71 
referred  to  it.  The  three  species  may  be  distinguished  by  the  following 
characters  : 
1  pair  of  spermathecae  M.  cingulatus  Schmarda 
(Ceylon). 
3  pairs  of  spermathecae  M.  armatus  Beddard 
(Madras,  Calcutta,  Mandalay,  Singapore,  Sumatra). 
No  penial  setae  M.  coeruleus  Templeton. 
(Ceylon). 
19.  Megascolex  armatus  Beddard. 
Sumatra:  Padang,  10  specimens. 
This  species  is  very  well  known  by  the  descriptions  of  Beddard  x) 
and  Rosa  2). 
The  largest  of  our  examples  measures  about  125  mm.  in  length. 
The  cephalic  lobe  is  obtusely  triangular,  and  extends  with  a 
narrow  appendix  over  about  half  the  length  of  the  buccal  segment 
(Pl.  Ill,  fig.  31).  In  specimens,  in  a  state  of  sexual  maturity,  the 
papillae,  bearing  the  male  pores,  are  surrounded  by  an  oval  glandular 
area,  in  which  a  crescentic  groove  in  front  of  and  behind  each  pa- 
pilla is  visible  (Pl.  Ill,  fig.  32).  In  the  segments  directly  preceding  the 
clitellum  I  found  44  setae,  but  this  number  decreases  in  the  anterior 
and  posterior  segments.  There  is  a  broad  median  ventral  gap  in  the 
row  of  setae,  about  thrice  as  broad  as  the  dorsal  gap;  the  latter  one 
measures  one  and  a  half  of  the  interval  between  the  neighbouring  setae. 
The  first  dorsal  pore  lies  in  the  intersegmental  groove  XI/XII,  as 
stated  by  Posa  ;  when  Beddard  in  his  description  of  M.  cingulatus  3) 
says  „dorsal  pores  commence,  as  in  M.  armatus  between  segments  V 
and  VI",  this  must  be  a  mistake. 
There  are  in  this  species  -  as  first  pointed  out  by  Posa  and  sub- 
sequently confirmed  by  Beddard  4)  -  in  the  segments  succeeding  to 
that  containing  the  male  pores,  a  pair  of  large,  coiled  nephridia,  pro- 
vided with  an  internal  ciliated  funnel,  but  without  external  aperture  ; 
moreover  the  numerous  tufts  of  nephridial  tubules ,  characteristic  for 
the  Perichaetidae,  are  also  present;  in  the  anterior  segments  they 
are  scattered  about  irregularly  over  the  body-wall ,  in  the  posterior 
ones  I  found  them  more  confined  to  the  neighbourhood  of  the  inter- 
1)  Ann.  a.  Mag.  Nat.  Hist.  1883,  p.  216,  Pl.  VIII,  fig.  5—7. 
2)  Ann.  Mus.  Civ.  Stor.  Nat.  Genova,  Sér.  2,  Vol.  VI,  1888,  p.  159. 
3)  Loc.  cit,  1892,  p.  122,  Pl.  VII,  fig.  9—13. 
4)  Quartl.  Journ.  Microsc.  Science,  Vol.  XXIX,  p.  266. 
Penial  setae 
