﻿84 
  Descriptions 
  of 
  Neiv 
  Species 
  and 
  Varieties 
  of 
  Shells, 
  

  

  convex, 
  with 
  a 
  deep 
  suture 
  : 
  aperture 
  widely 
  ovate, 
  mnderately 
  

   effuse: 
  labrum 
  rather 
  thin, 
  slightly 
  reflected 
  : 
  linguiforrn 
  part 
  

   obtuse, 
  moderately 
  produced 
  laterally 
  at 
  the 
  lower 
  part 
  of 
  the 
  

   right 
  side: 
  lai/ium 
  a 
  little 
  thiclcened 
  and 
  reflected. 
  

  

  Mean 
  divergence 
  about 
  .15° 
  ; 
  length 
  32 
  inch 
  ; 
  greatest 
  

   breadth 
  .11 
  inch 
  ; 
  least 
  breadth 
  .09 
  inch. 
  

  

  Geomelania 
  costulosa, 
  G. 
  exilis, 
  G. 
  Hilliana, 
  and 
  G. 
  stri- 
  

   osa 
  are 
  as 
  yet 
  unique 
  in 
  the 
  collection 
  of 
  the 
  Hon. 
  Edward 
  

   Chitty. 
  G. 
  conica 
  is 
  unique 
  in 
  the 
  Zoological 
  Museum 
  of 
  

   Amherst 
  College. 
  

  

  Cylindrella 
  Agnesiana, 
  var. 
  diminuta. 
  "We 
  are 
  indebted 
  

   to 
  Dr. 
  A. 
  Barrett 
  for 
  this 
  remarkably 
  small 
  variety, 
  with 
  the 
  

   following 
  dimensions 
  : 
  length 
  after 
  truncation 
  .67 
  inch 
  ; 
  

   breadth 
  .22 
  inch. 
  In 
  the 
  specimens 
  before 
  us 
  the 
  lip 
  is 
  but 
  

   slightly 
  expanded. 
  It 
  inhabits 
  Flamstead, 
  in 
  the 
  Port 
  Royal 
  

   Mountains. 
  

  

  Cylindrella 
  Robertsl 
  Shell 
  elongate, 
  fusiform, 
  widest 
  

   a 
  little 
  below 
  the 
  middle 
  : 
  pearl 
  white 
  : 
  with, 
  on 
  each 
  side 
  of 
  

   the 
  suture, 
  a 
  series 
  of 
  very 
  short 
  transverse 
  prominent 
  ribs, 
  

   which 
  abruptly 
  terminate 
  so 
  as 
  to 
  leave 
  a 
  large 
  portion 
  of 
  the 
  

   middle 
  of 
  the 
  whorls 
  smooth 
  ; 
  ribs 
  about 
  fifteen 
  on 
  each 
  

   whorl 
  ; 
  the 
  series 
  below 
  the 
  suture 
  being 
  the 
  larger 
  ; 
  both 
  

   series 
  are 
  continued 
  on 
  the 
  two 
  angles 
  of 
  the 
  produced 
  part 
  

   of 
  the 
  last 
  whorl, 
  over 
  on 
  the 
  back 
  part 
  of 
  which 
  each 
  rib 
  is 
  uni- 
  

   ted 
  to 
  its 
  opposite 
  by 
  a 
  small 
  lamella 
  : 
  spire 
  with 
  the 
  outlines 
  

   quite 
  convex 
  except 
  in 
  the 
  upper 
  third 
  : 
  apex 
  truncate 
  with 
  

   the 
  loss 
  of 
  — 
  whorls 
  : 
  whorls 
  remaining 
  nine 
  or 
  ten, 
  planu- 
  

   late 
  or 
  slightly 
  concave, 
  with 
  a 
  deep 
  suture 
  ; 
  last 
  whorl 
  widely 
  

   disjunct 
  in 
  its 
  last 
  third 
  part 
  from 
  the 
  penult 
  whorl, 
  with 
  an 
  

   angle 
  on 
  the 
  right 
  and 
  another 
  on 
  the 
  lower 
  side 
  : 
  aperture 
  

   subangular 
  above 
  and 
  below, 
  more 
  angular 
  on 
  the 
  right 
  : 
  lip 
  

   rather 
  thin, 
  reflected 
  into 
  the 
  plane 
  of 
  the 
  aperture, 
  moderately 
  

   expanded. 
  

  

  Length 
  .37 
  inch 
  ; 
  breadth 
  .095 
  inch. 
  

  

  