﻿408 
  Mr. 
  H. 
  C. 
  Burnup 
  on 
  South- 
  African 
  

  

  the 
  denticle 
  between 
  the 
  inferior 
  parietal 
  and 
  the 
  columellar 
  

   plait, 
  is 
  very 
  variable 
  ; 
  it 
  is 
  sometimes 
  seen 
  on 
  the 
  parietal 
  

   wall, 
  sometimes 
  on 
  the 
  columella, 
  and 
  sometimes 
  in 
  the 
  

   angle 
  between. 
  

  

  Var. 
  minor, 
  Bens.? 
  (PI. 
  X. 
  figs. 
  5, 
  6.) 
  

  

  I 
  also 
  take 
  this 
  opportunity 
  of 
  offering 
  figures 
  of 
  two 
  shells 
  

   in 
  the 
  collection 
  of 
  Mr. 
  Ponsonby 
  given 
  to 
  him 
  by 
  Mr. 
  Ben- 
  

   son 
  as 
  representing 
  his 
  species 
  P. 
  stoaphora. 
  They 
  agree 
  

   in 
  all 
  essentials 
  with 
  P. 
  Icv/ardi, 
  Bens., 
  except 
  in 
  their 
  

   smaller 
  size 
  and 
  darker 
  colour 
  (the 
  larger 
  specimen 
  is 
  chestnut- 
  

   brown, 
  the 
  smaller 
  rather 
  paler). 
  

  

  The 
  following 
  are 
  the 
  dimensions: 
  — 
  

  

  Fig. 
  5. 
  Height 
  6-88, 
  width 
  3-07 
  mm. 
  

  

  Fig. 
  6. 
  „ 
  5;67, 
  „ 
  2-75 
  „ 
  

  

  The 
  figures 
  are 
  given 
  as 
  a 
  contribution 
  towards 
  answers 
  to 
  

   Melvill 
  and 
  Ponsonby's 
  questions, 
  " 
  What 
  is 
  P. 
  stoaphora, 
  

   Bens.?" 
  and 
  " 
  Can 
  this 
  be 
  a 
  synonym 
  of 
  the 
  var. 
  minor?" 
  

   Since 
  the 
  shells 
  given 
  out 
  by 
  the 
  author 
  as 
  P. 
  stoaphora, 
  

   Bens., 
  seem 
  to 
  agree 
  so 
  closely 
  with 
  the 
  description 
  of 
  his 
  

   P. 
  layardi, 
  var. 
  minor, 
  and 
  since 
  neither 
  Messrs. 
  Melvill 
  

   and 
  Ponsonby 
  nor 
  Dr. 
  Sturany 
  can 
  trace 
  the 
  debatable 
  

   species, 
  it 
  seems 
  reasonable 
  to 
  infer 
  that 
  Benson 
  changed 
  its 
  

   name 
  to 
  var. 
  minor 
  before 
  publication 
  of 
  his 
  differentiation. 
  

  

  13. 
  Pupa 
  noltei, 
  Bttg. 
  

   Bcettger 
  * 
  places 
  this 
  species 
  in 
  Leucochiloides 
  (Microstele). 
  

  

  14. 
  Pupa 
  perplexa, 
  Burnup. 
  

  

  Excepting 
  that 
  the 
  word 
  labrum 
  is 
  printed 
  " 
  labium,"" 
  the 
  

   description 
  in 
  the 
  Survey 
  appears 
  as 
  it 
  was 
  written. 
  As, 
  

   however, 
  it 
  contains 
  certain 
  ambiguous 
  expressions, 
  I 
  emend 
  

   it 
  as 
  follows 
  : 
  — 
  

  

  Shell 
  very 
  small, 
  umbilicate, 
  cylindrical, 
  thin, 
  translucent, 
  

   shining, 
  pale 
  brown 
  ; 
  spire 
  cylindrical, 
  rounded 
  above, 
  sutures 
  

   impressed, 
  apex 
  obtuse 
  ; 
  whorls 
  6, 
  very 
  convex, 
  closely 
  trans- 
  

   versely 
  Urate, 
  except 
  the 
  first 
  two 
  which 
  are 
  smooth, 
  the 
  

   shell 
  at 
  the 
  fourth, 
  fifth, 
  and 
  sixth 
  whorls 
  of 
  nearly 
  equal 
  

   width, 
  the 
  last 
  half-whorl 
  acquiring 
  its 
  greatest 
  expansion 
  

   a 
  little 
  below 
  the 
  suture 
  and 
  then 
  being 
  flattened 
  beneath, 
  

   forming 
  an 
  infrasutural 
  angle, 
  the 
  last 
  whorl 
  compressed 
  

   towards 
  the 
  umbilicus; 
  aperture 
  rounded, 
  nearly 
  ^ 
  the 
  

   height 
  of 
  the 
  shell; 
  peristome 
  whitish, 
  reflexed, 
  especially 
  

  

  * 
  Abhandl. 
  d. 
  Senckcnb. 
  naturf. 
  Gesell. 
  Bd. 
  xxxii. 
  (1910) 
  p. 
  445. 
  

  

  