﻿54 
  ON 
  THE 
  NAIADES, 
  

  

  thickness 
  and 
  reflection 
  of 
  the 
  lip. 
  The 
  last 
  whorl 
  is 
  very 
  round 
  — 
  

   the 
  umbilicus 
  large 
  and 
  partly 
  covered. 
  

  

  Helix 
  mamilla. 
  Plate 
  XIX. 
  fig. 
  64. 
  

  

  Testa 
  solidd, 
  elevata, 
  obtuso-conicd, 
  inferne 
  rotundatd, 
  imperforald, 
  colore 
  colura- 
  

   bino 
  tincta, 
  longitudinaliter 
  nilide 
  striata, 
  fasciis 
  duabus 
  obsoletis 
  indutd, 
  apice 
  

   subrufo 
  ; 
  anfractibus 
  quints, 
  rotundatis 
  ; 
  spird 
  exsertd 
  ; 
  aperturd 
  subrvfd, 
  ovatd 
  ; 
  

   labro 
  subreflcxo, 
  crasso, 
  prope 
  basin 
  majori 
  ; 
  columella 
  lasvi, 
  ad 
  basin 
  subconcavd. 
  

  

  Shell 
  solid, 
  elevated, 
  obtusely 
  conical, 
  rounded 
  below, 
  imperforate, 
  dove 
  coloured, 
  

   transversely 
  and 
  finely 
  striate, 
  with 
  two 
  obsolete 
  bands, 
  pink 
  at 
  the 
  apex 
  ; 
  whorls 
  five 
  

   and 
  rounded 
  ; 
  spire 
  elevated 
  ; 
  aperture 
  pink, 
  oval 
  ; 
  outer 
  lip 
  somewhat 
  reflected, 
  thick, 
  

   enlarged 
  towards 
  the 
  base; 
  columella 
  smooth, 
  at 
  the 
  base 
  impressed. 
  

  

  Hab 
  

  

  My 
  Cabinet. 
  

   Diam. 
  -8, 
  Length 
  -7 
  of 
  an 
  inch. 
  

  

  Remarks.— 
  I 
  have 
  rarely 
  met 
  with 
  a 
  more 
  beautiful 
  and 
  interesting 
  

   species 
  of 
  the 
  genus 
  than 
  the 
  above. 
  It 
  is 
  eminently 
  distinguished 
  by 
  

   its 
  solidity, 
  its 
  thick, 
  smooth 
  and 
  beautifully 
  coloured 
  lip, 
  its 
  fine 
  deli- 
  

   cate 
  colour, 
  and 
  its 
  elevated 
  and 
  red 
  tipped 
  spire. 
  The 
  columella 
  is 
  

   somewhat 
  thickened 
  and 
  deeply 
  impressed 
  at 
  the 
  base. 
  

  

  It 
  is 
  to 
  be 
  regretted 
  that 
  the 
  habitat 
  of 
  this 
  species 
  is 
  not 
  known. 
  

   It 
  was 
  met 
  with 
  accidentally 
  at 
  a 
  dealer's. 
  

  

  Helix 
  diaphana. 
  Plate 
  XIX. 
  fig. 
  65. 
  

  

  Testa 
  lata, 
  superne 
  depressd, 
  inferne 
  inflatd, 
  longitudinaliter 
  et 
  nilide 
  striata 
  ; 
  

   subluted, 
  obscure 
  bifasciatd 
  super 
  medium 
  anfractum, 
  vmbilicatd; 
  anfractibus 
  

   quaternis 
  ; 
  spird 
  planulaid 
  ; 
  aperturd 
  magna 
  et 
  subrotundd 
  ; 
  labro 
  simplici 
  ; 
  colum- 
  

   ella 
  brevissimd 
  laevique. 
  

  

  Shell 
  wide, 
  depressed 
  above, 
  inflated 
  below, 
  longitudinally 
  and 
  finely 
  striate, 
  pale 
  

   yellow, 
  obscurely 
  banded 
  above 
  the 
  centre 
  of 
  the 
  whorl, 
  umbilicated; 
  whorls 
  four: 
  

  

  