﻿•11- 
  Mr, 
  11. 
  C 
  Burnup 
  on 
  South-African 
  

  

  Var. 
  darglensis, 
  new 
  var. 
  

  

  Melv. 
  & 
  Pons. 
  Ann. 
  & 
  Mag. 
  Nat. 
  Hist. 
  BGT. 
  8, 
  vol. 
  i. 
  (1908) 
  pi. 
  ii, 
  

   6g. 
  88 
  [as 
  ftfw 
  (JRmndu*) 
  ytoimtfaoiMi 
  (Anc.)]. 
  

  

  Shell 
  small, 
  conic-oval, 
  rimate 
  and 
  very 
  narrowly 
  perforate, 
  

   thin, 
  shining, 
  greyish 
  horn-coloured, 
  translucent, 
  sinistral. 
  

   Spireovately 
  conic; 
  apex 
  obtuse 
  and 
  mammillated. 
  Whorls 
  

   slightly 
  convex, 
  gradually 
  increasing, 
  with 
  suture 
  distinct 
  

   but 
  not 
  deep, 
  obliquely 
  sculptured 
  with 
  close, 
  sharply-outj 
  

   arched 
  oblique 
  striae, 
  except 
  the 
  first 
  H 
  which 
  are 
  smooth, 
  the 
  

   last 
  more 
  convex, 
  rounded 
  below, 
  much 
  constricted 
  towards 
  

   the 
  peristome 
  and 
  impressed 
  towards 
  the 
  rima 
  and 
  small 
  

   perforation, 
  the 
  long 
  inrunning 
  peristomatal 
  processes 
  ami 
  

   spaces 
  between 
  being 
  represented 
  on 
  the 
  outside 
  by 
  alternate 
  

   grooves 
  and 
  ridges. 
  Aperture 
  upright, 
  irregularly 
  ovate, 
  

   nearly 
  closed 
  with 
  the 
  following 
  inrunning 
  white 
  plaits: 
  — 
  

   parietal 
  2, 
  the 
  first 
  arising 
  as 
  a 
  narrow 
  thread 
  high 
  on 
  the 
  

   body-whorl, 
  becoming 
  broader 
  and 
  contorted 
  as 
  it 
  descends, 
  

   always 
  receding 
  inwards, 
  to 
  below 
  the 
  centre 
  of 
  the 
  aperture, 
  

   whence 
  it 
  is 
  bent 
  sharply 
  back, 
  embracing 
  the 
  parietal 
  wall, 
  

   till 
  it 
  is 
  lost 
  sight 
  of 
  in 
  the 
  interior 
  of 
  the 
  shell 
  ; 
  the 
  second, 
  

   also 
  arising 
  high 
  on 
  the 
  body-whorl, 
  is 
  expanded 
  on 
  the 
  left 
  

   till 
  it 
  meets 
  the 
  peristome, 
  with 
  which 
  it 
  combines 
  till 
  the 
  

   lobe 
  of 
  the 
  labium 
  is 
  reached, 
  whence 
  it 
  doubles 
  back 
  in 
  two 
  

   foliaceous 
  folds 
  and 
  descends 
  as 
  a 
  simple 
  plait, 
  receding 
  in- 
  

   wards 
  and 
  following 
  a 
  line 
  parallel 
  with 
  the 
  first 
  till 
  it 
  too 
  

   is 
  lost 
  sight 
  of 
  in 
  the 
  interior 
  oi 
  the 
  shell 
  ; 
  labial 
  o, 
  oi 
  which 
  

   the 
  upper 
  two 
  are 
  small, 
  though 
  deeply 
  penetrating 
  the 
  aper- 
  

   ture, 
  and 
  rather 
  close 
  together 
  ; 
  the 
  third, 
  though 
  equally 
  

   narrow, 
  is 
  very 
  long 
  and 
  sinuous 
  and 
  as, 
  in 
  its 
  progress 
  

   towards 
  the 
  interior, 
  it 
  embraces 
  the 
  expanded 
  outer 
  lip, 
  it 
  

   is 
  lost 
  to 
  sight 
  till 
  the 
  far 
  end 
  reappears 
  in 
  the 
  gullet 
  ; 
  

   columellar 
  3, 
  of 
  which 
  the 
  upper 
  two 
  arise, 
  thread-like, 
  on 
  

   the 
  edge 
  of 
  the 
  labium, 
  becoming 
  stouter 
  as 
  they 
  curve 
  

   inwards, 
  the 
  upper 
  one 
  entering 
  at 
  the 
  junction 
  o( 
  the 
  parietal 
  

   wall 
  with 
  the 
  columella, 
  and 
  the 
  lower 
  about 
  the 
  middle 
  o( 
  

   the 
  columella, 
  after 
  taking 
  a 
  wide 
  sweep 
  towards 
  the 
  centre 
  

   oi 
  the 
  aperture 
  : 
  the 
  lowest 
  columellar 
  plait 
  is 
  smaller, 
  but 
  

   long 
  and 
  penetrating 
  : 
  lastly, 
  there 
  are 
  two 
  plaits 
  on 
  the 
  base 
  

   o( 
  the 
  peristome 
  similar 
  to 
  the 
  lowest 
  columellar 
  plait. 
  

   Peristome 
  widely 
  expanded, 
  but 
  little 
  thickened 
  except 
  by 
  the 
  

   plaits 
  which 
  arise 
  close 
  to 
  the 
  margin, 
  paler 
  than 
  the 
  rest 
  

   of 
  the 
  shell, 
  becoming 
  white 
  at 
  the 
  edges, 
  where 
  its 
  outline 
  

   is 
  slightly 
  peaked 
  at 
  The 
  sources 
  ot 
  the 
  plaits 
  ; 
  the 
  ends 
  con- 
  

   ge 
  and 
  are 
  connected 
  by 
  a 
  stout 
  glossy 
  callus 
  reaching 
  

  

  