60 
the  white  ring,  upon  which  the  setae  are  situated,  visible  in  some 
alcohol-examples,  is  also  interrupted  on  this  point.  In  the  smaller 
examples  I  found  the  .number  of  setae  in  a  row  not  so  great  as  in 
the  larger  worms,  60  à  70  instead  of  100.  The  male  pores  lie  in  a 
line  with  the  16th  seta,  laterally  from  the  median  ventral  line;  the 
number  of  setae  between  these  pores  is  liable  to  variation. 
10.  Perichaeta  indica  Horst. 
Java:  Buitenzorg. 
Sumatra:  Singkarah,  Manindjau,  Kaju  tanam;  only  few  spe- 
cimens. 
In  my  earlier  papers  on  P.  indica  a),  dealing  with  examples  from 
Java  and  Sumatra,  an  elaborate  description  of  this  species  was  given. 
Beddard  also  mentions  specimens  from  New-Caledonia 2)  and  South- 
America  3) ,  so  this  species  appears  to  have  a  very  wide  distribution. 
It  is  presently  a  common  host  of  our  hot-houses,  being  imported 
with  tropical  plants  from  abroad.  According  to  the  observations  of 
Mr.  Fergusson  4)  however,  it  appears  only  to  be  found  in  hot-houses 
where  is  kept  up  a  temperature  of  60°,  but  never  in  any  of  the 
cooler  ones;  on  the  contrary  the  worms  should  die  out  or  disap- 
pear in  those  of  lower  temperature.  Among  the  examples,  collected 
by  Prof.  Weber  at  Singkarah ,  some  had  a  body-length  of  160  mm., 
a  dimension  never  observed  by  me  before.  The  first  dorsal  pore 
appears  to  be  situated  one  segment  more  backwards  than  in  P.  Houlleti, 
viz.  in  the  intersegmental  groove  XII /XIII,  as  also  observed  by 
Beddard.  In  none  of  the  examples,  at  my  disposal,  copulatory  papillae 
could  be  found;  however  I  my  earlier  paper  I  described  two  pairs 
of  them  on  segments  VII  and  VIII,  and  Beddard  observed  them  al- 
so on  segment  VI  in  specimens  from  New-Caledonia.  Moreover  the 
latter  author  found  in  examples  from  S.  America  „in  the  first  few  seg- 
ments of  the  body  two  specially  large  and  distinct  pairs  of  setae." 
With  regard  to  the  internal  anatomy  it  may  only  be  mentioned, 
that  some  of  our  specimens  show  at  the  duct  of  the  diverticulum 
1)  Niederl.  Arch.  f.  Zoologie,  Bd.  IV,  1879.  p.  3,  pl.  VIII.  Notes  Leyden  Museum, 
Vol.  V,  1883,  p.  186. 
2)  Proc.  Zool,  Society,  1886,  p.  298. 
3)  ibidem,  1890,  p.  57,  Pl.  IV,  fig.  1,  2  and  3. 
4)  Note  on  P.  indica  by  Rob.  Service;  Proc.  R.  Phys.  Soc.  Edinburgh.  1890,  p.  396. 
