﻿62 
  Analysis 
  of 
  a 
  certam 
  Group 
  of 
  Species 
  of 
  Cyclostoma. 
  

  

  Mean 
  divergence 
  about 
  135° 
  ; 
  height 
  .57 
  inch 
  ; 
  greatest 
  breadth 
  .99 
  inch 
  ; 
  

   least 
  breadth 
  .76 
  inch. 
  

  

  No. 
  13. 
  Brownish 
  red 
  in 
  the 
  upper 
  whorls, 
  white 
  in 
  the 
  last 
  whorl 
  ; 
  with 
  a 
  

   brown 
  epidermis 
  : 
  with 
  the 
  transverse 
  striiE 
  quite 
  fine 
  ; 
  foveate' 
  wrinkles 
  commenc- 
  

   ing 
  in 
  the 
  latter 
  part 
  of 
  the 
  penult 
  whorl, 
  and 
  becoming 
  obsolete 
  in 
  the 
  latter 
  part 
  

   of 
  the 
  last 
  whorl 
  ; 
  with 
  some 
  lightly 
  impressed 
  spiral 
  stria; 
  on 
  the 
  last 
  wliorl 
  : 
  um- 
  

   bilical 
  keel 
  moderately 
  developed 
  ; 
  spire 
  moderately 
  elevated: 
  whorls 
  nearly 
  five 
  ; 
  

   penult 
  whorl 
  flattened 
  and 
  last 
  whorl 
  much 
  depressed 
  above 
  ; 
  with 
  a 
  well 
  impressed 
  

   suture 
  : 
  aperture 
  orbicular, 
  advanced 
  above 
  in 
  an 
  acute 
  effuse 
  point 
  ; 
  lip 
  sinuate 
  

   above, 
  moderately 
  thickened 
  : 
  umbiHcus 
  about 
  two-thirds 
  as 
  wide 
  as 
  the 
  aperture. 
  

   Operculum 
  unknown. 
  

  

  Mean 
  divergence 
  about 
  130° 
  ; 
  height 
  .7 
  inch 
  ; 
  greatest 
  breadth 
  1.15 
  inch 
  ; 
  

   least 
  breadth 
  .93 
  inch. 
  

  

  No. 
  14. 
  White, 
  often 
  more 
  or 
  less 
  reddish 
  ; 
  epidermis 
  dark 
  brown, 
  sometimes 
  

   paler 
  and 
  greenish 
  ; 
  with 
  a 
  band 
  on 
  the 
  periphery, 
  and 
  a 
  very 
  narrow 
  one 
  at 
  the 
  

   upper 
  edge 
  of 
  the 
  last 
  whorl 
  : 
  with 
  a 
  few 
  indistinct 
  wrinkles 
  on 
  the 
  last 
  whorl 
  near 
  

   the 
  suture 
  ; 
  transverse 
  striae 
  very 
  fine 
  ; 
  umbilical 
  keel 
  well 
  developed 
  with 
  age 
  : 
  

   Bpire 
  well 
  elevated 
  : 
  whorls 
  nearly 
  five, 
  very 
  convex 
  ; 
  last 
  whorl 
  with 
  a 
  slight 
  de- 
  

   pression 
  above 
  ; 
  suture 
  well 
  impressed 
  : 
  aperture 
  suborbicular, 
  quite 
  effuse 
  and 
  

   acute 
  above 
  ; 
  lip 
  well 
  thickened, 
  a 
  little 
  sinuate 
  above, 
  moderately 
  advanced 
  on 
  

   the 
  right 
  side 
  : 
  umbilicus 
  about 
  two-thirds 
  as 
  wide 
  as 
  the 
  aperture. 
  Operculum 
  

   with 
  a 
  spiral 
  lamella 
  of 
  about 
  five 
  whorls, 
  of 
  which 
  the 
  inner 
  whorls 
  are 
  a 
  little 
  

   inclined 
  inwards, 
  and 
  the 
  outer 
  ones 
  shelve 
  inwards 
  and 
  are 
  much 
  thickened. 
  

  

  It 
  inhabits 
  Accompongtown, 
  in 
  the 
  interior, 
  in 
  St. 
  Elizabeth's 
  parish. 
  

  

  Mean 
  divergence 
  about 
  120° 
  ; 
  height 
  .5 
  inch 
  ; 
  greatest 
  breadth 
  .73 
  inch 
  ; 
  least 
  

   breadth 
  .58 
  inch. 
  

  

  No. 
  14' 
  has 
  a 
  bright 
  red 
  spire, 
  and 
  on 
  the 
  last 
  two 
  whorls 
  numerous 
  minute 
  

   wrinkles, 
  which 
  are 
  indistinct 
  about 
  the 
  periphery 
  of 
  the 
  last 
  whorl 
  ; 
  without 
  the 
  

   white 
  bands. 
  Operculum 
  unknown. 
  

  

  No. 
  14" 
  is 
  intermediate 
  between 
  14 
  and 
  14.' 
  

  

  No. 
  15. 
  Shell 
  brownish 
  orange 
  or 
  brownish 
  on 
  the 
  spire, 
  reddish 
  white 
  on 
  the 
  

   last 
  whorl 
  ; 
  with 
  a 
  brown 
  epidermis, 
  which 
  on 
  the 
  last 
  whorl 
  is 
  mostly 
  limited 
  to 
  

   two 
  or 
  three 
  dark 
  brown 
  broad 
  well 
  defined 
  spiral 
  bands, 
  which 
  are 
  often 
  confluent 
  

   in 
  one 
  : 
  with 
  the 
  transverse 
  striae 
  very 
  fine 
  ; 
  wrinkles 
  commencing 
  about 
  the 
  mid- 
  

   dle 
  of 
  the 
  penult 
  whorl, 
  mostly 
  foveate 
  ; 
  last 
  whorl 
  very 
  irregularly 
  wrinkled 
  

   above, 
  with 
  minute 
  pits 
  exterior 
  to 
  the 
  well 
  developed 
  umbilical 
  keel, 
  otherwise 
  

   smooth 
  : 
  spire 
  well 
  elevated 
  : 
  whorls 
  nearly 
  five, 
  with 
  a 
  slight 
  depression 
  at 
  the 
  

   top 
  of 
  the 
  last 
  whorl 
  ; 
  with 
  the 
  suture 
  well 
  impressed 
  : 
  aperture 
  suborbicular, 
  quite 
  

   effuse 
  and 
  pointed 
  above 
  ; 
  lip 
  thick, 
  a 
  little 
  sinuate 
  above, 
  and 
  well 
  advanced 
  on 
  

   the 
  right 
  side 
  : 
  umbilicus 
  about 
  three-fourths 
  as 
  wide 
  as 
  the 
  aperture. 
  Operculum 
  

   quite 
  concave, 
  with 
  the 
  spiral 
  lamella 
  scarcely 
  elevated, 
  but 
  much 
  thickened 
  and 
  

   appre&sed 
  on 
  the 
  exterior 
  side. 
  

   Inhabits 
  Manchester- 
  

   Mean 
  divergence 
  about 
  120° 
  ; 
  height 
  .65 
  inch 
  ; 
  greatest 
  breadth 
  1 
  inch 
  ; 
  least 
  

   breadth 
  .79 
  inch. 
  

  

  No. 
  15' 
  is 
  more 
  wrinkled 
  and 
  much 
  smaller, 
  its 
  greatest 
  breadth 
  being 
  .65 
  inch. 
  

  

  