39 



POLYCKflETA 



POLYCHJETA. 



1. Dorsal view of head of Nereis. Prgestomium, with eyes, tentacles and palps; tentacular cirri 

 (cirri of ist and 2nd segments fused with head). 



2. Parapodium of Nereis. Notopodium and neuropodium, each with two or three lobes ; 

 notopodial cirrus; neuropodial cirrus; acicula; setae. 



3. Heteronereis (sexual) form. Enlarged eyes : modified posterior segments. 



4. Parapodium of Heteronereis form : flattened expansions of parapodia : oar-shaped setse. 



