﻿294 
  W. 
  B 
  LAX 
  LAND 
  BEN 
  HAM. 
  

  

  retractors 
  {t. 
  on.), 
  and 
  perhaps 
  tlie 
  spiral 
  muscles 
  covering 
  

   the 
  atrium 
  derived 
  from 
  the 
  radiating 
  fibres 
  (r. 
  m.) 
  which 
  

   connect 
  it 
  with 
  the 
  wall 
  of 
  the 
  atrial 
  sac 
  serve 
  to 
  retract 
  the 
  

   penis. 
  

  

  Dunedin, 
  April 
  11, 
  1903. 
  

  

  Literature. 
  

  

  1. 
  Beddard, 
  F. 
  E. 
  — 
  "Abstract 
  of 
  some 
  Investigations 
  into 
  the 
  Structure 
  of 
  

  

  the 
  Oligochseta," 
  'Ann. 
  Mag. 
  Nat. 
  Hist.,' 
  1891, 
  p. 
  88 
  ; 
  Phreodrilus, 
  

   p. 
  92 
  

  

  2. 
  Beddaru, 
  F. 
  E. 
  — 
  "Anatomical 
  Description 
  of 
  Two 
  New 
  Genera 
  of 
  

  

  Aquatic 
  Oligociiseta," 
  ' 
  Trans. 
  Roy. 
  Soc. 
  Edinb.,' 
  xxxvi, 
  p. 
  273. 
  

  

  3. 
  Beddard, 
  F. 
  E. 
  — 
  "Prel. 
  Notice 
  of 
  South 
  American 
  Tubificids, 
  etc.," 
  

  

  ' 
  Ann. 
  Mag. 
  Nat. 
  Hist.,' 
  1894 
  (0), 
  xiii, 
  p. 
  205. 
  

  

  4. 
  Beddakd, 
  F. 
  E. 
  — 
  "Naiden, 
  Tubificiden, 
  und 
  Terricolen," 
  'Hamburg. 
  

  

  Maghal. 
  Sammeheise,' 
  1896. 
  

  

  5. 
  Michaelsen,W.— 
  "DieOligochset. 
  d.Deutsch.TierseeExped.,'"Wissenscli. 
  

  

  Ergebn., 
  etc.,' 
  1902, 
  p. 
  133. 
  

  

  EXPLANATION 
  OF 
  PLATES 
  13—15, 
  

  

  Illustrating 
  Mr. 
  W. 
  Blaxland 
  Benham^s 
  paper 
  " 
  On 
  some 
  

   New 
  Species 
  of 
  the 
  Genus 
  Phreodrilus." 
  

  

  Letters 
  Employed 
  in 
  the 
  Figures. 
  

  

  a. 
  Muscular 
  duct 
  of 
  spennatheca. 
  al. 
  Atrium, 
  either 
  its 
  wall 
  or 
  cavity. 
  

   als. 
  Atrial 
  sac, 
  either 
  its 
  wall 
  or 
  cavity. 
  6. 
  Glandular 
  portion 
  of 
  duct 
  of 
  

   spermatheca. 
  c. 
  Ampulla 
  of 
  sperniatheca. 
  c. 
  e. 
  Ccelomic 
  epithelium, 
  or 
  its 
  

   nuclei, 
  c. 
  m. 
  Circular 
  muscle, 
  whether 
  of 
  body-wall 
  or 
  atrial 
  sac. 
  c/j. 
  Sac 
  

   with 
  copulatory 
  chsetse. 
  cp. 
  ch. 
  Copulatory 
  chsetse. 
  d. 
  Dorsal 
  chailae. 
  

   e. 
  Epithelium 
  of 
  penial 
  sac, 
  etc. 
  ep. 
  Epidermis, 
  f. 
  Funnel 
  of 
  sperm-duct. 
  

   gl. 
  Spermiducal 
  glaud. 
  Ig. 
  Longitudinal 
  muscles 
  of 
  body- 
  wall. 
  Im. 
  Longi- 
  

   tudinal 
  muscles 
  of 
  other 
  organs. 
  »/. 
  Muscle. 
  «/. 
  Cut 
  ends 
  of 
  muscle-fibres. 
  

   m. 
  c. 
  Body 
  of 
  muscle-cell. 
  mp. 
  Muscles 
  of 
  penis, 
  mw. 
  Fan-shaped 
  muscle 
  

   passing 
  from 
  atrial 
  sac 
  to 
  body-wall. 
  n. 
  Neck 
  of 
  spermiducal 
  gland, 
  op. 
  

   Orifice 
  of 
  penis, 
  p. 
  Penis, 
  p. 
  s. 
  Penial 
  sac, 
  either 
  its 
  cavity 
  or 
  wall. 
  

  

  