﻿COLUMBELLA. 
  Panama 
  Shells. 
  321 
  

  

  100. 
  Coliiiiibella 
  pyg^maea. 
  

  

  Synonymy. 
  

  

  Columbella 
  j)yg'mcea 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  119. 
  June 
  1832. 
  

  

  Mvill. 
  Synop. 
  Nov. 
  Test. 
  Viv. 
  p. 
  90. 
  May 
  1836. 
  

  

  Sowb 
  Thes. 
  Conch, 
  p. 
  141. 
  No. 
  89. 
  pi. 
  

  

  40. 
  f. 
  163. 
  1844. 
  

  

  Station. 
  — 
  On 
  dead 
  shells 
  in 
  sandj 
  mud, 
  at 
  a 
  depth 
  of 
  10 
  

   fathoms 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

  

  Our 
  specimens 
  were 
  found 
  under 
  stones 
  at 
  low 
  water 
  mark. 
  

  

  Habitat. 
  — 
  St. 
  Elena 
  ; 
  Cuming 
  ! 
  Sowerby 
  : 
  also 
  Miiller. 
  

  

  St. 
  Elena 
  ; 
  Jay. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   We 
  collected 
  on 
  the 
  reef 
  185 
  specimens 
  of 
  this 
  pretty 
  species. 
  

  

  101. 
  Columbella 
  riig^osa. 
  

  

  Synonymy. 
  

  

  Columbella 
  rugosa 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  115. 
  June 
  1832. 
  

  

  Miill. 
  Synops. 
  Nov. 
  Test. 
  Viv. 
  p. 
  84. 
  1836. 
  

  

  Sowerhyi 
  Dud. 
  in 
  Chenu, 
  111. 
  Conch, 
  pi 
  19. 
  f. 
  6. 
  6. 
  ? 
  1843. 
  

  

  bkolor 
  Kiener 
  Iconog. 
  p. 
  46. 
  pi. 
  16. 
  f. 
  4.? 
  

  

  rurjosa 
  Sowb. 
  Thes. 
  Conch, 
  p. 
  130. 
  No. 
  53. 
  pi. 
  38. 
  

  

  f. 
  114-5. 
  1844. 
  

  

  There 
  are 
  three 
  principal 
  varieties, 
  which 
  freely 
  graduate 
  

   into 
  each 
  other. 
  The 
  first 
  has 
  a 
  few 
  distant 
  tubercles 
  on 
  the 
  

   lower 
  whorls 
  : 
  the 
  second 
  has 
  ribs 
  on 
  the 
  first 
  part 
  of 
  the 
  last 
  

   whorls, 
  but 
  they 
  are 
  rather 
  short 
  and 
  wide 
  : 
  in 
  the 
  third 
  these 
  

   ribs 
  of 
  the 
  last 
  whorl 
  are 
  narrow 
  and 
  long. 
  Specimens 
  of 
  a 
  

   diminutive 
  size 
  are 
  very 
  common. 
  About 
  two 
  thirds 
  of 
  those 
  

   which 
  we 
  collected 
  are 
  from 
  .60 
  inch 
  to 
  .75 
  inch 
  long 
  ; 
  about 
  

   one 
  fourth 
  of 
  them 
  range 
  from 
  .35 
  inch 
  to 
  .50 
  inch 
  in 
  

   length. 
  The 
  epidermis 
  is 
  brown, 
  and 
  very 
  thin 
  but 
  tough. 
  

  

  Station. 
  — 
  Under 
  stones 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

   Our 
  specimens 
  were 
  found 
  under 
  stones 
  between 
  half 
  tide 
  

   and 
  the 
  low 
  water 
  mark 
  of 
  neap 
  tides. 
  

  

  