. Animal forms; a second book of zoology. Zoology. ARTHROPODS. CLASS CRUSTACEA 111 w? 109. Peripatus (class Onychophora).—It is generally be- lieved that the Crustacea, insects, and spiders, together with their numerous relatives, trace their ancestry back to animals that bore a certain resemblance to the segmented worms. Most of these ancient types have fi long been extinct, but here and there % M throughout the earth we occasionally meet w^4 with them. Among the most interesting of these are a few widely distributed species belong- ing to the genus Peripatus (Fig. 66), but as they are compar
. Animal forms; a second book of zoology. Zoology. ARTHROPODS. CLASS CRUSTACEA 111 w? 109. Peripatus (class Onychophora).—It is generally be- lieved that the Crustacea, insects, and spiders, together with their numerous relatives, trace their ancestry back to animals that bore a certain resemblance to the segmented worms. Most of these ancient types have fi long been extinct, but here and there % M throughout the earth we occasionally meet w^4 with them. Among the most interesting of these are a few widely distributed species belong- ing to the genus Peripatus (Fig. 66), but as they are comparatively rare we shall dis- miss them with a very brief description. They usually dwell in warm countries, un- der rocks and decaying wood, emerging at night to feed on insects, wThich they ensnare in the slime thrown out from the under surface of the head. Their external form, their excretory system, and various other organs are worm-like. On the other hand, the appendages are jointed, and one pair has been modified into jaws. The peculiar breathing organs characteristic of the in- sects are also present. Peripatus therefore gives us an interesting link between the worms and insects, and also affords an idea of the primitive insects from which the modern forms have descended. 110. The centipeds and millipeds (class Myriapoda).—Many of the myriapods—that is, the centipeds and thousand-legged worms —are familiar objects under logs and stones throughout the United States. The first of these (Fig. 67) are active, savage creatures, devouring numbers of small animals, which they sting by means of poison-spines on the tips of the first pair of legs. The bite of the larger tropical. 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 Jordan, David Starr, 1851-1931; Heath, Harold, 1868- [from old catalog] joint a
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