﻿SOME 
  NKW 
  SPECIES 
  OF 
  THE 
  GENUS 
  PHREODIJILUS. 
  281 
  

  

  Phreodrilus 
  brddaedi, 
  n. 
  sp. 
  

  

  While 
  Avorkiiig- 
  on 
  the 
  previous 
  species 
  I 
  was 
  naturally 
  

   led 
  to 
  institute 
  comparisons 
  with 
  the 
  male 
  efferent 
  apparatus 
  

   in 
  P. 
  subterraneus. 
  I 
  was 
  puzzled 
  to 
  account 
  for 
  the 
  

   great 
  differences 
  that 
  exist 
  between 
  the 
  complicated 
  arrange- 
  

   ment 
  as 
  described 
  and 
  figured 
  by 
  Beddard 
  and 
  the 
  much 
  

   simpler 
  condition 
  of 
  the 
  organ 
  in 
  P. 
  lacustris. 
  

  

  In 
  P. 
  subterran 
  ens 
  Beddard 
  (1, 
  2) 
  describes 
  the 
  apparatus 
  

   essentially 
  as 
  follows^ 
  : 
  — 
  The 
  vas 
  deferens, 
  after 
  a 
  few 
  simple 
  

   convolutions, 
  unites 
  with 
  a 
  "blind 
  diverticulum" 
  of 
  glandu- 
  

   lar 
  structure, 
  and 
  the 
  common 
  duct 
  thus 
  formed 
  is 
  very 
  

   much 
  convoluted- 
  — 
  at 
  first 
  a 
  narrow 
  tube 
  agreeing 
  in 
  struc- 
  

   ture 
  with 
  the 
  vas 
  deferens, 
  it 
  later 
  becomes 
  much 
  wider 
  and 
  

   different 
  in 
  structure 
  ; 
  this 
  tube 
  opens 
  externally 
  without 
  

   any 
  penis. 
  But 
  this 
  highly 
  convoluted 
  common 
  duct 
  is 
  en- 
  

   closed 
  in 
  a 
  peculiar 
  muscular 
  sac 
  — 
  the 
  ''atrial 
  sac," 
  — 
  the 
  wall 
  

   of 
  which 
  is 
  over 
  a 
  considerable 
  distance 
  separated 
  from 
  the 
  

   wall 
  of 
  the 
  contained 
  tube, 
  but 
  towards 
  the 
  external 
  pore 
  

   becomes 
  adherent 
  to 
  the 
  latter. 
  In 
  the 
  closed 
  space 
  thus 
  

   formed 
  Beddard 
  finds 
  loose 
  " 
  ripe 
  spermatozoa," 
  together 
  

   with 
  " 
  free 
  nuclei," 
  which 
  have, 
  according 
  to 
  him, 
  no 
  relation 
  

   to 
  the 
  "sperms." 
  

  

  Both 
  the 
  vas 
  deferens 
  and 
  the 
  " 
  blind 
  diverticulum 
  " 
  per- 
  

   forate 
  the 
  wall 
  of 
  the 
  atrial 
  sac 
  near 
  its 
  upper 
  end. 
  The 
  

   lower 
  extremity 
  of 
  the 
  atrial 
  sac, 
  where 
  its 
  wall 
  adheres 
  

   to 
  the 
  duct 
  within, 
  is 
  bent 
  upon 
  the 
  previous 
  region, 
  and 
  

   perforates 
  the 
  body-wall 
  without 
  giving 
  rise 
  to 
  any 
  penial 
  

   structure. 
  

  

  The 
  arrangement 
  in 
  the 
  species 
  (P. 
  lacustris) 
  that 
  I 
  was 
  

   studying 
  at 
  the 
  time 
  agrees 
  closely 
  with 
  the 
  male 
  apparatus 
  

   of 
  certain 
  South 
  American 
  and 
  Falkland 
  Island 
  worms 
  de- 
  

   scribed 
  by 
  Beddard 
  under 
  the 
  generic 
  title 
  Hesperodrilus; 
  

   and 
  with 
  some 
  of 
  the 
  species, 
  P. 
  albus 
  and 
  P. 
  niger, 
  my 
  

   species 
  presents 
  several 
  other 
  points 
  of 
  agreement 
  (as 
  noted 
  

   in 
  the 
  above 
  account). 
  While 
  thus 
  engaged 
  I 
  received 
  Dr. 
  

   1 
  I 
  do 
  not 
  quote 
  his 
  own 
  words. 
  

  

  