62 MYRIAPODA 



The digestive canal is a long straight tube passing through 

 the length of the body. In the middle it is much enlarged, so 

 as to form a stomach with a glandular coat. Posterior to the 

 stomach the digestive tube receives the contents of two Mal- 

 pighian tubes which act as kidneys. 



The tracheal system consists of a single pair of stigmata on 

 the under surface of the head, and the tracheae connected with 

 them. 



Order V. Pauropoda. 



The Pauropoda, which form the fifth Order of Myriapods, are 

 as yet very imperfectly known. Pauropus was discovered by Sir 

 John Lubbock, and its discovery was announced by him in 1866. 

 He found this little Centipede in his kitchen garden among some 

 Thysanura, and at first considered it as a larval form, but 

 continued observation showed that it was a mature creature. 

 He described it as a small, white, bustling, intelligent little 

 creature about -^g inch in length. 



The antennae are very curious and highly characteristic of 

 the Order. They resemble those of Crustacea rather than those 

 of Myriapoda. Each antenna is composed in the following 

 manner. Pirst there is a shaft of four joints. From the fourth 

 joint of this shaft spring two branches ; one of these two 

 branches is narrower than the other, and ends in a long thin 

 bristle composed of a great number of joints. The other and 

 broader branch bears two such bristles, and between them a small 

 pear-shaped or globular body, the function of which is unknown. 



The mouth parts consist of two minute pairs of appendages, 

 the anterior pair toothed and the posterior pointed. The body 

 is rather narrower in front ; the segment behind the head has 

 one pair of legs, the second, third, fourth, and fifth behind the 

 head two each. The posterior legs are the longest ; the genital 

 organs open at the base of the second pair of legs, between these 

 and the third pair. The manner of breathing is as yet unknown, 

 tracheae not having been discovered. 



Pauropus at first looks most like a Chilopod, but differs from 

 that Order — 



1. In the form of the antennae. 



2. In the absence of poison claws and in the form of the 



mouth parts. 



