The Structure and Habits of Spiders. 73 



fine tubes, much finer than those of the spin- 

 nerets, set close together. 



They also have on the last joint but one of 

 the hind-legs a comb of stiff hairs, called the 

 calamistrum, Fig. 34, on the upper side. 



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Fig. 34- 



When they spin their peculiar web, they turn 

 one of the hind-legs across under the spin- 

 nerets, so that the calamistrum is just under 

 the cribellum, and the foot rests on the oppo- 

 site leg, Fig. 35. The hind-legs are then 



Fig. 35- 



moved rapidly back and forth ; so that the cal- 

 amistrum combs out from the spinning-tubes, 



