﻿SOME 
  NEW 
  SPECIES 
  OP 
  THE 
  GENUS 
  PHREODRILIJS. 
  283 
  

  

  later 
  paper 
  describing 
  species 
  of 
  Hesperodrilus 
  this 
  ab- 
  

   sence 
  is 
  noted. 
  It 
  seems 
  likely 
  that 
  a 
  re-examination 
  of 
  the 
  

   species 
  will 
  show 
  that 
  it 
  agrees 
  with 
  the 
  rest 
  on 
  this 
  point. 
  

  

  As 
  a 
  rule 
  a 
  single 
  chseta 
  alone 
  projects, 
  but 
  its 
  base 
  is 
  

   supported 
  by 
  a 
  couple 
  of 
  minute 
  bristles 
  within 
  the 
  follicle 
  ; 
  

   and 
  here 
  and 
  there 
  I 
  note 
  that 
  one 
  of 
  these 
  smaller 
  chaetse 
  

   are 
  elongated, 
  and 
  though 
  not 
  attaining 
  the 
  length 
  of 
  the 
  

   normal 
  one, 
  yet 
  project 
  some 
  distance 
  alongside 
  of 
  it. 
  

  

  The 
  ventral 
  chaetee 
  agree 
  precisely 
  with 
  the 
  account 
  given 
  

   by 
  Mr. 
  Beddard 
  ; 
  there 
  is 
  no 
  trace 
  of 
  a 
  " 
  tooth 
  " 
  on 
  the 
  con- 
  

   vex 
  side, 
  such 
  as 
  exists 
  in 
  most 
  of 
  the 
  other 
  species 
  of 
  this 
  

   genus, 
  and 
  in 
  this 
  respect 
  the 
  worm 
  agrees 
  with 
  P. 
  kergue- 
  

   1 
  en 
  en 
  sis. 
  In 
  the 
  anterior 
  segments 
  the 
  chastaa 
  are 
  pointed, 
  

   but 
  posteriorly 
  this 
  point 
  is 
  in 
  many 
  cases 
  worn 
  down, 
  so 
  that 
  

   the 
  bristle 
  terminates 
  bluntly. 
  The 
  length 
  of 
  the 
  ventral 
  

   chaetae 
  is 
  0'3 
  mm. 
  

  

  The 
  clitellum 
  (fig. 
  12) 
  is 
  fully 
  developed, 
  and 
  is 
  confined 
  

   to 
  Segment 
  XIII, 
  with 
  a 
  sharply 
  marked 
  margin 
  anteriorly 
  

   and 
  posteriorly, 
  but 
  svhen 
  viewed 
  under 
  a 
  lens 
  the 
  body-wall 
  

   of 
  Segments 
  XI 
  and 
  XII 
  also 
  appear 
  opaque 
  ; 
  when 
  bisected, 
  

   however, 
  and 
  the 
  cut 
  wall 
  examined, 
  the 
  epidermis 
  in 
  Seg- 
  

   ment 
  XIII 
  is 
  seen 
  to 
  be 
  very 
  much 
  thicker 
  than 
  that 
  of 
  the 
  

   neighbouring 
  segments. 
  

  

  The 
  male 
  pore, 
  situated 
  close 
  to 
  the 
  hinder 
  margin 
  of 
  

   Segment 
  XII, 
  is 
  carried 
  on 
  a 
  slightly 
  everted 
  papilla, 
  in 
  line 
  

   with 
  the 
  ventral 
  chaetao, 
  which 
  are 
  absent 
  in 
  this 
  segment 
  

   (fig. 
  13). 
  In 
  the 
  foot-note 
  on 
  page 
  290 
  of 
  his 
  memoir 
  Beddard 
  

   records 
  that 
  in 
  a 
  mature 
  specimen 
  " 
  one 
  of 
  the 
  segments 
  in 
  

   the 
  neighbourhood 
  of 
  the 
  thirteenth 
  was 
  furnished 
  with 
  a 
  pair 
  

   of 
  tubular 
  processes." 
  This 
  I 
  take 
  to 
  be 
  the 
  penial 
  sac 
  

   referred 
  to 
  below. 
  

  

  The 
  spermathecal 
  pore 
  is, 
  under 
  the 
  lens, 
  a 
  very 
  noticeable 
  

   vertical 
  slit 
  with 
  distinct 
  cuticulated 
  margin, 
  situated 
  near 
  

   the 
  anterior 
  edge 
  of 
  Segment 
  XIII, 
  in 
  line 
  with 
  the 
  dorsal 
  

   chaetae 
  (here 
  absent), 
  as 
  Beddard 
  stated 
  to 
  be 
  the 
  case 
  in 
  

   P. 
  subterraneus. 
  Though 
  the 
  dorsal 
  chaetae 
  are 
  absent, 
  

   the 
  chaetigerous 
  sac 
  persists 
  (fig. 
  12, 
  d'). 
  The 
  figure, 
  13 
  of 
  

  

  