. (After Weismann.) to which it is attached, and does not rest until he has torn it loose and placed it on his shell. In the nests of the various species of ants and termites many different kinds of other insects have been found. Some of these are harmful to their hosts, in that they feed on the food stores gathered by the industrious and provi- dent ant, but others appear to feed only on refuse or useless substances in the nest. Some appear to be of help to their hosts by cleaning the nests and by secreting certain fluids much liked by the ants. Over one thousand species of these myrmecophilous (ant-loving) and termitophilous (ter-. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; McCracken, Mary Isabel. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
