ARTHROPOD A. 



89 



Subclass VI. PODOSOMATA. 



PYCNOGONIDA. NYMPHONACEA. ARACHNOPODA. PANTOPODA. 

 ARANEIFORMIA. APOROBRANCHIA. POLYGONOPODA. L.EVIGRADA. 



No respiratory organs. Abdomen rudimentary, unsegmented. 

 Thorax of four segments, each carrying a pair of many-jointed 

 legs. Sexes distinct. 



