15° 



MANUAL OF ZOOLOGY 



bodies, the penial setce {p?i.'s). In the female the repro- 

 ductive aperture or gonopore is separated from the anus, and 



68 . 

 ° -Si 



Eli 







■2 i>" - 

 S3" 5 8 



i o a 

 »•■? «i 3 



is situated on the ventral surface about one-third of the 

 length of the body from the anterior end (Fig. 82, gnp). 



The outer surface of the body is furnished by a delicate, 

 transparent, elastic membrane, of a chitinoid nature, the 



