﻿318 
  W. 
  BLAXLAND 
  BENHAM. 
  

  

  12. 
  Goodrich. 
  — 
  ' 
  Quart. 
  Journ. 
  Micr. 
  Sci.,' 
  vols, 
  xl, 
  xli, 
  xliii. 
  

  

  13. 
  RouLE.— 
  ' 
  Ann. 
  Sci. 
  Nat.' 
  (Zool.), 
  ser, 
  7, 
  vol. 
  vii. 
  

  

  14. 
  Stolc— 
  'G. 
  B. 
  Bohm. 
  Gesel.,' 
  1889 
  (abstracted 
  by 
  Beddard, 
  loc. 
  cit. 
  

  

  supra). 
  

  

  15. 
  Vejdovsky. 
  — 
  ' 
  Sjst. 
  u. 
  Morph. 
  Oligochaet.' 
  

  

  16. 
  Vejdovsky. 
  — 
  'Entwick. 
  Untersuch.' 
  

  

  17. 
  Wilson. 
  — 
  'Journ. 
  Morph.,' 
  vol. 
  iii, 
  p. 
  419. 
  

  

  EXPLANATION 
  OF 
  PLATES 
  16—18, 
  

  

  Illustrating 
  Dr. 
  W. 
  Blaxland 
  Benham's 
  paper, 
  " 
  On 
  a 
  New 
  

   Species 
  of 
  the 
  Genus 
  Haplotaxis; 
  witli 
  Remarks 
  on 
  the 
  

   Genital 
  Ducts 
  of 
  the 
  OligochEeta." 
  

  

  Reference 
  Letters. 
  

  

  br. 
  Cerebral 
  ganglion, 
  b.w. 
  Body-wall. 
  c.c. 
  Coelomic 
  corpuscles, 
  c.ep. 
  

   Coelomic 
  epithelium, 
  c. 
  m. 
  Circular 
  muscles, 
  cu. 
  Cuticle, 
  d. 
  Dorsal 
  chsela. 
  

   d.v. 
  Dorsal 
  blood-vessel, 
  ep. 
  Epidermis 
  or 
  epithelium, 
  ff. 
  Gizzard, 
  ffl. 
  

   Copulatory 
  gland 
  or 
  its 
  external 
  opening, 
  int. 
  Intestine. 
  I. 
  Lateral 
  line. 
  

   l.m. 
  Longitudinal 
  muscles 
  of 
  body-wall 
  or 
  other 
  organ, 
  ni. 
  Muscle-fibres. 
  

   «i. 
  ch. 
  Muscles 
  of 
  chseta. 
  n. 
  Nucleus. 
  «. 
  c. 
  Ventral 
  nerve-cord. 
  ne. 
  Ne- 
  

   phridium. 
  tie. 
  d. 
  Nephridial 
  duct. 
  tie. 
  o. 
  Position 
  of 
  nephridiopore. 
  n./^ 
  

   Nephridial 
  funnel, 
  o. 
  Ovum. 
  o. 
  d. 
  Oviduct, 
  ce. 
  CEsophagus. 
  o./. 
  Ovi- 
  

   ducal 
  funnel, 
  ov. 
  Ovary, 
  ov. 
  s. 
  Ovisac, 
  p. 
  Lateral 
  prominence 
  outside 
  

   ovipore. 
  s. 
  Septum, 
  s. 
  c. 
  Circle 
  of 
  sensory 
  cells 
  surrounding 
  a 
  segment. 
  

   sp. 
  Spermatozoa, 
  sp. 
  d. 
  Sperm-duct, 
  sp.f, 
  Spermiducal 
  funnel, 
  sp. 
  s. 
  

   Sperm-sac. 
  spth. 
  Spermatheca 
  or 
  its 
  aperture, 
  t. 
  Testis, 
  v. 
  Ventral 
  

   chseta. 
  v. 
  v. 
  Ventral 
  blood-vessel. 
  (^ 
  Male 
  pore. 
  $ 
  Eemale 
  pore. 
  

  

  PLATE 
  16. 
  

  

  Fig. 
  1. 
  — 
  View 
  of 
  the 
  anterior 
  extremity 
  of 
  a 
  mature 
  specimen 
  of 
  Haplo- 
  

   taxis 
  heterogyne 
  stained 
  and 
  mounted 
  in 
  Canada 
  balsam. 
  (Camera, 
  

   X 
  40.) 
  In 
  the 
  anterior 
  segments 
  the 
  circular 
  segmental 
  series 
  of 
  sensory 
  

   cells 
  are 
  shown 
  ; 
  further 
  back 
  these 
  are 
  indicated 
  in 
  the 
  optical 
  section 
  of 
  the 
  

   body-wall. 
  The 
  extreme 
  dilatation 
  of 
  Segments 
  XIII 
  and 
  XIV 
  is 
  partly 
  due 
  

   to 
  compression. 
  The 
  small 
  size 
  of 
  the 
  intestine 
  in 
  the 
  genital 
  segments 
  is 
  

   shown. 
  0. 
  d. 
  is 
  the 
  funnel 
  of 
  the 
  oviduct. 
  

  

  Fig. 
  2. 
  — 
  A 
  transverse 
  section 
  across 
  the 
  gizzard. 
  (Camera, 
  x 
  500.) 
  The 
  

  

  