. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. Order 2.—Chilognatha. The shape of the body is cylindrical or suhcylindrical. There is a fowr-lohed plate behind the mandibles, and tioo j)ciirs of legs on each segment {the anterior segments excepted). The genital openings are on the coxal joint of the second pair of legs. The body of the Chilognatha is, as a rule, cylindrical or sub- cylindrical. The segments have the form of complete lings, or are provided with special dorsal plates. In many cases {Jididce) the body is much elongated; in others {
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. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. Order 2.—Chilognatha. The shape of the body is cylindrical or suhcylindrical. There is a fowr-lohed plate behind the mandibles, and tioo j)ciirs of legs on each segment {the anterior segments excepted). The genital openings are on the coxal joint of the second pair of legs. The body of the Chilognatha is, as a rule, cylindrical or sub- cylindrical. The segments have the form of complete lings, or are provided with special dorsal plates. In many cases {Jididce) the body is much elongated; in others {Glomeris) it is short, like that of The antennae are short, and consist only of seven joints, h ^^. of which the last may abort. The mandibles are provided with broad masticating surfaces, Avhich serve to crush the vegetable matters on which the animals feed, and with an upper movably articulated pointed tooth. The maxillre are united so as to form an inferior buccal plate, the sides of which bear two rudimentary hook-shaped blades (fig. 427, b), while the middle portion appears to represent the underlip. The eyes, which as a rule consist of aggregated simple eyes, are situated above and external to the antennre. The anterior thoracic legs are as a rule directed forwards towards the mouth. The three thoracic segments, and sometimes the next two or three segments, bear a single pair of legs. All the others, except the seventh in the male, bear two paii-s. Stigmata are present in all the segments, and are more or less hidden beneath the coxal joints of the limbs. The rows of pores (foramina rejnignatoria) on either side of the back, which are often taken for rows of stigmata, are the openings of cutaneous glands, and secrete a cor- rosive fluid for the protection of the animal. The generative organs open en the coxal joint of the second pair of legs, and in the male sex there is also a paired copulatory organ present on the seventh Fio. 42".—(7, GJomerii marginata (afte