﻿AURICULA. 
  Panama 
  Shells. 
  433 
  

  

  concave 
  on 
  the 
  lower 
  side, 
  and 
  on 
  the 
  upper 
  side 
  extended 
  

   to 
  the 
  summit 
  of 
  the 
  aperture 
  with 
  a 
  transversely 
  ridged 
  

  

  Mean 
  divergence 
  about 
  80° 
  ; 
  length 
  .32 
  inch 
  ; 
  breadth 
  .2 
  

   inch 
  ; 
  length 
  of 
  spire 
  .09 
  inch. 
  

  

  Station.— 
  Om 
  specimens 
  were 
  found 
  mostly 
  on 
  the 
  short 
  

   suckers, 
  which 
  were 
  growing 
  up 
  thickly 
  beneath 
  the 
  mangroves, 
  

   near 
  high 
  water 
  mark. 
  

  

  Habitat.— 
  Fanama, 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  We 
  collected 
  74 
  specimens 
  two 
  and 
  one-half 
  miles 
  east 
  of 
  

  

  Panama. 
  

  

  311. 
  Auric 
  wla 
  mfrequens. 
  Nov. 
  sp. 
  

  

  Shell 
  ellipsoidal 
  : 
  brown, 
  with 
  a 
  pale 
  ill-defined 
  spiral 
  band 
  a 
  

   little 
  below 
  the 
  suture 
  : 
  with 
  fine 
  stri» 
  of 
  growth 
  : 
  apex 
  acute 
  : 
  

   spire 
  with 
  the 
  outlines 
  moderately 
  curvilinear 
  : 
  whorls 
  six, 
  

   obtusely 
  shouldered, 
  with 
  a 
  deep 
  suture 
  ; 
  last 
  whorl 
  compressed 
  : 
  

   aperture 
  subelliptical, 
  rather 
  wide 
  : 
  labrum 
  very 
  thin 
  : 
  with 
  two 
  

   plates, 
  of 
  which 
  one 
  is 
  at 
  the 
  anterior 
  part 
  of 
  the 
  aperture 
  and 
  

   is 
  oblique, 
  and 
  the 
  other 
  is 
  transverse 
  and 
  is 
  at 
  the 
  middle. 
  

  

  Mean 
  divergence 
  about 
  80° 
  ; 
  length 
  .23 
  inch 
  ; 
  breadth 
  .15 
  

   inch 
  ; 
  length 
  of 
  spire 
  .1 
  inch. 
  

  

  Station.— 
  JJnder 
  stones, 
  near 
  High 
  water 
  mark. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  0. 
  B. 
  A. 
  ! 
  

  

  We 
  collected 
  6 
  specimens, 
  in 
  company 
  with 
  Pedipes 
  angulata, 
  

   at 
  the 
  base 
  of 
  the 
  sea 
  wall 
  of 
  Panama. 
  

  

  312. 
  Auricula 
  Paiiamensis. 
  Nov. 
  sp. 
  

  

  Shell 
  long 
  ovate 
  : 
  blackish 
  red 
  throughout 
  except 
  that 
  the 
  

   plaits 
  are 
  white: 
  smooth 
  and 
  shining, 
  with 
  a 
  few 
  microscopic 
  

   spiral 
  stria? 
  near 
  the 
  apex: 
  apex 
  acute: 
  spire 
  with 
  the 
  outlines 
  

   very 
  curvihnear 
  over 
  the 
  middle 
  whorls, 
  and 
  nearly 
  rectilmear 
  

   on 
  the 
  lower 
  whorls 
  : 
  whorls 
  eight, 
  convex, 
  imbricately 
  appressed 
  ; 
  

  

  