77 
the  ovary  and  the  receptaculum  ovorum. 
X  90  diam. 
Fig.  21—23.  Moniligaster  sp.  from  Flores. 
Fig.  21.  The  ventral  portion  of  a  trans- 
verse section  through  segment  X.  X  36 
diam. 
Fig.  22.  A  portion  of  the  prostata-glands 
Highly  magnified. 
Fig.  23.  The  lateral  portion  of  a  transverse 
section  through  segment  XI,  to  show 
the  funnel-like  organ.  X  36  diam. 
Fig.  24—26.  Perichaeta  capensis  Horst. 
Flg.  24.  Prostata.  X  5  diam. 
Fig.  25.  Spermatheca.  X  5  diam. 
Fig.  26.  Ventral  view  of  segments  XVII 
and  XVIII.  X  4  diam. 
Fig.  27.  Perichaeta  minima  n.  sp.  Sperma- 
theca. Magnified. 
Fig.  28.  Perichaeta  sp.  from  Flores.  Sper- 
matheca. X  16  diam. 
Fig.  29.  Perichaeta  dubia  n.  sp.  Sperma- 
theca. X  6  diam. 
Fig.  30.  Perichaeta  posthuma  Vaill.  Sper- 
matheca. X  15  diam. 
Figs.  31 — 32.  Megascolex  armatus  Bedd. 
Fig.  31.  Dorsal  view  of  the  buccal  seg- 
ment. Magnified. 
Fig.    32.    Ventral    view    of  segments 
XIV— XX. 
Fig.  33.  Pontoscolex  corethrurus  Fr.  Müll. 
A  sagittal  longitudinal  section  through 
the  anterior  body-segments,  with  protu- 
ded  cephalic  extremity.  X  16  diam. 
PLATE  IV. 
Figs.  34—41.  Pontoscolex  corethrurus  Fr. 
Müll. 
Fig.  34.  Lateral  view  of  the  internal  organs 
of  the  cephalic  region  (buccal  segment 
inverted),  to  show  the  position  of  the 
mucous  gland  and  the  first  three  nephri- 
dia.  X  5  diam. 
Fig.  35.  Ventral  view  of  the  cephalic 
extremity.  Magnified. 
Fig.  36.  A  seta,  to  show  the  crescentic  rid- 
ges near  the  tip.  X  90  diam. 
Fig.  37.  An  epidermis-organ  of  the  anterior 
body-region.  Highly  magnified. 
Fig.  38.  Surface-view  of  the  body-wall  of 
the  caudal  zone,  to  show  the  bands  of 
bloodvessels.  X  20  diam. 
Fig.  39.  A  sagittal  longitudinal  section 
through  the  caudal  zone.  X  15  diam. 
Fig.  40.  A  longitudinal  section  through; the 
body-wall  of  a  segment  of  the  caudal 
zone.  X  175  diam. 
Fig.  41.  A  longitudinal  section  through  the 
body-wall  of  a  segment  in  front  of  the 
caudal  zone.  X  175  diam. 
