﻿which 
  inhabit 
  Jamaica. 
  83 
  

  

  nm 
  in 
  a 
  rather 
  thin 
  curved 
  lamella, 
  extends 
  over 
  half 
  the 
  en- 
  

   trance 
  to 
  the 
  umbilical 
  arch. 
  

  

  Mean 
  divergence 
  165° 
  ; 
  height 
  .065 
  inch; 
  least 
  breadth 
  

   .095 
  inch 
  ; 
  greatest 
  breadth 
  .118 
  inch. 
  

  

  A 
  small 
  thick 
  variety 
  of 
  Trochatella 
  pnlchella 
  occurs 
  in 
  

   Portland, 
  with 
  the 
  spiral 
  ridges 
  remarkably 
  prominent. 
  It 
  

   may 
  be 
  designated 
  by 
  the 
  name 
  of 
  multicarinata. 
  Another 
  

   variety 
  occurs 
  at 
  the 
  opposite 
  extremity 
  of 
  the 
  island, 
  at 
  New- 
  

   Hope 
  in 
  Westmoreland, 
  which 
  is 
  very 
  large, 
  and 
  has 
  the 
  

   last 
  whorl 
  well 
  rounded 
  over 
  the 
  periphery, 
  without 
  any 
  keel 
  : 
  

   it 
  has 
  no 
  sculpture 
  except 
  the 
  impressed 
  spiral 
  lines 
  on 
  the 
  

   spire 
  and 
  on 
  the 
  upper 
  part 
  of 
  the 
  last 
  whorl. 
  The 
  lip 
  is 
  less 
  

   expanded 
  than 
  in 
  tiie 
  type 
  of 
  the 
  species. 
  It 
  may 
  be 
  desig- 
  

   nated 
  by 
  the 
  name 
  of 
  nobilis. 
  

  

  Of 
  Helicina 
  neritcUa, 
  a 
  variety, 
  angulata, 
  is 
  distinguished 
  

   by 
  an 
  angular 
  periphery, 
  and 
  by 
  a 
  double 
  and 
  much 
  thickened 
  

   lip. 
  

  

  G-eomelania 
  Hilliana. 
  Shell 
  conic-cylindric 
  : 
  white 
  : 
  with, 
  

   on 
  each 
  whorl, 
  about 
  33 
  to 
  35 
  small 
  obtuse 
  ribs, 
  which 
  are 
  

   obsolete 
  anteriorly 
  and 
  behind 
  the 
  labrum 
  : 
  spire 
  with 
  recti- 
  

   linear 
  outlines: 
  apex 
  truncate 
  with 
  the 
  loss 
  of 
  whorls: 
  

  

  whorls 
  remaining 
  six, 
  very 
  convex, 
  with 
  a 
  deep 
  suture: 
  aper- 
  

   ture 
  suborbicular, 
  moderately 
  efluse 
  : 
  labrum 
  well 
  e-xpanded 
  

   and 
  reflected, 
  thin 
  ; 
  linguiform 
  part 
  moderately 
  produced 
  ob- 
  

   liquely 
  on 
  the 
  side, 
  obtuse: 
  labium 
  well 
  thickened 
  and 
  regu- 
  

   larly 
  reflected, 
  slightly 
  disjunct 
  from 
  the 
  penult 
  whorl. 
  

  

  Mean 
  divergence 
  about 
  11°; 
  length 
  .25 
  inch; 
  greatest 
  

   breadth 
  .085 
  inch; 
  least 
  breadth 
  .07 
  inch. 
  

  

  Geomelania 
  PYRAMmATA. 
  Shell 
  elongate 
  conic 
  : 
  whitish 
  : 
  

   with, 
  on 
  each 
  whorl, 
  about 
  28 
  small 
  obtuse 
  ribs, 
  which, 
  on 
  

   the 
  last 
  whorl, 
  terminate 
  a 
  little 
  below 
  the 
  periphery 
  : 
  spire 
  

   with 
  rectilinear 
  outlines 
  : 
  apex 
  usually 
  truncate 
  with 
  the 
  loss 
  

   of 
  two 
  or 
  three 
  whorls 
  : 
  whorls 
  remaining 
  seven 
  or 
  eight, 
  quite 
  

  

  