BRANCH ARTHROPODS ; CLASS ARACHNID A : SPIDERS 233 



many silk-glands in the abdomen, from each of which a 

 fine duct runs to a spinning-tube. 



The spiders may be divided into two groups according 

 to their habits, viz., the wandering or hunting spiders, 



FIG. 94. The six spinner- 

 ets (below) of a spider, 

 with one spinneret en- 

 larged (above) to show 

 the spinning "spools" 

 or tubes. (From Jenkins 

 and Kellogg.) 



FIG. 95. A long-legged spider, 

 Tetragnatha sp., on its web. 

 (From life.) 



which do not spin webs to catch their prey, and the 

 sedentary or web- weaving spiders, which spin snares to 

 catch their prey. The wandering spiders can spin silk, 

 however, and often do so to line their burrows, to make 

 nests, or to make egg-sacs. 



The hairy tarantulas and the trap-door spiders of 

 similar appearance are among the most interesting of 



