44 
spermatoblasts;  on  the  contrary  mature  eggs  were  already  present 
in  the  ovaria  and  also  in  the  receptacula  ovorum. 
This  species  distinguishes  itself  from  all  earthworms,  hitherto 
described,  by  having  its  male  pores  situated  so  far  backwards  as 
segment  XXVIII.  In  this  regard  it  only  bears  some  resemblance  to 
Kynotus  madagascariensis ,  described  by  Michaelsen,  which  has  its 
male  pores  situated  upon  segment  XXV.  Though  this  species  too  pos- 
sesses a  great  number  of  spermathecae  like  as  Glyphidrilus  Weber  i,  it, 
by  its  other  characters  —  the  incongruence  of  external  and  internal 
segmentation,  the  small  laterally  placed  setae,  the  bursa  propulsatoria 
etc.  -  differs  so  entirely  from  our  species,  that  it  appears  rather 
dubious  to  me,  whether  both  genera  really  are  allied  to  each  other ,  as 
suggested  by  Miohaelsen.  In  Diachaeta  too  the  male  pores  are  rather 
far  remoted  from  the  oral  extremity  (XXII),  and  the  setae  are 
separated  from  each  other  by  considerable  intervals  ;  this  genus  however 
does  not  possess  a  prostate-gland  in  connection  with  the  male  pores, 
as  occurs  in  Glyphidrilus. 
Annadrilus  n.  g. 
Setae  of  the  common  shape,  arranged  in  four  series  of  couples. 
Clitellum  provided  on  each  side  with  a  folded,  crenulated  ridge.  Two 
pairs  of  testes  in  segments  X  and  XI  ;  vasa  deferentia  opening  in  the 
intersegmental  groove  of  segment  XXI  and  XXII,  not  provided  with 
a  prostate-gland.  Ovaries  in  segment  XIII;  oviducal  pores  upon  segment 
XIV.  Small  spermathecae,  more  than  one  pair  in  each  segment. 
5.  Annadrilus  quadrangulus  n.  sp. 
Sumatra:  in  the  lake,  called  Danau  di  atas,  in  the  neighbourhood 
of  Alahan  Pandjang,  six  specimens. 
A  small  worm,  in  its  external  appearance  much  resembling  Gly- 
phidrilus. Its  anterior  body-region  is  cylindrical ,  the  posterior  segments 
are  quadrangular.  The  tail  is  rather  pointed,  and  the  anal  opening  lies 
dorsally.  The  length  of  the  largest  specimen  is  50  mm.;  the  number 
of  its  segments  amounts  to  about  200.  The  individuals  are  totally 
discoloured. 
The  cephalic  lobe  is  obtusely  triangular,  not  narrowing  posteri- 
orly, with  its  convex  posterior  margin  extending  over  a  third  of  the 
buccal  segment.  The  longitudinal  diameter  of  the  anterior  segments  is 
longer  than  that  of  the  posterior  ones. 
