The Structure and Habits of Spiders. 19 



muscles extending downward through the abdo- 

 men. The markings of this spider are very- 

 complicated. The spot on the middle of the 

 front of the abdomen is a very common one, 

 and, in some spiders, extends the whole length 

 of the body. The waved lines on each side 

 are also common, and, in long-bodied spiders, 

 often form two bright-colored stripes, or rows 

 of spots, running nearly straight the whole 

 length of the abdomen. 



INTESTINE. 



Fig. 5 is a section of the same spider. 

 The mouth is at a b> just under and behind 

 the mandibles, and between the maxillae. It 

 has an upper, a, and under lip, b, each lined 

 with a horny plate, in the middle of which runs 

 a groove. When the lips are closed, the two 

 grooves form a tube, which leads to the oesopha- 

 gus, c, and so into the stomach. At the end 

 of the oesophagus is the sucking-stomach. This 

 consists of a flattened tube, to the top of which 

 is attached a muscle, d } connected with the 

 groove in the back ; and to the bottom, muscles, f, 

 attached to a tough diaphragm spreading across 



