. Animal biology. Zoology; Biology. Fig. 178.—The long-legged house centipede, Scutigera forceps. When a few of its numerous legs are seized and held the centipede instantly detaches its body from these legs and flees to safety on its remaining legs. In about a month it will regenerate new legs to replace those that were lost. If, however, it is irritated sufficiently, it will detach all of its legs, and then accelerating its regenerative processes will produce a full set of new legs in about two weeks. Ranges from southern United States as far north as New York and Nebraska. (From Marlatt, Fa
. Animal biology. Zoology; Biology. Fig. 178.—The long-legged house centipede, Scutigera forceps. When a few of its numerous legs are seized and held the centipede instantly detaches its body from these legs and flees to safety on its remaining legs. In about a month it will regenerate new legs to replace those that were lost. If, however, it is irritated sufficiently, it will detach all of its legs, and then accelerating its regenerative processes will produce a full set of new legs in about two weeks. Ranges from southern United States as far north as New York and Nebraska. (From Marlatt, Farmer's Bulletin, No. 627, U. S. Dept. Agriculture, 1914.) 310. Millipedes.—The millipedes, or thousand-legged worms (Fig. 179), differ from the centipedes in several ways. The body is sub- cylindrical rather than flattened. The legs are very short, generally two pairs to a segment, and the animal tends to react by rolling up into a flat coil instead of by running away. There is a pair of mandibles and one of maxillae, and either simple or compound eyes. The millipedes also. Fig. 179.—A millipede, Spirobolus sp., from South Carolina. Natural size. From a preserved specimen. live in dark, moist places but feed principally upon plant food and therefore are likely to be injurious, whereas the centipedes are likely to be beneficial. 311. Reproduction in Myriapods.—In all myriapods the sexes are separate. Some millipedes are known to lay large numbers of eggs in cells excavated in the ground, which are later sealed up, but in the case of the centipedes the eggs are laid singly in the damp earth. The larva when hatched has only a few metameres and a few legs. The larvae of the millipedes have only three pairs of legs, in this respect resembling insects. As the animal grows, new metameres, each with a pair of legs, are added just in front of the posterior one. Thus the total number of metameres in the body is an indication of the age of the Please note that these i
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