﻿PLEUROTOMA. 
  Panama 
  Sliells. 
  367 
  

  

  Station. 
  — 
  Unknown, 
  

   Habitat. 
  — 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  1 
  specimen 
  of 
  this 
  elegant 
  little 
  shell 
  was 
  obtained 
  in 
  the 
  

   calcareous 
  sand 
  on 
  the 
  shore. 
  

  

  173. 
  Pleurotoma 
  ^emmulosa. 
  Nov. 
  sp. 
  

  

  Shell 
  long, 
  subfusiform: 
  brown, 
  with 
  some 
  pale 
  spots: 
  

   surface 
  densely 
  covered 
  with 
  small 
  transverse 
  and 
  spiral 
  ridges, 
  

   with 
  the 
  intersections 
  developed 
  into 
  elegantly 
  rounded 
  promi- 
  

   nent 
  nodules, 
  except 
  near 
  the 
  end 
  of 
  the 
  last 
  whorl, 
  where 
  the 
  

   transverse 
  ridges 
  are 
  obsolete 
  : 
  apex 
  acute 
  : 
  spire 
  with 
  the 
  out- 
  

   lines 
  very 
  curvilinear: 
  whorls 
  eight, 
  a 
  little 
  convex, 
  with 
  a 
  

   moderately 
  impressed 
  suture: 
  aperture 
  very 
  narrow, 
  with 
  a 
  

   small 
  sinus 
  near 
  the 
  suture 
  : 
  labrum 
  thickened 
  without 
  and 
  

   within 
  : 
  canal 
  very 
  short. 
  

  

  Mean 
  divergence 
  about 
  33° 
  ; 
  length 
  .22 
  inch 
  ; 
  breadth 
  .08 
  

   inch 
  ; 
  length 
  of 
  spire 
  .14 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   1 
  specimen 
  was 
  found. 
  

  

  174. 
  Pleurotoma 
  g^ranclimaculata. 
  Nov. 
  sp. 
  

  

  Shell 
  long, 
  ovate 
  pyramidal 
  : 
  black, 
  with 
  a 
  single 
  spiral 
  series 
  

   of 
  very 
  large 
  dingy 
  white 
  spots 
  : 
  with 
  excessively 
  minute 
  incre- 
  

   mental 
  and 
  spiral 
  stria3, 
  the 
  latter 
  of 
  which 
  are 
  obsolete 
  ante- 
  

   riorly 
  ; 
  with 
  a 
  sharp 
  simple 
  spiral 
  keel 
  a 
  little 
  below 
  the 
  suture 
  ; 
  

   a 
  little 
  below 
  the 
  middle 
  of 
  the 
  whorls 
  is 
  a 
  sharp 
  tuberculated 
  

   keel, 
  which 
  is 
  less 
  developed 
  between 
  the 
  tubercles 
  ; 
  these 
  

   tubercles 
  coincide 
  with 
  the 
  white 
  spots, 
  and 
  on 
  the 
  last 
  whorl 
  

   are 
  transversely 
  elongated 
  ; 
  on 
  the 
  last 
  whorl 
  four 
  or 
  five 
  more 
  

   spiral 
  linear 
  keels 
  are 
  seen 
  : 
  apex 
  acute 
  : 
  spire 
  conic 
  : 
  whorls 
  

   ten, 
  concave 
  between 
  the 
  keels, 
  with 
  the 
  suture 
  indistinct; 
  

   aperture 
  rather 
  narrow 
  ; 
  labrum 
  moderately 
  thickened, 
  with 
  the 
  

   sinus 
  rather 
  deep 
  : 
  labium 
  well 
  developed 
  : 
  canal 
  very 
  short. 
  

  

  