﻿54 
  Descriptions 
  of 
  New 
  Species 
  and 
  Varieties 
  of 
  Shells, 
  

  

  For 
  this 
  species 
  I 
  am 
  indebted 
  to 
  Mr. 
  Cliitty. 
  It 
  was 
  

   found 
  at 
  Easington, 
  in 
  the> 
  parish 
  of 
  St. 
  David's. 
  

  

  Mean 
  divergence 
  about 
  45° 
  ; 
  length 
  .96 
  inch 
  after 
  trunca- 
  

   tion 
  ; 
  greatest 
  breadth 
  .63 
  inch 
  ; 
  least 
  breadth 
  .55 
  inch. 
  

  

  Cyclostoma 
  lamellosum. 
  Shell 
  ovate 
  conic, 
  rather 
  short 
  : 
  

   with 
  several 
  inequidistant 
  unequal 
  more 
  or 
  less 
  interrupted 
  

   spiral 
  lines 
  of 
  brown, 
  of 
  which 
  four 
  or 
  five 
  appear 
  on 
  the 
  pe- 
  

   nult 
  whorl 
  : 
  with 
  rather 
  closely 
  set 
  sharp 
  elevated 
  transverse 
  

   lamella3, 
  which 
  are 
  more 
  prominent 
  at 
  the 
  sutures 
  ; 
  without 
  

   spiral 
  striEB, 
  except 
  a 
  few 
  ridges 
  in 
  the 
  umbilicus 
  : 
  apex 
  trun- 
  

   cate 
  with 
  the 
  loss 
  of 
  two 
  or 
  three 
  whorls 
  : 
  spire 
  with 
  the 
  out- 
  

   lines 
  quite 
  convex 
  : 
  about 
  three 
  and 
  one-half 
  whorls 
  remain- 
  

   ing, 
  very 
  convex, 
  with 
  a 
  rather 
  deep 
  suture 
  : 
  aperture 
  orbicu- 
  

   lar, 
  with 
  two 
  peritremes, 
  of 
  which 
  the 
  outer 
  one 
  is 
  narrow, 
  

   auriculate 
  above, 
  reflected 
  nearly 
  into 
  the 
  plane 
  of 
  the 
  aper- 
  

   ture 
  ; 
  the 
  inner 
  peritreme 
  is 
  rather 
  stout, 
  well 
  produced, 
  a 
  

   little 
  reflected. 
  The 
  operculum 
  has 
  a 
  spiral 
  lamella, 
  which 
  

   has 
  about 
  four 
  and 
  one-half 
  whorls, 
  and 
  is 
  but 
  little 
  elevated 
  

   and 
  much 
  produced 
  laterally. 
  

  

  Mean 
  divergence 
  about 
  50° 
  ; 
  length 
  after 
  truncation 
  .49 
  

   inch 
  ; 
  greatest 
  breadth 
  .4 
  inch 
  ; 
  least 
  breadth 
  .34 
  inch. 
  

  

  This 
  shell 
  much 
  resembles 
  C. 
  tectilabre, 
  but 
  the 
  outer 
  per- 
  

   itreme 
  is 
  more 
  expanded, 
  and 
  the 
  margin 
  of 
  the 
  operculum 
  is 
  

   not 
  reflected 
  backwards. 
  

  

  Cyclostoma 
  simulans. 
  Shell 
  long 
  ovate 
  conic 
  : 
  very 
  pale 
  

   brown 
  or 
  dingy 
  white, 
  with 
  numerous 
  spiral 
  series 
  of 
  small 
  

   dark 
  brown 
  spots, 
  which 
  are 
  often 
  elongate, 
  and 
  which 
  are 
  

   arranged 
  in 
  inequidistant 
  transverse 
  stripes 
  : 
  with 
  closely 
  set 
  

   rather 
  strong 
  transverse 
  raised 
  lines 
  and 
  indistinct 
  spiral 
  striae, 
  

   moderately 
  crenulate 
  along 
  the 
  suture 
  : 
  apex 
  truncate 
  with 
  

   the 
  loss 
  of 
  — 
  whorls 
  : 
  si)ire 
  with 
  the 
  outlines 
  moderately 
  cur- 
  

   vilinear 
  : 
  whorls 
  remaining 
  after 
  truncation 
  four 
  or 
  five, 
  quite 
  

  

  