﻿418 
  Panama 
  Shells. 
  trochid^. 
  

  

  Acapulco 
  ; 
  Humboldt 
  & 
  Bonpland 
  ! 
  Yalenciennes. 
  

  

  California; 
  Philippi. 
  

  

  West 
  Coast 
  of 
  Mexico 
  and 
  Central 
  America 
  ; 
  

  

  Kiister. 
  

   Taboga 
  and 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   On 
  tlie 
  reef 
  at 
  Panama 
  we 
  collected 
  5 
  specimens 
  ; 
  at 
  Taboga 
  

   we 
  collected 
  500. 
  

  

  280. 
  Trocliiit^ 
  reticulatus. 
  

  

  Synonymy. 
  

  

  Trockus 
  reticulatus 
  Wood 
  Ind. 
  Test. 
  Supp. 
  pi. 
  6. 
  f. 
  38. 
  1828. 
  

   Kust. 
  Conch. 
  Cab. 
  pi. 
  14. 
  f. 
  10. 
  1847. 
  

  

  Station. 
  — 
  Under 
  stones 
  at 
  the 
  low 
  water 
  mark 
  of 
  the 
  neap 
  

   tides. 
  

  

  Habitat. 
  — 
  Unknown 
  ; 
  Wood. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   We 
  collected 
  600 
  specimens 
  on 
  the 
  reef. 
  

  

  TURBO. 
  — 
  The 
  difference 
  between 
  the 
  shells 
  of 
  Turbo 
  and 
  

   of 
  Trochus 
  is 
  of 
  little 
  value. 
  The 
  peculiarities 
  of 
  form, 
  which 
  

   distinguish 
  these 
  genera, 
  are 
  not 
  only 
  inconsiderable 
  and 
  ill 
  

   defined, 
  but 
  they 
  are 
  also 
  unaccompanied 
  with 
  corresponding 
  

   differences 
  in 
  the 
  texture, 
  sculpture, 
  or 
  other 
  characters 
  of 
  the 
  

   shells, 
  or 
  in 
  the 
  characters 
  of 
  the 
  soft 
  parts 
  of 
  the 
  animals. 
  A 
  

   great 
  number 
  of 
  other 
  genera 
  present 
  in 
  each 
  a 
  difference 
  of 
  

   outline 
  equal 
  to 
  that 
  which 
  here 
  is 
  made 
  the 
  ground 
  of 
  generic 
  

   distinction. 
  

  

  The 
  calcareous 
  and 
  the 
  horny 
  opercula 
  present 
  a 
  well 
  defined 
  

   character. 
  This 
  distinction, 
  however, 
  is 
  not 
  accompanied 
  by 
  

   corresponding 
  differences 
  in 
  the 
  shells 
  and 
  in 
  the 
  soft 
  parts, 
  and 
  

   therefore 
  cannot 
  be 
  regarded 
  as 
  of 
  much 
  zoological 
  value. 
  But 
  

   on 
  account 
  of 
  its 
  convenience 
  we 
  shall 
  for 
  the 
  present 
  distin- 
  

   guish 
  these 
  genera 
  by 
  this 
  character. 
  

  

  