﻿464 
  Panama 
  Shells. 
  fissurellid^. 
  

  

  Station. 
  — 
  On 
  rocks 
  above 
  and 
  below 
  half 
  tide 
  level. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  Sowerby. 
  

  

  Peru 
  ; 
  Yoyage 
  of 
  the 
  Venus. 
  

   Gallapago 
  Is. 
  ; 
  Jay. 
  

   Taboga 
  ; 
  0. 
  B. 
  A. 
  

   220 
  specimens 
  were 
  collected. 
  

  

  Nearly 
  one 
  half 
  of 
  the 
  specimens, 
  which 
  we 
  have 
  included 
  

   in 
  this 
  species, 
  are 
  intermediate 
  between 
  this 
  and 
  S. 
  characteristica. 
  

   There 
  is 
  so 
  little 
  constancy 
  in 
  the 
  two 
  forms, 
  that 
  the 
  distinction 
  

   is 
  a 
  source 
  of 
  much 
  perplexity. 
  

  

  365. 
  8iplionaria 
  maura. 
  

  

  Synonymy. 
  

  

  Siphonaria 
  maura 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  V. 
  Jan. 
  1835. 
  

   Reeve 
  Elem. 
  Conch, 
  pi. 
  24. 
  f. 
  144 
  ? 
  1848 
  ? 
  

  

  Station. 
  — 
  On 
  rocks 
  ; 
  Cuming 
  ! 
  Sowerby. 
  Our 
  specimens 
  were 
  

   found 
  on 
  ledges 
  of 
  rocks, 
  mostly 
  above 
  half 
  tide 
  level. 
  

  

  Hohitat. 
  — 
  Panama; 
  Cuming! 
  Sowerby. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   200 
  specimens 
  were 
  collected. 
  

  

  366. 
  Siphonaria 
  pica? 
  

  

  Synonymy. 
  

   Siphonaria 
  pica 
  (?) 
  Sowh. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  6. 
  Jan. 
  1835. 
  

   Station. 
  — 
  On 
  rocks 
  in 
  exposed 
  situations 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

  

  Habitat. 
  — 
  Acapulco; 
  Cuming! 
  Sowerby. 
  

  

  Panama 
  ; 
  Jay. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   3 
  specimens 
  were 
  found. 
  

  

  Is 
  not 
  Mr. 
  Sowerby 
  in 
  error 
  when 
  he 
  represents 
  Mr. 
  Cuming 
  

   as 
  having 
  made 
  collections 
  at 
  Acapulco 
  ? 
  

  

  