144  DE.  T.  WILLIAMS  ON  THE  EEPEODIJCTIVE  OEGANS  OE  THE  ANNELIDS. 
Fig.  27.  Two  organs  from  the  Polynoe  semisquamosa : — A,  female ; B,  male : they  are 
simple  branched  cseca,  commencing  at  a single  (double  1)  orifice,  a,  a ; c.  en- 
larged view  of  ovarian  tube ; d,  enlarged  view  of  sperm-tube. 
Fig.  28.  Male  and  female  segmental  organs  oiAphrodita  aculeata: — A,  female;  B,  male; 
a A,  and  a B,  ciliated  dilated  attached  ends ; 5,  branches ; d,  one  of  the 
branches  of  the  ovarian  organ  enlarged ; e,  bridle  at  one  end ; (Z  B,  a portion 
of  the  sperm-tube  enlarged. 
