﻿52 
  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  The 
  collection 
  included 
  four 
  specimens 
  of 
  this 
  very 
  pretty 
  little 
  

   species. 
  

  

  EjfNEA 
  EiNGicuLA, 
  Morelet.^ 
  

  

  Two 
  examples 
  were 
  collected, 
  which, 
  though 
  considerably 
  smaller 
  

   than 
  the 
  type-specimen 
  in 
  the 
  British 
  Museum, 
  after 
  careful 
  examina- 
  

   tion 
  I 
  am 
  able 
  to 
  refer 
  to 
  this 
  species 
  ; 
  they 
  have 
  both 
  been 
  acquired 
  for 
  

   the 
  national 
  collection. 
  

  

  Ennea 
  Eosenbekgiana, 
  n.sp. 
  

  

  Shell 
  ovate, 
  solid, 
  rimate, 
  pale 
  brownish-yellow 
  ; 
  spire 
  very 
  obtuse 
  ; 
  

   whorls 
  8, 
  flat, 
  the 
  first 
  2^ 
  smooth, 
  the 
  later 
  whorls 
  sculptured 
  with 
  

   somewhat 
  fine, 
  oblique, 
  closely 
  set, 
  transverse 
  riblets, 
  the 
  last 
  whorl 
  

   ascending 
  in 
  front, 
  strangulate 
  towards 
  the 
  base 
  ; 
  sutures 
  incised, 
  

   slightly 
  crenellated 
  by 
  the 
  apices 
  of 
  the 
  transverse 
  riblets 
  ; 
  umbilicus 
  

   reduced 
  to 
  an 
  elongate 
  narrow 
  chink 
  ; 
  columella 
  slightly 
  oblique, 
  

   bearing 
  a 
  strong 
  sickle-shaped 
  fold 
  or 
  plait, 
  within 
  the 
  curve 
  of 
  which 
  

   appears 
  a 
  small 
  denticle 
  ; 
  labrum 
  white, 
  polished, 
  expanded, 
  and 
  

   reflexed, 
  except 
  near 
  the 
  point 
  of 
  insertion 
  with 
  the 
  whorl 
  above, 
  the 
  

  

  margins 
  connected 
  by 
  a 
  broad, 
  shining, 
  parietal 
  callus 
  ; 
  parietal 
  wall 
  

   bearing 
  a 
  single, 
  very 
  elongate, 
  wavily 
  curved 
  lamella, 
  somewhat 
  

   erect 
  behind, 
  then 
  sloping 
  away, 
  and 
  finally 
  becoming 
  very 
  erect 
  in 
  

   front 
  ; 
  outer 
  wall 
  bearing, 
  as 
  a 
  result 
  of 
  strangulation, 
  two 
  or 
  three 
  

   revolving 
  lamellae, 
  the 
  first 
  or 
  upper 
  one 
  being 
  sometimes 
  obsolete 
  or 
  

   totally 
  absent 
  ; 
  aperture 
  irregularly 
  quadrate, 
  the 
  right 
  and 
  left 
  sides 
  

   sloping 
  towards 
  one 
  another. 
  Alt. 
  10*5, 
  diam. 
  maj. 
  5'25 
  mm. 
  ; 
  

   aperture, 
  alt. 
  3, 
  diam. 
  2-25 
  mm. 
  

  

  Hah. 
  — 
  Two 
  hundred 
  miles 
  due 
  east 
  of 
  Loanda, 
  Angola. 
  

  

  A 
  good 
  series 
  of 
  specimens 
  were 
  collected, 
  which, 
  with 
  the 
  exception 
  

   of 
  the 
  occasional 
  total 
  or 
  partial 
  absence 
  of 
  the 
  first 
  lamella 
  on 
  the 
  

   outer 
  wall, 
  show 
  practically 
  no 
  other 
  variation 
  ; 
  among 
  these 
  were 
  

   a 
  number 
  of 
  scarcely 
  half-grown 
  individuals 
  in 
  which 
  the 
  umbilicus 
  is 
  

   circular, 
  deep, 
  and 
  moderately 
  wide. 
  

  

  Two 
  immature 
  specimens 
  of 
  what 
  would 
  appear 
  to 
  be 
  another 
  form 
  

   of 
  Ennea 
  also 
  occurred, 
  but 
  as 
  they 
  are 
  both 
  obviously 
  only 
  half-grown 
  

   it 
  would 
  be 
  quite 
  useless 
  to 
  give 
  any 
  detailed 
  description 
  of 
  them. 
  

  

  Voyage 
  du 
  Dr. 
  F. 
  Welwitsch 
  dans 
  les 
  Eoyaumes 
  d' 
  Angola 
  et 
  de 
  Benguella," 
  

   1868, 
  pp. 
  80-1. 
  

  

  