﻿3PLEUR0T0MA, 
  Panama 
  Shells, 
  363 
  

  

  granules 
  next 
  above 
  the 
  suture, 
  and 
  a 
  not 
  very 
  prominent 
  keel 
  

   above 
  tlie 
  middle 
  of 
  the 
  whorls 
  ; 
  on 
  the 
  last 
  whorl 
  three 
  other 
  

   ■keels 
  appear, 
  which 
  are 
  more 
  or 
  less 
  granulated; 
  apex 
  very- 
  

   acute 
  : 
  spire 
  with 
  convex 
  outlines: 
  whorls 
  eleven, 
  angular 
  un- 
  

   der 
  the 
  spiral 
  keel, 
  beneath 
  it 
  concave, 
  with 
  an 
  indistinct 
  suture 
  : 
  

   -aperture 
  long, 
  with 
  a 
  rather 
  deep 
  sinus 
  .: 
  canal 
  very 
  short, 
  wide. 
  

   This 
  species 
  has 
  some 
  resemblance 
  to 
  P. 
  discors. 
  It 
  must 
  also 
  

   resemble 
  P. 
  Melchersi 
  Menke, 
  Zeitschr. 
  1851. 
  p. 
  20. 
  

  

  Mean 
  divergence 
  about 
  88°.; 
  length 
  .8 
  inch.; 
  breadth 
  .28 
  

   inch 
  ; 
  length 
  of 
  spire 
  .5 
  inch. 
  

  

  Station. 
  — 
  Unknown, 
  

  

  Habitat 
  — 
  ^Panama; 
  C. 
  B. 
  A.l 
  

   Only 
  1 
  specimen 
  was 
  obtained. 
  

  

  165. 
  Pleurotoma 
  bicanalifera. 
  

  

  Synonymy. 
  

  

  Pleurotoma 
  hicanaii/era 
  Sowb. 
  iu 
  Proc. 
  Zool. 
  Soc. 
  Lond, 
  

  

  p. 
  136. 
  . 
  - 
  - 
  - 
  Dec. 
  1833, 
  

  

  Miill. 
  Sjmop. 
  Nov. 
  Test. 
  ¥iv. 
  p. 
  

  

  112. 
  ----- 
  May 
  1836. 
  

  

  Reeve 
  Conch. 
  Icon. 
  pi. 
  12. 
  f. 
  103. 
  May 
  1843. 
  

  

  Station. 
  — 
  Sandy 
  mud 
  at 
  a 
  depth 
  of 
  10 
  fathoms 
  ; 
  Cuming 
  ! 
  

   Sowerby 
  : 
  also 
  Reeve, 
  

  

  Habitat— 
  Shores 
  of 
  Central 
  America 
  ; 
  Cuming 
  I 
  Sowerby 
  : 
  

   also 
  Miiller. 
  

  

  Bay 
  of 
  Montija.; 
  Cuming 
  ! 
  Eeeve. 
  

  

  Taboga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   We 
  found 
  only 
  1 
  specimen. 
  

  

  166. 
  Pleurotoma 
  collaris. 
  

  

  Synonymy. 
  

  

  Pleurotoma 
  collaris 
  Sowh. 
  in 
  'Proc. 
  Zool. 
  Soc. 
  Lond. 
  

  

  p. 
  13S. 
  Dec. 
  lS33i^ 
  

  

  