CHAPTER XVII. 



TRACHEATA. 



PROTOTRACHEATA. 

 THE remarkable researches of Moseley (No. 396) on Peripatus 



FIG. 167. ADULT EXAMPLE OF PERIPATUS CAPENSIS, natural size. 

 (From Moseley.) 



capensis have brought clearly to light the affinities of this form 

 with the tracheate Arthropoda ; and its numerous primitive 



FIG. 168. Two STAGES IN THE DEVELOPMENT OF PERIPATUS CAPENSIS. 

 (After Moseley.) 



A. Youngest stage hitherto observed before the appearance of the legs. 



B. Later stage after the legs and antennre have become developed. 

 Both figures represent the larva as it appears within the egg. 



i and 2. First and second post-oral appendages. 



characters, such as the generally distributed tracheal apertures, 

 the imperfectly segmented limbs, the diverging ventral nerve 



