rr.at 



Fig, 66. — Polygordius neapolitanus. 



A, the living animal, dorsal aspect, about five times natural size. 



B, anterior end of the worm from the right side, more highly magni- 

 fied, showing the prostomium {Pr. st), peristomium (Per. st), tentacles 

 (t), with setK {s) and ciliated pit {c. p). 



c, ventral aspect of the same : letters as before except Mth, mouth. 



D, portion of body showing metameres {Mtnir) separated by grooves 



E, posterior extremity from the ventral aspect, showing the last three 

 metameres (Mtmr) separated by distinct grooves (gr), the anal seg- 

 ment (An. seg) bearing the anus (An), and a circlet of papillae (/). 

 (After Fraipont.) 



