﻿480 
  Panama 
  Shells. 
  aecid^. 
  

  

  Hahitat, 
  — 
  Panama 
  ; 
  Cuming 
  ! 
  Sowerby 
  : 
  also 
  Miiller. 
  

  

  Panama 
  ; 
  Deshayes 
  : 
  also 
  Hanley. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   10 
  odd 
  valves 
  were 
  found. 
  

  

  411. 
  Pectunculus 
  assimilis. 
  

  

  Synonymy. 
  

  

  Pectunculus 
  assimilis 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  196, 
  Dec. 
  1832. 
  

  

  Mull. 
  Syn. 
  Test. 
  Viv. 
  p. 
  189. 
  1836. 
  

  

  Reeve 
  Conch. 
  Icon. 
  pi. 
  4. 
  f. 
  15. 
  Mar. 
  1843. 
  

  

  Orb. 
  Voy. 
  Amer. 
  Merid. 
  Moll. 
  p. 
  629. 
  1846. 
  

  

  In 
  the 
  number, 
  width, 
  and 
  form 
  of 
  the 
  cross 
  bands 
  of 
  brown 
  

   our 
  specimens 
  are 
  so 
  variable 
  that 
  no 
  two 
  are 
  alike, 
  and 
  two 
  

   of 
  them 
  have 
  most 
  of 
  the 
  ground 
  color 
  of 
  a 
  greyish 
  blue. 
  In 
  

   respect 
  of 
  coloring, 
  therefore, 
  the 
  species 
  does 
  not 
  appear 
  to 
  be 
  

   well 
  distinguished 
  from 
  P. 
  inequalis. 
  Nor 
  is 
  the 
  distinction 
  in 
  

   sculpture 
  much 
  more 
  constant. 
  

  

  Station. 
  — 
  In 
  sandy 
  mud 
  and 
  gravel, 
  in 
  from 
  8 
  to 
  12 
  fathoms 
  ; 
  

   Cuming 
  ! 
  Sowerby 
  : 
  also 
  Eeeve. 
  

  

  Our 
  specimens 
  were 
  found 
  under 
  stones, 
  in 
  calcareous 
  gravel, 
  

   between 
  one 
  quarter 
  tide 
  and 
  low 
  water 
  mark. 
  

  

  Habitat. 
  — 
  Puerto 
  Portrero, 
  Bay 
  of 
  Guayaquil, 
  Central 
  Ame- 
  

   rica 
  ; 
  Cuming 
  ! 
  Sowerby 
  : 
  also 
  Miiller 
  : 
  also 
  

   Eeeve: 
  also 
  Orbigny. 
  

   Guayaquil 
  ; 
  Jay. 
  

  

  Mazatlan 
  ; 
  Lt. 
  Green 
  ! 
  Gould 
  MSS. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   20 
  specimens 
  were 
  collected 
  on 
  the 
  reef. 
  

   A 
  common 
  ambiguity 
  again 
  appears 
  in 
  Mr. 
  Sowerby's 
  state- 
  

   m.ent 
  ; 
  since 
  the 
  Bay 
  of 
  Guayaquil 
  (and 
  Puerto 
  Portrero 
  ?) 
  is 
  not 
  

   in 
  Central 
  America, 
  is 
  the 
  latter 
  mentioned 
  as 
  a 
  third 
  locality 
  ? 
  

  

  