﻿282 
  Panama 
  Shells 
  purpurid^. 
  

  

  Acapulco; 
  Humboldt 
  and 
  Bonpland 
  ! 
  Yalenciennes. 
  

   "West 
  coast 
  of 
  Mexico 
  ; 
  Say 
  in 
  Catal. 
  Mus. 
  

   Mexico, 
  California, 
  Panama 
  ; 
  Duclos. 
  

   Panama 
  ; 
  Cuming 
  ! 
  Reeve 
  : 
  also 
  Morch. 
  

   Panama 
  ; 
  Jay. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  I 
  

  

  We 
  collected 
  4,500 
  specimens. 
  

  

  42. 
  Planaxis 
  planlcostata* 
  

  

  Synonymy. 
  

  

  Planaxis 
  planicostata 
  Sowb. 
  in 
  Tank, 
  Catal. 
  No. 
  1418. 
  App. 
  p. 
  13. 
  1825. 
  

   Buccinum 
  planaxis 
  Wood 
  Ind. 
  Test. 
  Supp, 
  pi. 
  4. 
  f. 
  15. 
  1828. 
  

  

  Planaxis 
  canalkulata'DuvaX 
  'n\'^Q\.Zoo\. 
  - 
  - 
  Apr. 
  1840. 
  

  

  Trosch. 
  in 
  Wiegm. 
  Arcbiv. 
  p. 
  271. 
  1840. 
  

  

  planicostata 
  Reeve 
  Elem. 
  Concb. 
  pi. 
  B. 
  f. 
  IV. 
  1846. 
  

  

  The 
  epidermis 
  of 
  this 
  shell 
  is 
  exceedingly 
  thick 
  and 
  tena- 
  

   cious, 
  and 
  of 
  a 
  dingy 
  olive 
  green. 
  Beneath 
  the 
  epidermis 
  the 
  

   shell 
  is 
  black, 
  but 
  near 
  the 
  apex 
  and 
  in 
  faded 
  specimens 
  the 
  

   color 
  is 
  brown. 
  All 
  the 
  specimens 
  at 
  Panama 
  and 
  in 
  one 
  spot 
  

   at 
  Taboga 
  belong 
  to 
  a 
  large 
  variety, 
  and 
  are 
  often 
  more 
  than 
  

   an 
  inch 
  long. 
  The 
  others 
  at 
  Taboga 
  were 
  mostly 
  from 
  .6 
  inch 
  

   to 
  .7 
  inch 
  long. 
  

  

  Station. 
  — 
  Under 
  stones 
  between 
  high 
  water 
  and 
  half 
  tide 
  

   level. 
  

  

  Habitat. 
  — 
  G-allapago 
  Is. 
  ; 
  Sowerby 
  : 
  also 
  Duval 
  : 
  also 
  Jay. 
  

   Panama 
  ; 
  E. 
  Jewett 
  ! 
  Gould 
  Mss. 
  

   Taboga 
  and 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  At 
  Taboga 
  in 
  incredible 
  numbers 
  : 
  less 
  common 
  on 
  the 
  

   reef 
  at 
  Panama. 
  We 
  collected 
  about 
  1200 
  specimens. 
  

  

  