﻿COLUMBELLA. 
  Panama 
  Shells. 
  819 
  

  

  whorls 
  smooth 
  or 
  with 
  one 
  or 
  two 
  revolving 
  striae; 
  middle 
  

   whorls 
  with 
  twelve 
  to 
  fifteen 
  ribs, 
  with 
  the 
  interstices 
  spirally 
  

   striate 
  ; 
  with 
  the 
  ribs 
  and 
  stride 
  obsolete 
  on 
  the 
  back 
  of 
  the 
  last 
  

   whorl 
  ; 
  more 
  strongly 
  striated 
  anteriorly 
  : 
  apex 
  acute 
  : 
  spire 
  

   very 
  slender: 
  whorls 
  eight, 
  scarcely 
  convex, 
  with 
  the 
  suture 
  

   lightly 
  impressed 
  : 
  aperture 
  long 
  and 
  narrow 
  : 
  labrum 
  varici- 
  

   form, 
  very 
  thick, 
  sinuate 
  posteriorly, 
  crenulated 
  within 
  : 
  colu- 
  

   mellar 
  lip 
  nearly 
  smooth. 
  

  

  Mean 
  divergence 
  about 
  35° 
  ; 
  length 
  .3 
  inch 
  ; 
  breadth 
  .11 
  

   inch 
  ; 
  length 
  of 
  spire 
  .17 
  inch. 
  

  

  Station. 
  — 
  "We 
  found 
  this 
  species 
  about 
  sticks 
  and 
  stones 
  in 
  a 
  

   grove 
  of 
  trees, 
  a 
  little 
  above 
  half 
  tide 
  level. 
  

  

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

  

  68 
  specimens 
  were 
  obtained 
  about 
  two 
  miles 
  west 
  of 
  the 
  city. 
  

  

  97. 
  Coltimbella 
  nig'ricans. 
  

  

  Synonymy. 
  

  

  Columhella 
  nigricans 
  Sowb, 
  in 
  Proc. 
  Zool, 
  Soc. 
  Lond. 
  p. 
  52. 
  Mar. 
  1844. 
  

  

  Duel, 
  in 
  Chenu, 
  111, 
  Conch, 
  pi. 
  21. 
  f. 
  7, 
  8. 
  

  

  Sowb. 
  Thes. 
  Conch, 
  p. 
  143, 
  No. 
  95. 
  pi. 
  40. 
  

  

  f. 
  172. 
  

  

  Station. 
  — 
  Our 
  specimens 
  were 
  found 
  under 
  stones, 
  between 
  

   half 
  tide 
  and 
  low 
  water 
  mark. 
  

  

  Habitat. 
  — 
  Gallapago 
  Is. 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

   Gallapago 
  Is. 
  ; 
  Jay. 
  

   Taboga 
  ; 
  E. 
  Jewett 
  ! 
  Gould 
  MSS. 
  

   Panama 
  and 
  Taboga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   We 
  obtained 
  on 
  the 
  reef 
  about 
  120 
  specimens 
  of 
  large 
  size, 
  

   most 
  of 
  which 
  are 
  colored 
  as 
  described 
  by 
  Mr, 
  Sowerby. 
  

   About 
  500 
  siDccimens 
  of 
  small 
  size 
  were 
  collected, 
  among 
  which 
  

   there 
  is 
  a 
  great 
  diversity 
  of 
  coloring. 
  Many 
  have 
  a 
  white 
  spiral 
  

   band. 
  All 
  shades 
  of 
  brown 
  occur. 
  Some 
  of 
  the 
  small 
  indi- 
  

   viduals 
  are 
  likely 
  to 
  be 
  confounded 
  with 
  C. 
  jparva 
  Sowb. 
  ; 
  but 
  

  

  