1 14 Invertebrata. 



sometimes provided with little processes. One curious 

 group has no tracheae. 



Many of these centipedes have minute pear-shaped 

 glands placed along the sides, which secrete a brown 

 irritating fluid, emitting a disagreeable odour. 



There are more than twenty segments in the body 

 (except in one little species), and each bears one or 

 two pairs of legs, all with six or seven joints like those 

 of a spider or crustacean ; each limb terminates in 

 one or two claws. 



Subdivisions. There are three orders of these 

 animals, millepedes, centipedes, and pauropods. 

 Millepedes possess two pairs of limbs on most of their 

 segments, a condition due to the union of the true 

 segments in pairs. They have also small antennae 

 of seven joints and tracheal openings in front of the 

 articulation of each leg. They are found in this coun- 

 try in the rotten wood of decaying trees, and when 

 disturbed roll themselves up into balls. 



Centipedes are found under stones in damp out- 

 houses, or in rotten palings. They have but one pair 

 of limbs on each joint of the body, and never more 

 than one pair of stigmata. The native forms are small, 

 but the tropical Scolopendrae are of very large size and 

 their bites are exceedingly severe. The one species 

 of Pauropus is a minute white creature found in 

 decaying leaves, with no tracheae, ten segments and 

 five-jointed antennae. 



