﻿new 
  Shells 
  from 
  British 
  East 
  Africa. 
  -171 
  

  

  in 
  front, 
  having- 
  a 
  somewhat 
  weathered 
  appearance 
  ; 
  suture 
  

   well 
  impressed 
  ; 
  umbilicus 
  reduced 
  to 
  a 
  narrow 
  chink; 
  colu- 
  

   mella 
  descending 
  in 
  a 
  curve 
  ; 
  labrum 
  continuous, 
  white, 
  

   slightly 
  reflexed, 
  obtusely 
  angled 
  above 
  on 
  the 
  outer 
  side 
  ; 
  

   aperture 
  roundly 
  ovate, 
  armed 
  with 
  two 
  short, 
  erect, 
  parietal 
  

   lamellae 
  placed 
  the 
  one 
  almost 
  above 
  the 
  other, 
  the 
  lower 
  of 
  

   which 
  is 
  very 
  interiorly 
  situate, 
  a 
  tubercular 
  lamella 
  on 
  the 
  

   columella 
  and 
  a 
  sub-basal 
  lamella 
  on 
  the 
  outer 
  lip, 
  above 
  

   which, 
  and 
  well 
  inside 
  the 
  shell, 
  occurs 
  a 
  small 
  denticle. 
  

  

  Alt. 
  3*25, 
  diam. 
  niaj. 
  1*75 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  1, 
  diam. 
  '5 
  mm. 
  

  

  Bab. 
  Between 
  Rumruti 
  and 
  Mount 
  Kenia, 
  British 
  East 
  

   Africa. 
  

  

  Clausilia 
  degeneris, 
  sp. 
  n. 
  (Fig. 
  23.) 
  

  

  Shell 
  small, 
  thin, 
  cylindrically 
  subulate, 
  brown, 
  streaked 
  

   with 
  greyish 
  white; 
  whorls 
  7, 
  somewhat 
  convex, 
  sculptured 
  

   with 
  fine, 
  oblique, 
  closely 
  set, 
  silky, 
  transverse 
  stria3 
  ; 
  suture 
  

   well 
  impressed 
  ; 
  columella 
  whitish, 
  arched, 
  bearing 
  on 
  the 
  

   upper 
  portion 
  a 
  single 
  erect 
  lamella 
  almost 
  at 
  right 
  angles 
  ; 
  

   labrum 
  continuous, 
  whitish, 
  slightly 
  thickened, 
  scarcely 
  

   reflexed 
  ; 
  aperture 
  ovate. 
  

  

  Alt. 
  6"25, 
  diam. 
  maj. 
  1'5 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  1, 
  diam. 
  "5 
  mm. 
  

  

  Hah. 
  Between 
  Rummti 
  and 
  Mount 
  Kenia, 
  British 
  East 
  

   Africa. 
  

  

  A 
  small 
  degenerate 
  form 
  which 
  almost 
  marks 
  the 
  southern 
  

   limit 
  of 
  the 
  genus 
  on 
  the 
  African 
  continent. 
  

  

  Rebmanniella, 
  sec. 
  nov. 
  

  

  Shell 
  having 
  broad, 
  blunt, 
  apical 
  whorls 
  and 
  columella 
  

   almost 
  truncate. 
  

  

  Type 
  of 
  section, 
  R. 
  inepta. 
  

  

  Limicolaria 
  {Rebmanniella) 
  inepta, 
  sp. 
  n. 
  (Fig. 
  24.) 
  

  

  Shell 
  fusiform, 
  rather 
  solid, 
  the 
  earlier 
  whorls 
  painted 
  with 
  

   transverse 
  slate-coloured 
  flame-markings, 
  the 
  later 
  whorls 
  

   brownish 
  yellow, 
  stained, 
  streaked, 
  and 
  blotched 
  with 
  greyish 
  

   brown 
  ; 
  whorls 
  6j, 
  decussately 
  sculptured 
  throughout 
  with 
  

   spiral 
  strise 
  and 
  transverse 
  riblets 
  ; 
  suture 
  impressed, 
  slightly 
  

   crenellate, 
  margined 
  below 
  ; 
  columella 
  descending 
  nearly 
  

   vertically, 
  diffused 
  above 
  into 
  a 
  thin 
  polished 
  callus, 
  which 
  

   reaches 
  the 
  margin 
  of 
  the 
  labrum, 
  almost 
  truncate 
  below 
  ; 
  

   labium 
  simple, 
  acute, 
  somewhat 
  receding 
  above 
  and 
  below 
  ; 
  

  

  