H4 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 ( Chilognathd) 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 

 country in the rotten wood of decaying trees, and 

 when disturbed roll themselves up into balls. 



Centipedes (Chilopoda) are found under stones in 

 damp outhouses, 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. In these the four 

 segments which follow the head are united into a 

 4 basilar segment/ the second pair of whose appendages 

 are strong curved poison claws. The native forms are 

 small, but the foreign Scolopendrae are of very large 

 size and their bites are exceedingly severe. The one 

 species of Pauropus is a minute white creature found 

 among decaying leaves, with no tracheae, ten segments 

 and five-jointed antennae. 



