470 



ANNELIDA. 



develop a head, but as a rule it develops a head, and is then known, 

 according to the characters of the head, as the Tetraglena, Chaeto- 

 syllis, Syllis arnica, or loda. 



In Autolytus (Fig. 375, ///) the process is still more complicated, 



S66 



FIG. 376. Myrianida fusciata. 1, sexless budding form with a chain of 29 budded sexual 

 forms. 2, male form produced by budding, and called Polybostrichus. 3, a female form, 

 called Sacconereis. am unpaired antenna ; al lateral antennae ; ap posterior lateral antennae ; 

 ri,"es, ct tentacular cirri ; cp terminal cirri ; erf dorsal cirri ; Se sexless zooid ; so ovigerous 

 sac ; y, y' eyes^(after Malaquin, from Perrier). 



