72 
segmental  septa.  According  to  Beddaed's  and  Boukne's  observations, 
M.  coeruleus  appears  to  possess  only  the  minute  nephridial  tubules; 
as  to  M.  cingulatus,  Beddard  mentions  nothing  about  the  excretory 
system. 
Perionyx  Perrier. 
Setae  numerous,  arranged  in  a  continuous  row,  which  is  hardly 
interrupted.  Male  generative  pores  closely  approximated,  situated  in 
median  ventral  pit.  Large,  paired  nephridia.  Gizzard  rudimentary. 
Five  species  of  this  genus  are  hitherto  known;  a  sixth  one  P.  vio- 
laceus  is  described  in  the  present  paper.  They  may  be  distinguished 
by  the  following  characters: 
Penial  setae    ...  ;  P.  gruenewaUi  Mich.  l) 
(Sangir,  Java,  Sumatra). 
Two  pairs  of  (  Spermathecae 
spermatliecae    j  without  diverticulum  P.  excavatus  Perr.  2). 
(P.  MIntosUi  Bedd.) 
(Saigon,  Burmah,  Philippines,  Nias). 
No  penial  setae  <  Spermathecae 
with  a  single  diverticulum  P.  violaceus  n.  sp. 
(Java,  Sumatra). 
iEach  with  a  single  diverticulum  ....    P.  sansibaricus  Mich.  3) 
(Sansibar). 
Each  with  two  diverticula    ......    P.  saltans  Bourne.  4) 
(India). 
Four  pairs  of  spermathecae  P.  arboricola  Rosa  5) 
(Burmah). 
20.  Perionyx  violaceus  n.  sp. 
Java:  Buitenzorg,  very  common;  Tjibodas. 
Sumatra:  Singkarah,  very  common;  Manindjau;  Paninggahan,  in 
the  forest. 
The  largest  example  measures  55  mm.  in  length;  the  number  of  its 
segments  amounts  to  about  115.  The  dorsal  side  of  the  body  is  violet- 
brown  ,  except  on  the  clitellum ,  which  is  of  a  paler  colour  ;  the  ventral 
side  is  yellowish- white ,  only  the  region  in  front  of  the  clitellum  is  of 
1)  Jahrb.  Hamburg.  Wissensch.  Anstalten;  Vol.  VIII,  1891,  p.  33. 
2)  Nouv.  Arch.  Mus.  d'Hiat.  Nat.  T.  VIII,  p.  126,  Pl.  IV,  figs.  73  and  74.  Proc.  Zool. 
Society,  1886,  p.  308.  Ann.  a.  Mag.  Nat.  History,  1883,  p.  213,  Pl.  VIII,  figs.  3  and  8. 
Ann.  Mus.  Civ.  Stor.  Natur.  Genova,  2d  Ser.  Vol.  VI,  1888,  p.  157. 
3)  Jahrb.  Hamb.  Wissensch.  Anst.  Vol.  IX,  1891,  p.  4,  Pl.  I,  fig.  1. 
4)  Proc.  Zool.  Society,  1886,  p.  669. 
5)  Ann.  Mus.  Civ.  Stor.  Natur.  Genova,  2d  Ser.  Vol.  X,  1890,  p.  119,  Pl.  I,  fig.  11. 
