﻿51 
  

  

  jS'otes 
  on 
  a 
  small 
  collection 
  op 
  teerestrial 
  shells 
  

   from 
  angola, 
  with 
  descriptions 
  of 
  ne^y 
  species. 
  

  

  By 
  H. 
  B. 
  PiiEsTON, 
  F.Z.S. 
  

  

  Read 
  IQth 
  December, 
  1909. 
  

  

  The 
  material 
  on 
  which 
  the 
  following 
  notes 
  are 
  based 
  was 
  collected 
  by 
  

   Dr. 
  W. 
  G. 
  Ansorge 
  at 
  a 
  point 
  about 
  two 
  hundred 
  miles 
  due 
  east 
  of 
  

   Loanda, 
  in 
  Angola. 
  Considering 
  the 
  enormous 
  area 
  of 
  this 
  Portuguese 
  

   dependency, 
  comprising 
  as 
  it 
  does 
  some 
  200,000 
  square 
  miles 
  of 
  more 
  

   or 
  less 
  unexplored 
  territory, 
  it 
  is 
  surprising 
  what 
  a 
  very 
  little 
  is 
  at 
  

   present 
  known 
  of 
  its 
  terrestrial 
  mollusca, 
  as, 
  with 
  the 
  exceptions 
  

   of 
  Morelet's 
  work 
  ^ 
  and 
  a 
  few 
  scattered 
  papers 
  chiefly 
  concerning 
  non- 
  

   testaceous 
  molluscs, 
  scarcely 
  any 
  work 
  has 
  hitherto 
  been 
  done 
  with 
  

   regard 
  to 
  this 
  branch 
  of 
  its 
  faana. 
  Unfortunately 
  the 
  present 
  collection, 
  

   doubtless 
  owing 
  to 
  the 
  limited 
  time 
  at 
  the 
  disposal 
  of 
  the 
  collector, 
  

   is 
  very 
  small 
  ; 
  but, 
  though 
  it 
  only 
  includes 
  in 
  all 
  about 
  a 
  dozen 
  species, 
  

   six 
  of 
  these 
  appear 
  to 
  be 
  new 
  to 
  science. 
  

  

  A 
  part 
  of 
  the 
  collection 
  in 
  question 
  has 
  been 
  acquired 
  by 
  the 
  British 
  

   Museum 
  and 
  the 
  remainder 
  by 
  myself, 
  and 
  I 
  am 
  much 
  indebted 
  to 
  

   Mr. 
  Edgar 
  A. 
  Smith 
  for 
  kindly 
  placing 
  in 
  my 
  hands 
  for 
  identification 
  

   that 
  portion 
  secured 
  bj- 
  his 
  department, 
  and 
  also 
  for 
  much 
  valuable 
  

   help 
  in 
  working 
  out 
  the 
  material. 
  

  

  Ennea 
  Ansorgei, 
  n.sp. 
  

  

  Shell 
  cylindrically 
  ovate, 
  somewhat 
  thin, 
  glossy, 
  yellowish 
  white 
  ; 
  

   spire 
  moderately 
  obtuse 
  at 
  the 
  apex; 
  whorls 
  7, 
  convex, 
  sculptured, 
  

   with 
  oblique, 
  slightly 
  arcuate, 
  closely 
  set, 
  transverse 
  costulse, 
  the 
  last 
  

   whorl 
  strangulate 
  ; 
  sutures 
  impressed 
  ; 
  perforation 
  scarcely 
  apparent 
  ; 
  

   columella 
  broad, 
  oblique 
  ; 
  labrum 
  white, 
  polished, 
  expanded, 
  bulging 
  

   inwards 
  on 
  the 
  right 
  side, 
  the 
  margins 
  connected 
  by 
  a 
  broad, 
  thin, 
  

  

  I 
  

  

  scarcely 
  perceptible, 
  glossy 
  callus, 
  through 
  which 
  the 
  transverse 
  

   sculpture 
  is 
  easily 
  visible 
  ; 
  the 
  parietal 
  wall 
  bearing 
  on 
  the 
  right 
  side 
  

   a 
  strong, 
  erect, 
  white, 
  vertical 
  lamella 
  ; 
  the 
  outer 
  wall 
  bearing, 
  as 
  the 
  

   result 
  of 
  strangulation, 
  two 
  strong, 
  white 
  lamellae 
  ; 
  aperture 
  obliquely 
  

   subquadrate. 
  

  

  Alt. 
  5-25, 
  diam. 
  maj. 
  2-75 
  ram. 
  ; 
  aperture, 
  alt. 
  1, 
  diam. 
  1 
  mm. 
  

  

  Sah. 
  — 
  Two 
  hundred 
  miles 
  due 
  east 
  of 
  Loanda, 
  Angola. 
  Type 
  in 
  

   British 
  Museum. 
  

  

  1 
  "Voyage 
  du 
  Dr. 
  Friedrich 
  Welwitsch 
  dans 
  les 
  Royaumes 
  d' 
  Angola 
  et 
  de 
  

   Benguella," 
  MoUusques, 
  1868. 
  

  

  