﻿432 
  Panama 
  Shells. 
  auriculid^. 
  

  

  AURICUIiA. 
  — 
  Eight 
  species 
  of 
  this 
  genus 
  were 
  found, 
  

   and 
  two 
  of 
  these 
  occurred 
  abundantly 
  ; 
  but 
  we 
  have 
  been 
  

   able 
  to 
  determine 
  only 
  two 
  of 
  the 
  less 
  common 
  species. 
  The 
  

   number 
  of 
  known 
  species 
  in 
  the 
  genus 
  is 
  very 
  considerable, 
  yet 
  

   very 
  few 
  appear 
  to 
  be 
  known 
  which 
  belong 
  to 
  the 
  same 
  zoolo- 
  

   gical 
  province 
  in 
  which 
  Panama 
  is 
  situated. 
  Two 
  rather 
  large 
  

   species 
  were 
  collected 
  by 
  Mr. 
  Cuming 
  in 
  West 
  Columbia, 
  and 
  

   were 
  described 
  by 
  M. 
  Petit 
  in 
  the 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  1842. 
  

  

  309. 
  Auricula 
  acuta. 
  

  

  Synonymy. 
  

  

  Auricula 
  acuta 
  Orb. 
  in 
  Guerin 
  Mag. 
  Zool. 
  p. 
  23. 
  1835. 
  

  

  Orb. 
  Voy. 
  Amer. 
  Merid. 
  Moll. 
  p. 
  326. 
  pi. 
  42. 
  

  

  f. 
  4-6. 
  - 
  1846. 
  

  

  Marinula 
  Recluziana 
  Cuming 
  in 
  sched. 
  1852. 
  

  

  Station. 
  — 
  Near 
  brackish 
  water 
  ; 
  M. 
  Fontaine 
  ! 
  Orbigny. 
  

   Under 
  stones 
  near 
  high 
  water 
  mark. 
  

  

  Habitat. 
  — 
  Near 
  Guayaquil 
  ; 
  M. 
  Fontaine 
  ! 
  Orbigny. 
  

  

  West 
  Columbia 
  ; 
  Cuming 
  ! 
  in 
  sched. 
  

  

  Panama 
  : 
  C. 
  B. 
  A. 
  ! 
  

   Only 
  1 
  mature 
  and 
  2 
  young 
  specimens 
  were 
  obtained. 
  

  

  310. 
  Auricula 
  concinna. 
  Nov. 
  sp. 
  

  

  Shell 
  ellipsoidal 
  : 
  blackish 
  brown, 
  paler 
  on 
  the 
  convexity 
  of 
  

   the 
  last 
  whorl, 
  with 
  a 
  yellowish 
  white 
  spiral 
  band 
  on 
  the 
  last 
  

   whorl 
  issuing 
  from 
  beneath 
  the 
  suture 
  ; 
  with 
  the 
  plaits 
  and 
  

   callus 
  in 
  the 
  aperture 
  white 
  : 
  smooth 
  and 
  shining 
  : 
  apex 
  acute 
  : 
  

   spire 
  with 
  the 
  outlines 
  very 
  curvilinear 
  : 
  whorls 
  five, 
  convex, 
  

   imbricately 
  appressed, 
  with 
  the 
  suture 
  moderately 
  impressed 
  ; 
  

   last 
  whorl 
  long 
  : 
  aperture 
  narrow 
  and 
  very 
  acute 
  above, 
  much 
  

   contracted 
  by 
  the 
  plaits 
  : 
  labrum 
  sharp, 
  in 
  the 
  lower 
  part 
  much 
  

   thickened 
  within 
  by 
  a 
  broad 
  thick 
  deposit 
  : 
  plaits 
  three, 
  of 
  which 
  

   the 
  lower 
  one 
  is 
  very 
  oblique, 
  and 
  the 
  upper 
  one 
  is 
  very 
  large, 
  

  

  