68 
last-named  species,  from  Java  and  Borneo,  has  only  46  setae  in  seg- 
ment VIII ,  and  its  spermathecae  consist  of  a  globular  pouch  and  a 
ramous  diverticulum.  P.  quadragenaria  may  perhaps  be  identical 
with  P.  sangirensis,  but  this  cannot  be  decided,  without  examining 
the  type-specimens;  our  examples  can  in  no  case  be  identified  with 
one  of  them.  P.  minima  is  sufficiently  distinguished  by  its  small  size , 
by  the  presence  of  papillae  upon  segment  VII,  and  by  the  shape  of  its 
spermathecae. 
15.  ?  Perichaeta  sangirensis  Michaelsen. 
Sumatra:  Manindjau. 
A  small  Pm'cftaeta-specimen ,  measuring  only  27  mm.  in  length,  was 
collected  at  Manindjau.  There'  are  two  pores  of  spermathecae  visible 
in  the  intersegmental  groove  VII/VIII.  The  spermathecae,  situated 
in  segment  VIII,  consist  of  a  globular  sac,  with  a  rather  long,  mus- 
cular, excretory  duct  and  of  a  pyriform  diverticulum,  communicating 
with  the  main  sac  by  a  short,  non-coiled  duct.  The  8th  and  9th 
intersegmental  septa  appear  to  be  absent.  The  prostata-glands  are  not 
well  developed.  Perhaps  the  specimen  is  identical  with  P.  sangirensis, 
one  of  the  malayan  species ,  with  only  a  single  pair  of  spermathecae  ; 
the  other  ones  (P.  quadragenaria  and  P.  racemosa)  having  a  diver- 
ticulum of  quite  another  appearance. 
16.  Perichaeta  dubia  n.  sp. 
Sumatra:  Mount  Singalang,  five  specimens;  Paninggahan,  in 
the  forest,  three  specimens. 
Among  the  Perichaetidae ,  collected  in  Sumatra,  there  are  some 
specimens,  which,  though  agreeing  with  P.  Houlleti  in  the  number 
of  spermathecae  (four  pairs)  cannot  be  referred  to  this  species ,  because 
their  spermathecae  do  not  show  the  characteristic  appendicles,  and 
the  clitellum  wants  the  peculiar  rudimentary  setae. 
The  largest  of  the  examples,  collected  in  the  Paninggahan-forest , 
measures  140  mm.  in  length  ;  the  number  of  its  segments  amounts  to 
about  120.  The  cephalic  lobe  extends  nearly  to  the  middle  of  the 
buccal  segment.  First  dorsal  pore  in  the  intersegmental  groove  XII/XIII. 
The  apertures  of  the  spermathecae  are  very  obvious ,  situated  in  the 
intersegmental  grooves  of  segment  VI/VII,  VII/VIII  and  VIII/IX, 
and  are  surrounded  by  a  white,  glandular  area. 
