268 



POLYGORDIUS 



/ 



FIG. 68. 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 

 (/), with setre (s) and ciliated pit (c. p). 



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



D, portion of body showing metameres (Mtmr) separated by grooves 



(gr). 



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

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

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

 (After Fraipont.) 



(Mfmr), the number of which varies considerably. Poly- 

 gordius is thus the first instance we have met with of a trans- 



