﻿SCALARIA. 
  Panama 
  Shells. 
  421 
  

  

  Mr. 
  Keeve, 
  in 
  referring 
  only 
  to 
  the 
  MSS. 
  of 
  a 
  private 
  collec- 
  

   tion 
  for 
  the 
  name 
  of 
  this 
  species, 
  appears 
  to 
  have 
  overlooked 
  the 
  

   name 
  and 
  the 
  tolerably 
  correct 
  figure 
  in 
  Wood's 
  Index. 
  Three 
  

   extreme 
  varieties 
  are 
  well 
  represented 
  by 
  the 
  figures 
  in 
  the 
  

   Conch. 
  Icon. 
  Most 
  of 
  our 
  specimens 
  are 
  intermediate 
  between 
  

   fig. 
  a 
  and 
  fig. 
  Z>, 
  having 
  a 
  second 
  row 
  of 
  tubercles 
  moderately 
  

   developed 
  above 
  the 
  middle 
  of 
  the 
  last 
  whorl, 
  with 
  a 
  corres- 
  

   ponding 
  keel 
  on 
  the 
  spire. 
  

  

  The 
  operculum 
  is 
  very 
  thick 
  and 
  deeply 
  sculptured, 
  A 
  deep 
  

   indentation 
  corresponds 
  to 
  the 
  apex, 
  and 
  deep 
  narrow 
  farrows 
  

   occupy 
  arcs 
  of 
  about 
  300° 
  ; 
  of 
  these 
  furrows, 
  the 
  larger 
  is 
  mid- 
  

   way 
  between 
  the 
  apex 
  and 
  the 
  margin, 
  and 
  three 
  others 
  are 
  

   exterior 
  to 
  it. 
  The 
  surface 
  is 
  granular, 
  and 
  the 
  sides 
  of 
  the 
  fur- 
  

   rows 
  are 
  rugose. 
  

  

  Station. 
  — 
  On 
  rocks, 
  not 
  far 
  from 
  the 
  low 
  water 
  mark 
  of 
  the 
  

   neap 
  tides. 
  

  

  Habitat 
  — 
  Unknown 
  ; 
  Wood. 
  

  

  West 
  Columbia 
  ; 
  Cuming 
  ! 
  Eeeve. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   We 
  collected 
  160 
  specimens 
  on 
  the 
  reef 
  at 
  Panama. 
  Half 
  

   grown 
  shells 
  were 
  numerous. 
  

  

  285. 
  8calaria 
  hexag^ona. 
  

  

  Synonymy. 
  

  

  Scalaria 
  hexagona 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  29. 
  Feb. 
  1844. 
  

  

  Sowb. 
  Thes. 
  Conch, 
  p. 
  98. 
  No. 
  60. 
  pi. 
  

  

  33. 
  f. 
  67. 
  1844, 
  

  

  Station. 
  — 
  In 
  the 
  sands 
  ; 
  Sowerby. 
  

  

  Habitat 
  — 
  Acapulco; 
  Col. 
  Moffat! 
  Sowerby. 
  

  

  Acapulco; 
  Jay. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  I 
  

   1 
  specimen 
  was 
  found. 
  

  

  