﻿384 
  Panama 
  Shdls. 
  littorinid^ 
  

  

  Family— 
  LITTORmiD^. 
  

  

  210. 
  Turritella 
  Banksii. 
  

  

  Synonymy. 
  

   Turritella 
  Banksii 
  Reeve 
  Conch, 
  Icon. 
  pi. 
  4. 
  f. 
  15. 
  May 
  1849. 
  

  

  Station. 
  — 
  Sandy 
  mud 
  at 
  the 
  depth 
  of 
  10 
  fathoms 
  ; 
  Cuming 
  I 
  

   Eeeve. 
  

  

  Between 
  the 
  low 
  water 
  mark 
  of 
  the 
  neap 
  tides 
  and 
  that 
  of 
  

   the 
  spring 
  tides, 
  this 
  species 
  was 
  found 
  living 
  in 
  the 
  calcareous 
  

   sand 
  among 
  and 
  under 
  stones. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  Cuming 
  ! 
  Eeeve. 
  

   Panama; 
  C. 
  B. 
  A. 
  f 
  

  

  On 
  the 
  reef 
  we 
  collected 
  about 
  350 
  specimens, 
  one-third 
  of 
  

   which 
  were 
  taken 
  alive. 
  

  

  This 
  species 
  is 
  remarkable 
  for 
  the 
  diversity 
  of 
  color 
  in 
  

   different 
  individuals. 
  Some 
  are 
  nearly 
  black 
  and 
  are 
  but 
  

   slightly 
  variegated 
  ; 
  others 
  are 
  mostly 
  white^ 
  mottled 
  with 
  a 
  few 
  

   irregular 
  blackish 
  spots 
  ; 
  many 
  are 
  ornamented 
  with 
  a 
  profu- 
  

   sion 
  of 
  irregular 
  greyish 
  and 
  blackish 
  spots 
  on 
  a 
  light 
  ground 
  ; 
  

   and 
  a 
  few 
  are 
  brown. 
  Not 
  less 
  than 
  20 
  individuals 
  would 
  be 
  

   required 
  to 
  exhibit 
  fairly 
  this 
  diversity 
  of 
  coloring. 
  

  

  CCECU]fI» 
  — 
  A 
  European 
  type 
  of 
  this 
  extraordinary 
  genus 
  

   has 
  long 
  been 
  known 
  under 
  the 
  name 
  of 
  Dentalium 
  trachea. 
  In 
  

   1849, 
  Mr. 
  Clark 
  of 
  Exmouth, 
  England, 
  described 
  the 
  soft 
  parts 
  in 
  

   the 
  Ann. 
  and 
  Mag. 
  of 
  Nat. 
  Hist. 
  Mr. 
  C. 
  considered 
  the 
  animal 
  

   to 
  be 
  kindred 
  to 
  Rissoa. 
  In 
  the 
  Proc. 
  Bost. 
  Soc. 
  Nat. 
  Hist. 
  Oct. 
  

   15, 
  1851, 
  Mr. 
  "William 
  Stimpson 
  has 
  described 
  three 
  American 
  

   species, 
  of 
  which 
  one 
  inhabits 
  Massachusetts, 
  and 
  two 
  inhabit 
  

   Florida. 
  For 
  some 
  time 
  we 
  have 
  possessed 
  several 
  undescribed 
  

   species 
  which 
  we 
  collected 
  in 
  Jamaica. 
  Now 
  we 
  offer 
  descrip- 
  

   tions 
  of 
  eight 
  species 
  from 
  Panama. 
  It 
  is 
  probable 
  therefore 
  

   that 
  the 
  genus 
  is 
  well 
  represented 
  on 
  this 
  continent* 
  

  

  