﻿51 
  zvhich 
  inhabit 
  Jamaica. 
  

  

  Mean 
  divergence 
  110° 
  ; 
  greatest 
  breadth 
  .6 
  inch 
  ; 
  least 
  

   breadth 
  .05 
  inch 
  ; 
  height 
  .45 
  inch. 
  

  

  The 
  slit, 
  or 
  notch, 
  as 
  it 
  might 
  be 
  called 
  with 
  equal 
  pro- 
  

   priety, 
  is 
  uniform 
  in 
  all 
  the 
  specimens 
  before 
  me. 
  In 
  this, 
  as 
  

   in 
  most 
  other 
  characters, 
  the 
  species 
  is 
  intermediate 
  between 
  

   H. 
  hirsuta 
  and 
  H. 
  albolabris. 
  It 
  occurs 
  in 
  the 
  parish 
  of 
  

   Westmoreland, 
  the 
  west 
  part 
  of 
  the 
  island. 
  

  

  Some 
  specimens 
  from 
  the 
  opposite 
  extremity 
  of 
  the 
  island, 
  

   St. 
  Thomas 
  in 
  the 
  East, 
  closely 
  resemble 
  H. 
  consanguinea, 
  

   except 
  in 
  having 
  the 
  aperture 
  well 
  dilated 
  and 
  rounded 
  in 
  the 
  

   upper 
  part, 
  instead 
  of 
  being 
  contracted 
  by 
  a 
  sinus 
  in 
  the 
  lip 
  ; 
  

   they 
  also 
  have 
  the 
  notch 
  a 
  little 
  deeper, 
  and 
  the 
  last 
  whorl 
  is 
  

   a 
  little 
  more 
  convex 
  beneath. 
  The 
  shell 
  also 
  is 
  much 
  like 
  

   H. 
  hirstda, 
  but 
  the 
  slit 
  is 
  not 
  so 
  deep, 
  and 
  the 
  aperture 
  is 
  

   longer 
  and 
  narrower. 
  They 
  present 
  a 
  distinct 
  type, 
  but 
  I 
  

   merely 
  propose 
  for 
  it 
  the 
  name 
  of 
  soror, 
  without 
  deciding 
  

   whether 
  it 
  be 
  of 
  specific 
  value. 
  

  

  Helicina 
  microstoma. 
  Shell 
  globose 
  conic, 
  moderately 
  

   thickened 
  : 
  " 
  brown, 
  shaded 
  off 
  to 
  a 
  smoky 
  white 
  along 
  the 
  

   suture 
  " 
  and 
  on 
  the 
  periphery 
  of 
  the 
  last 
  whorl 
  : 
  with 
  rather 
  

   light 
  striae 
  of 
  growth, 
  in 
  which 
  are 
  a 
  few 
  spiral 
  series 
  of 
  

   punctures 
  : 
  apex 
  obtuse 
  : 
  spire 
  with 
  the 
  outlines 
  more 
  or 
  less 
  

   and 
  not 
  uniformly 
  curvilinear 
  : 
  whorls 
  rather 
  less 
  than 
  five, 
  

   moderately 
  convex, 
  with 
  a 
  well 
  impressed 
  suture 
  ; 
  last 
  whorl 
  

   subplanulate 
  beneath 
  : 
  aperture 
  semi-elliptical, 
  compressed 
  

   above 
  and 
  below, 
  laterally 
  dilated 
  ; 
  with 
  the 
  lip 
  sinuate, 
  well 
  

   expanded 
  and 
  reflected 
  except 
  at 
  the 
  extremities 
  ; 
  with 
  the 
  

   slit 
  not 
  very 
  deep, 
  rather 
  wide. 
  

  

  Mean 
  divergence 
  60° 
  ; 
  greatest 
  breadth 
  .65 
  inch 
  ; 
  least 
  

   breadth 
  .52 
  inch 
  ; 
  height 
  .4 
  inch. 
  

  

  The 
  slit 
  is 
  about 
  as 
  deep 
  as 
  in 
  H. 
  consanguinea, 
  but 
  the 
  

   sides 
  are 
  less 
  divergent. 
  The 
  punctate 
  spiral 
  series 
  indicate 
  

   spiral 
  lines 
  of 
  hairs 
  on 
  the 
  epidermis. 
  For 
  two 
  faded 
  speci- 
  

  

  