The Structure and Habits of Spiders. 39 



SPINNERETS. 



The external spinning-organs are little two- 

 jointed tubes on the ends of the spinnerets, Fig. 

 I, L. Fig. 16 is the spinnerets of the same spi- 

 der, still more enlarged to show the arrangement 

 of the tubes. There is a large number of little 



Fig. 16. 



tubes on each spinneret, and in certain places 

 a few larger ones. Fig. 17 is a single tube, 

 showing the ducta which leads the viscid liquid 

 to form the thread from a gland in the spider's 



