THE CONQUEST OF THE DRY LAND 195 



papillae tiny jets of slime, and it is believed to 

 do this also as a means of catching small insects. 

 Peripatus is of great interest to naturalists, 

 because in some important respects it resembles 

 a worm, while, in others, especially in the posses- 

 sion of breathing-tubes, it has risen to a higher 

 level, and shows relationship with insects. It 

 must be very well adapted to its mode of life, 

 for it is very widespread in warm countries, 

 being found, with slight differences between 



FIG. 20. A CENTIPEDE. 



the species, in Central America, the West 

 Indies, in Chili, in New Zealand and Australia, 

 in Asia, in Central Africa, and at the Cape of 

 Good Hope. 



The second great invasion led on to centi- 

 pedes, millipedes, insects, and spiders, and just 

 as the worm-invasion resulted in the making of 

 fertile soil, so the second invasion had for its 

 great consequence the establishing of a linkage 

 between flowering plants and the flower-visiting 



