IQ2 



AN INTRODUCTION TO ZOOLOGY 



TABLE VI 



THE CHARACTERS OF OLIGOOLETS AND POLYOLETS CONTRASTED 



OLIGOCH^ETA 



POLYCH^TA 



No special locomotor protrusions 

 (parapodia) ; few setae. 



No other external appendages. 



Hermaphrodite. 



Development direct. 



Aquatic (fresh-water) or terrestrial. 



Parapodia ; many setae. 



External appendages in the form of 

 antennae, gills, and cirri (see Fig. 

 98). 



Sexes usually separate. 



A metamorphosis in development. 



Aquatic (marine). 



