The Structure and Habits of Spiders. 91 



and appendages. Fig. 47 is the palpal organ of 

 Epeira vulgaris flattened out, and made trans- 

 parent. The internal sac is shown at a ; and 

 the tube from it b runs round the inside of 

 the bulb, and ends at the opening c. The out- 

 side of the organ has various horns and append- 

 ages. Fig. 48 is the palpus of another spider, 



Fig. 48. 



where the outer tube is so long, that it is coiled 

 up over the basal part of the bulb ; and the end 

 rests on a strong spine at one side of the palpus. 

 Not only the terminal joints of the palpi, but 

 also the next, and sometimes next two joints, 

 are modified in shape, with the development of 



