90 The Structure mid Habits of Spiders. 



The simplest form of palpal organ is found 

 in the large Mygalidce, Fig. 6. It consists of 

 a hard bulb, Fig. 46, drawn out to a point, in 

 which is a small hole leading to a sac within. 



Fig. 47. 



In most spiders the terminal joint is flat- 

 tened, and has a hollow on the under side, in 

 which the palpal organ is partly concealed. 

 The bulb is flattened to fit this hollow ; and the 

 point of it is prolonged into a distinct tube of 

 various shapes, furnished with numerous spines 



