100 



ANNELIDA. 



Segments alternately provided with 

 soft appendages (as shield-plates, or 

 superior cirri) ; back usually covered 

 by shield-plates ; gills rudimentary ; 

 jaws ordinarily two pairs Aphroditada. 



Family I. Nereids. 



Glycera (Lamk.). No tentacular cirri ; antennas 

 rudimentary ; head conical, and scarcely distinct ; 

 proboscis ordinarily armed with four jaws. 



G. alba. Fig. 163, n. s. ; and head with proboscis protruded 



mag. 



i63 



164 



165 



106 



Pollicita (Johnst.). No tentacular cirri; antennas 

 rudimentary; body very slender; proboscis without 



