﻿434 
  Panama 
  Shells. 
  auriculid^. 
  

  

  upper 
  part 
  of 
  tlie 
  lower 
  whorls 
  compressed 
  ; 
  last 
  whorl 
  sub- 
  

   angular 
  next 
  below 
  the 
  compressed 
  part 
  : 
  aperture 
  rather 
  long, 
  

   very 
  acute 
  above: 
  labrum 
  moderately 
  thickened 
  but 
  not 
  reflected 
  : 
  

   with 
  three 
  plaits 
  on 
  the 
  left 
  side, 
  of 
  which 
  the 
  middle 
  one 
  is 
  

   larger 
  and 
  the 
  lower 
  one 
  is 
  the 
  least 
  ; 
  sometimes 
  with 
  a 
  small 
  

   toothlike 
  plait 
  on 
  the 
  right 
  side. 
  

  

  The 
  general 
  form 
  varies, 
  as 
  will 
  be 
  seen 
  in 
  the 
  following 
  

   dimensions 
  of 
  two 
  specimens, 
  the 
  first 
  number 
  expressing 
  the 
  

   mean 
  divergence, 
  the 
  second 
  the 
  length, 
  the 
  third 
  the 
  breadth, 
  

   and 
  the 
  fourth 
  the 
  length 
  of 
  the 
  spire 
  : 
  — 
  

  

  50° 
  ; 
  .44 
  inch 
  ; 
  .17 
  inch 
  ; 
  .23 
  inch. 
  

  

  65°; 
  .37 
  " 
  ; 
  .2 
  " 
  ; 
  .13 
  " 
  

  

  Station. 
  — 
  Under 
  stones, 
  at 
  high 
  water 
  mark 
  ; 
  or 
  crawling 
  

   over 
  wet 
  stones. 
  

  

  Habitat. 
  — 
  Panama 
  and 
  Taboga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   650 
  specimens 
  were 
  collected 
  near 
  the 
  sea 
  wall 
  of 
  Panama, 
  

   where 
  the 
  species 
  was 
  most 
  abundant. 
  

  

  313. 
  Auricula 
  stagnalis. 
  

  

  Synonymy. 
  

  

  Auricula 
  slagnalis 
  Orb. 
  in 
  Guerin 
  Mag. 
  Zool. 
  Synop. 
  

  

  p. 
  23.* 
  ----- 
  July 
  1835. 
  

  

  Reeve 
  Conch, 
  ^yst. 
  pi. 
  187. 
  f. 
  9. 
  {too 
  narrow.) 
  1842. 
  

  

  Orb. 
  Voy. 
  Am. 
  Mer. 
  p. 
  325. 
  pi. 
  42. 
  f. 
  V, 
  8. 
  1846. 
  

  

  ~ 
  painllifera 
  Kiist. 
  p. 
  25. 
  ) 
  e 
  a 
  ^ 
  in* 
  

  

  — 
  slagnalis 
  Kiist. 
  p. 
  70. 
  j 
  ^ 
  " 
  ' 
  ' 
  ' 
  ' 
  

  

  Station. 
  — 
  In 
  a 
  marsh, 
  and 
  even 
  in 
  stagnant 
  fresh 
  water 
  ; 
  M. 
  

   Fontaine 
  ! 
  Orbigny. 
  

  

  Our 
  specimens 
  were 
  found 
  under 
  a 
  heap 
  of 
  stones 
  just 
  above 
  

   high 
  water 
  mark. 
  

  

  * 
  The 
  vol. 
  of 
  the 
  Mag. 
  is 
  not 
  paged 
  continuously, 
  nor 
  are 
  the 
  new 
  species 
  of 
  

   Mollusea, 
  which 
  are 
  described 
  by 
  D'Orbigny, 
  enumerated 
  in 
  the 
  Table 
  Methodique. 
  

   Kiister 
  appears 
  to 
  be 
  in 
  error 
  when 
  he 
  ascribes 
  the 
  authorship 
  of 
  this 
  article 
  to 
  

   M. 
  Petit 
  

  

  