﻿new 
  Species 
  o/Polytoreutus. 
  509 
  

  

  in 
  Polytoreutus 
  ruwenzom, 
  Bed 
  J., 
  and 
  P. 
  yranti, 
  Bedd. 
  j 
  but 
  

   in 
  tliese 
  two 
  species 
  the 
  right 
  sperm-sac 
  is 
  longer 
  than 
  the 
  

   left. 
  

  

  The 
  sperm-ducts 
  run 
  backwards 
  against 
  the 
  ventral 
  body- 
  

   wall 
  till 
  they 
  reach 
  the 
  prostates 
  near 
  to 
  the 
  male 
  pore 
  

   (rig. 
  A, 
  s.d., 
  pr.). 
  The 
  prostates 
  are 
  oblong 
  and 
  irregularly 
  

   moniliform, 
  and 
  they 
  appear 
  of 
  a 
  yellowish 
  colour. 
  They 
  

   extend 
  from 
  intersegmental 
  furrow 
  xvii.-xviii. 
  to 
  the 
  xxvi. 
  

   segment, 
  and 
  pass 
  from 
  the 
  ventral 
  to 
  the 
  dorsal 
  region 
  of 
  

   the 
  body. 
  A 
  distal 
  muscular 
  duct 
  is 
  not 
  distinguishable; 
  

   a 
  strong 
  bursa 
  propulsoria 
  in 
  relation 
  with 
  the 
  male 
  pore 
  

   is 
  wanting 
  (tig. 
  A, 
  p>\). 
  

  

  A 
  pair 
  of 
  nearly 
  globose 
  shortly 
  stalked 
  egg-sacs 
  depends 
  

   in 
  the 
  ventral 
  region 
  from 
  the 
  posterior 
  surface 
  of 
  the 
  very 
  

   thin 
  septum 
  xiii.-xiv. 
  (rigs. 
  A 
  and 
  B, 
  e.s.). 
  The 
  stalk 
  of 
  

   each 
  egg-sac 
  extends 
  laterally 
  into 
  the 
  rectilinear 
  oviduct 
  

   (o.d.) 
  } 
  and 
  in 
  the 
  opposite 
  direction 
  it 
  passes 
  into 
  a 
  duct, 
  

   which 
  is 
  a 
  prolongation 
  of 
  the 
  oviduct 
  itself, 
  and 
  which 
  opens 
  

   out 
  into 
  one 
  of 
  the 
  anterior 
  diverticula 
  of 
  the 
  spermatheca 
  

   {div.) 
  after 
  it 
  has 
  described 
  a 
  short 
  spiral 
  line. 
  This 
  duct 
  is 
  

   provided, 
  at 
  the 
  extremity 
  which 
  opens 
  into 
  the 
  spermathecal 
  

   diverticulum, 
  with 
  a 
  little 
  globular 
  lateral 
  appendix 
  (app.). 
  

   A 
  small 
  egg-capsule, 
  or 
  "Ovarialblase," 
  is 
  present 
  at 
  the 
  distal 
  

   extremity 
  of 
  this 
  duct, 
  where 
  the 
  egg-sac 
  opens 
  into 
  it 
  {ex.). 
  

   This 
  egg-capsule 
  is 
  fastened 
  in 
  the 
  xiii. 
  segment 
  by 
  a 
  short 
  

   ligament 
  (//.). 
  

  

  The 
  spermatheca 
  is 
  anteriorly 
  bicornuous, 
  i. 
  e. 
  it 
  is 
  divided 
  

   into 
  two 
  oblong 
  diverticula, 
  which 
  lie 
  in 
  the 
  xiii. 
  segment, 
  

   and 
  extends 
  dorsally 
  around 
  the 
  oesophagus 
  and 
  calciferous 
  

   glands 
  (tig. 
  A, 
  div.). 
  

  

  The 
  unpaired 
  ventral 
  median 
  spermathecal 
  sac 
  underlies 
  

   the 
  nerve-cord, 
  and 
  is 
  compressed 
  against 
  the 
  body-wall. 
  

   In 
  the 
  two 
  most 
  anterior 
  thirds 
  it 
  appears 
  more 
  dilated 
  

   than 
  near 
  the 
  spermathecal 
  pore. 
  Corresponding 
  to 
  septa 
  

   xv.-xvi. 
  and 
  xvi.-xvii., 
  which 
  are 
  traversed, 
  it 
  shows 
  two 
  

   constiictions, 
  which 
  form 
  three 
  pairs 
  of 
  rudimentary 
  lateral 
  

   diverticula 
  that 
  lie 
  in 
  segments 
  xv., 
  xvi., 
  and 
  xvii. 
  In 
  the 
  

   xviii. 
  segment 
  the 
  distal 
  portion 
  of 
  the 
  spermatheca 
  is 
  thin- 
  

   walled 
  and 
  reaches 
  direct 
  to 
  the 
  external 
  pore 
  («.P.). 
  

   There 
  is 
  no 
  muscular 
  chamber 
  to 
  this 
  pore. 
  

  

  Hab. 
  ? 
  Naii 
  obi, 
  British 
  East 
  Africa. 
  

  

  Polytoreutus 
  baralypton 
  is 
  well 
  distinguished 
  from 
  other 
  

   species 
  of 
  the 
  genus 
  by 
  several 
  important 
  characters, 
  viz. 
  : 
  the 
  

   absence 
  of 
  muscular 
  chambers 
  to 
  the 
  male 
  and 
  spermathecal 
  

   pores, 
  the 
  number 
  and 
  arrangement 
  of 
  the 
  spermathecal 
  

   diverticula, 
  &c. 
  

  

  