﻿166 
  

  

  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGIClt 
  SOCIETY. 
  

  

  deeply 
  impressed 
  ; 
  perforation 
  very 
  narrow, 
  almost, 
  concealed 
  by 
  the 
  

   reflexion 
  of 
  the 
  columella 
  ; 
  columella 
  reflexed, 
  diaphanous 
  ; 
  labrum 
  

   simple; 
  aperture 
  ovate. 
  Alt. 
  10, 
  diam. 
  maj. 
  5, 
  min. 
  4"o 
  mm. 
  ; 
  

   aperture, 
  alt. 
  3*5, 
  diam. 
  2 
  mm. 
  

  

  4 
  

  

  Very 
  closely 
  allied 
  to 
  B. 
  emimdus, 
  Mor., 
  but 
  differing 
  from 
  that 
  

   species 
  in 
  having 
  broader 
  and 
  less 
  convex 
  whorls 
  ; 
  moreover, 
  in 
  the, 
  

   present 
  species 
  there 
  is 
  one 
  whorl 
  less 
  than 
  in 
  B. 
  eminulm. 
  

  

  Cerastus 
  Olivieei, 
  Pfr. 
  

  

  A 
  number 
  of 
  specimens 
  in 
  every 
  stage 
  of 
  growth 
  and 
  showing 
  great 
  

   variation, 
  the 
  dimensions 
  of 
  the 
  smallest 
  and 
  largest 
  adults 
  being 
  as 
  

   follows 
  (measurements 
  in 
  millimetres) 
  : 
  — 
  

  

  Cekastus 
  Neumanni, 
  Kob.^ 
  

  

  A 
  few 
  examples 
  which 
  I 
  am 
  unable 
  to 
  separate 
  from 
  the 
  specimei 
  

   of 
  this 
  species 
  in 
  the 
  British 
  Museum, 
  and 
  which 
  was 
  originally 
  

   described 
  from 
  the 
  neighbourhood 
  of 
  Harar. 
  

  

  Cerastus 
  sinuosus, 
  Bgt.* 
  

  

  Also 
  a 
  few 
  specimens, 
  smaller, 
  shorter, 
  and 
  rather 
  more 
  globose 
  

   than 
  the 
  last, 
  and 
  which, 
  judging 
  from 
  the 
  figures 
  and 
  dimensions 
  

   which 
  I 
  have 
  seen 
  of 
  this 
  species, 
  I 
  am 
  able 
  to 
  refer 
  to 
  it. 
  

  

  Clausilia 
  Sennaariensis, 
  Pfr. 
  

  

  A 
  number 
  of 
  specimens 
  which 
  show 
  some 
  variation 
  in 
  length, 
  \ 
  

   though 
  the 
  sculpture 
  is 
  in 
  all 
  cases 
  very 
  constant 
  ; 
  the 
  largest 
  is 
  J; 
  

   13 
  mm. 
  long, 
  whereas 
  the 
  smallest 
  is 
  but 
  10-75. 
  : 
  

  

  Achatina 
  Ariel, 
  n.sp. 
  | 
  

  

  Shell 
  small, 
  subulately 
  fusiform, 
  thin, 
  transparent, 
  pale 
  yellow; 
  i 
  

   whorls 
  8, 
  sculptured, 
  especially 
  above, 
  with 
  fine, 
  irregular, 
  transverse 
  I 
  

   riblets 
  ; 
  sutures 
  impressed, 
  somewhat 
  crenellate, 
  very 
  narrowly 
  ' 
  

  

  ' 
  Martini-Chemnitz, 
  Syst. 
  Conch. 
  Cab., 
  Die 
  Bulimidse, 
  Theil 
  ii, 
  p. 
  745, 
  sp. 
  417, 
  

  

  pi. 
  ex, 
  fig's. 
  1, 
  2. 
  

   ''■ 
  " 
  Histoire 
  Malacologique 
  de 
  I'Abyssinie 
  " 
  : 
  Annales 
  des 
  Sciences 
  Naturelles, 
  Zool., 
  

  

  t. 
  XV, 
  p. 
  4 
  9, 
  fig. 
  63, 
  1883. 
  

  

  1 
  

  

  