﻿JNTRODucTioN. 
  Panama 
  Shells. 
  231 
  

  

  limits, 
  out 
  of 
  which 
  they 
  never 
  have 
  been 
  found. 
  With 
  most 
  

   of 
  the 
  littoral 
  species, 
  these 
  limits 
  are 
  extremely 
  narrow. 
  

   The 
  following 
  is 
  a 
  list 
  of 
  the 
  species 
  which 
  we 
  collected 
  at 
  

   Panama 
  and 
  Taboga, 
  w4iich 
  occur 
  also 
  at 
  the 
  Gallapagos, 
  

   with 
  a 
  statement 
  of 
  their 
  habits 
  of 
  station. 
  

  

  Cypraa 
  rubescens 
  ; 
  under 
  stones, 
  

  

  Mitra 
  trhtis 
  ; 
  at 
  the 
  depth 
  of 
  6 
  to 
  10 
  fathoms 
  of 
  sandy 
  

   mud 
  ; 
  also 
  under 
  stones, 
  near 
  low 
  water 
  mark. 
  

  

  Planaxis 
  planicostata 
  ; 
  under 
  stones, 
  between 
  high 
  water 
  

   and 
  half 
  tide 
  level. 
  

  

  Purpura 
  Carolensis 
  ; 
  under 
  stones, 
  at 
  low 
  water 
  mark. 
  

  

  Columbella 
  atramenlaria 
  ; 
  under 
  stones, 
  at 
  low 
  water 
  

   mark. 
  

  

  Columbella 
  bicanalifera 
  ; 
  sandy 
  mud, 
  in 
  10 
  fathoms 
  

   water. 
  

  

  Columbella 
  haemastomoj 
  ; 
  under 
  stones. 
  

  

  Columbella 
  nigricans 
  ; 
  under 
  stones, 
  between 
  half 
  tide 
  

   and 
  low 
  Water 
  mark. 
  

  

  Ricinula 
  Reeviana 
  ; 
  under 
  stones, 
  near 
  low 
  water 
  mark. 
  

  

  Cassis 
  coarctala 
  ; 
  in 
  crevices 
  of 
  rocks. 
  

  

  Oniscia 
  tuberculosa 
  ; 
  in 
  clefts 
  of 
  rocks, 
  at 
  low 
  water 
  

   mark. 
  

  

  Conus 
  brunneus 
  ; 
  in 
  clefts 
  of 
  rocks, 
  at 
  low 
  water 
  mark. 
  

  

  C 
  onus 
  mix 
  ; 
  station 
  unknown. 
  

  

  Strombus 
  granulatus 
  ; 
  sandy 
  mud, 
  at 
  the 
  depth 
  of 
  6 
  to 
  8 
  

   fathoms. 
  

  

  Turbinella 
  cerala 
  ; 
  under 
  stones 
  and 
  in 
  the 
  crevices 
  of 
  

   rocks, 
  at 
  low 
  water 
  mark. 
  

  

  Pleurotoma 
  excentrica 
  ; 
  coral 
  sand, 
  at 
  the 
  depth 
  of 
  6 
  

   fathoms. 
  

  

  Hipponyx 
  radiata 
  ; 
  attached 
  to 
  stones, 
  near 
  low 
  water 
  

   mark. 
  

  

  Fissurella 
  macrotrema 
  ; 
  under 
  stones, 
  on 
  the 
  shore. 
  

  

  