Class 2. ONYCHOPHORA. Tracheates with a soft skin, paired segmental nephridia and numerous similar leg-bearing 

 segments. The head is not marked off from the body and bears one pair of antennae, one pair of 

 jaws and one of oral papillae. Tracheal stigmata diffusely scattered. Muscular fibres unstriated. 

 Ex. Peripatus. 



