. The animans and man; an elementary textbook of zoology and human physiology. tive length in different spiders, and each is made up of sevenjoints. The spinnerets (fig. 77), which are situated at thetip of the abdomen, are six in number (a few spiders haveonly four), and are like little short fingers. They have attheir tips many fine little spinning-tubes from each of whicha fine silken thread issues when the spider is many fine threads fuse as they issue to form a singlestrong cable or sometimes a flat rather broad band. Thespinnerets are movable, and by their manipulation the
. The animans and man; an elementary textbook of zoology and human physiology. tive length in different spiders, and each is made up of sevenjoints. The spinnerets (fig. 77), which are situated at thetip of the abdomen, are six in number (a few spiders haveonly four), and are like little short fingers. They have attheir tips many fine little spinning-tubes from each of whicha fine silken thread issues when the spider is many fine threads fuse as they issue to form a singlestrong cable or sometimes a flat rather broad band. Thespinnerets are movable, and by their manipulation thedesired kind of line is produced. The silk comes from. FIG. 74. The cheese-mite,Tyroglyphus siro. (Greatly 166 THE ANIMALS AND MAN many silk-glands in the abdomen, from each of which afine duct runs to a spinning-tube. The spiders may be divided into two groups according to
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
