Centipede
2 of the 7 encyclopedias on this shelf carry an entry for Centipede. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
sen'ti-ped, a class of animals allied to insects and crustacea. The centipede has a worm-shaped body of from 6 to 200 segments, with a head distinctly separated from the body by a neck. Each segment has a pair of legs, and the head bears a pair of antennae. Centipede means having one hundred feet. The millipede, or thousand legged worm, differs chiefly in having two pairs of legs on each segment, a body less flattened, and shorter antennae. The centipede lives on insects; the millipede on decaying wood. Our northern species are harmless. The centipede is useful in houses. It springs upon water-bugs and other insects, holding them down with its numerous legs until it has sucked the life out of them. The California centipede is from five to eight inches in length. It has twenty-two segments--twenty-two pairs of legs. Each "leg" ends in a sharp point. When angered the animal clasps its victim, driving all forty-four points into the flesh, stinging as if with hot needles. Boys mount and sell them as curiosities.
Collier's New Encyclopedia (1921)
a genus of Myriopoda, having a long, slender, depressed body, protected by coriaceous plates, 21 pairs of legs, distinct eyes, 4 on each side, and antennæ with 17 joints. The name is, however, popularly extended to species of nearly allied genera. Centipedes run nimbly, feed on insects, and pursue them into their lurking places. They have not only a pair of horny jaws, like those of insects, but also another pair of organs closely connected with the mouth, and which are regarded as transformed legs, dilated and united at the base, terminated by a strong hook, and pierced beneath the extremity for the emission of a venomous fluid, which makes their bite quickly fatal to insects, and, in the case of the larger species, very painful, and even dangerous to the larger animals and to man.