﻿Species 
  and 
  Varieties 
  of 
  Pupa. 
  409 
  

  

  at 
  the 
  columella!* 
  margin, 
  thickened, 
  the 
  ends 
  converging 
  

   and 
  connected 
  by 
  a 
  thin 
  callus 
  ; 
  labrum 
  slightly 
  incurved 
  

   about 
  the 
  middle 
  ; 
  columella 
  straight. 
  The 
  processes 
  of 
  

   the 
  aperture 
  consist 
  of 
  a 
  small 
  white 
  parietal 
  plait 
  running 
  

   inwards 
  and 
  there 
  becoming 
  strong, 
  a 
  stout 
  white 
  post- 
  

   columellar 
  plait 
  also 
  running 
  inwards, 
  and 
  a 
  profoundly 
  post- 
  

   labral 
  tooth 
  or 
  plait 
  hidden 
  by 
  the 
  columella. 
  

  

  The 
  following 
  are 
  the 
  dimensions 
  of 
  the 
  shell 
  figured 
  in 
  

   the 
  Survey 
  : 
  — 
  

  

  Fig. 
  17. 
  Type: 
  height 
  1*72, 
  width 
  0*82 
  mm. 
  

   „ 
  18 
  (sectional). 
  „ 
  1*80, 
  „ 
  0*77 
  „ 
  

  

  Twenty-four 
  out 
  of 
  twenty-six 
  specimens 
  measured 
  by 
  me 
  

   show 
  very 
  little 
  variation 
  in 
  dimensions, 
  the 
  remaining 
  two, 
  

   both 
  apparently 
  mature, 
  being 
  somewhat 
  more 
  divergent, 
  

   viz. 
  : 
  — 
  

  

  Largest 
  : 
  height 
  1*88, 
  width 
  0*83 
  mm. 
  

  

  Smallest: 
  „ 
  1*50, 
  „ 
  0*77 
  „ 
  

  

  Bloemfontein 
  {Connolly) 
  may 
  now 
  be 
  added 
  to 
  the 
  localities 
  

   quoted 
  by 
  Melv. 
  & 
  Pons. 
  

  

  Judging 
  by 
  the 
  descriptions 
  and 
  figures 
  alone, 
  for 
  I 
  have 
  

   not 
  seen 
  Jickeli's 
  species, 
  this 
  shell 
  must 
  be 
  akin 
  to 
  his 
  

   P. 
  lardea, 
  schilleri, 
  and 
  similis 
  from 
  Upper 
  Nubia*, 
  whose 
  

   apertural 
  processes 
  seem 
  arranged 
  much 
  on 
  the 
  same 
  plan, 
  

   its 
  nearest 
  ally 
  being 
  the 
  last 
  named; 
  similis 
  is, 
  however, 
  

   about 
  one-fourth 
  wider 
  than 
  the 
  present 
  species 
  and 
  has 
  half 
  

   a 
  whorl 
  less, 
  while 
  the 
  peristome 
  is 
  less 
  expanded 
  and 
  the 
  

   labrum 
  less 
  bowed 
  inwards, 
  and 
  there 
  is 
  no 
  callus. 
  P. 
  lardea 
  

   and 
  schilleri 
  are 
  more 
  divergent, 
  being 
  not 
  so 
  high 
  as 
  similis 
  

   and 
  broader 
  in 
  proportion. 
  

  

  15. 
  Pupa 
  pretoriensis, 
  M. 
  & 
  P. 
  

  

  16. 
  Pupa 
  psichion, 
  M. 
  & 
  P. 
  

  

  I 
  have 
  not 
  seen 
  specimens 
  that 
  could 
  be 
  referred 
  to 
  either 
  

   of 
  the 
  above 
  two 
  species 
  in 
  the 
  very 
  large 
  series 
  of 
  shells 
  from 
  

   Pretoria 
  that 
  I 
  have 
  been 
  fortunate 
  enough 
  to 
  have 
  laid 
  at 
  

   my 
  disposal 
  for 
  examination, 
  though 
  the 
  number, 
  since 
  my 
  

   first 
  study 
  of 
  the 
  group, 
  has 
  been 
  greatly 
  augmented 
  by 
  the 
  

   collections 
  of 
  Major 
  Connolly. 
  

  

  17. 
  Pupa 
  quantula, 
  M. 
  & 
  P. 
  

  

  The 
  co-type 
  in 
  Mr. 
  Ponsonby's 
  collection, 
  figured 
  in 
  the 
  

  

  * 
  Jlck. 
  Faun. 
  L. 
  u. 
  Siissw. 
  Moll. 
  N.O.-Af. 
  (1874) 
  pp. 
  124, 
  125, 
  296, 
  

   pi. 
  v. 
  figs. 
  14-16. 
  

  

  Ann. 
  & 
  Mag. 
  N. 
  Hist. 
  Ser. 
  8. 
  Vol. 
  vii. 
  27 
  

  

  