268 



CLASSIFICATION OF ANIMALS 



for the degenerated condition of many organs. The body is worm-like 

 and the appendages are reduced to two pairs of hooks. 



573. Class 6. Protracheata. — This group is of interest as 

 forming a connecting link between the annelids and insects. 



Fig. 156. — The trap-door spider. X i. 



There are only a few species, which are not common but are 

 found in widely separated parts of the globe. The animals are 

 small, worm-like, and are found in damp places under stones, 

 decaying wood or other similar situations. The body is worm- 





Fig. 157, — Pcripatus capensis, an example of the class Protracheata. 



(From Galloway, after Moscley.) 



like and provided with short feet somewhat Hke the false feet 

 of a caterpillar but provided with claws. There is one pair of 

 tentacles and a pair of eyes. There are two pairs of appendages 

 in the region of the mouth. The respiratory organs are tracheae 

 with stigmata scattered irregularly over the surface of the body. 



