﻿AURICULA. 
  Panama 
  Shells. 
  435 
  

  

  Habitat. 
  — 
  Guayaquil 
  ; 
  M. 
  Fontaine 
  ! 
  Orbigny. 
  

   West 
  Columbia 
  ; 
  Cuming 
  ! 
  Kiister. 
  

   I, 
  of 
  Tumaca 
  ; 
  Cuming 
  ! 
  in 
  scbed. 
  

   Panama 
  ; 
  C. 
  B. 
  A, 
  ! 
  

  

  At 
  the 
  base 
  of 
  the 
  sea 
  wall 
  of 
  the 
  city 
  we 
  collected 
  36 
  speci- 
  

   mens 
  in 
  various 
  stages 
  of 
  growth. 
  They 
  are 
  rather 
  more 
  robust 
  

   than 
  the 
  species 
  is 
  represented 
  in 
  the 
  figures 
  above 
  cited. 
  

  

  314. 
  Auricula 
  Tabogcnsis. 
  Nov. 
  sp. 
  

  

  Shell 
  obovate 
  : 
  very 
  dark 
  brownish 
  red, 
  more 
  or 
  less 
  rufous 
  

   on 
  the 
  columella, 
  usually 
  white 
  on 
  the 
  plaits 
  and 
  callus 
  within 
  : 
  

   smooth 
  and 
  shining, 
  with 
  some 
  fine 
  spiral 
  striae 
  on 
  the 
  upper 
  

   whorls 
  : 
  apex 
  acute 
  : 
  spire 
  with 
  the 
  outlines 
  very 
  curvilinear 
  : 
  

   whorls 
  ten, 
  imbricately 
  appressed, 
  with 
  a 
  distinct 
  suture 
  : 
  last 
  

   whorl 
  large 
  : 
  aperture 
  long 
  and 
  narrow, 
  in 
  the 
  right 
  side 
  mostly 
  

   covered 
  by 
  a 
  transversely 
  ridged 
  callus 
  : 
  with 
  three 
  plaits 
  on 
  the 
  

   left 
  side, 
  of 
  which 
  the 
  upper 
  one 
  is 
  a 
  little 
  larger, 
  and 
  the 
  two 
  

   lower 
  are 
  separated 
  by 
  a 
  sinus. 
  

  

  Mean 
  divergence 
  about 
  100° 
  ; 
  length 
  .59 
  inch 
  ; 
  breadth 
  .36 
  

   inch 
  ; 
  length 
  of 
  spire 
  .15 
  inch. 
  

  

  Two 
  specimens 
  of 
  A. 
  fusca 
  Phil., 
  which 
  we 
  have 
  received 
  

   from 
  M. 
  Petit, 
  are 
  more 
  angular 
  in 
  the 
  upper 
  part 
  of 
  the 
  whorls, 
  

   and 
  have 
  the 
  callus 
  within 
  the 
  labrum 
  more 
  finely 
  and 
  closely 
  

   ridged. 
  A. 
  fu^ca, 
  as 
  figured 
  by 
  Kiister, 
  more 
  robust 
  and 
  less 
  

   pyriform 
  than 
  our 
  shell. 
  According 
  to 
  M. 
  Petit's 
  label, 
  A. 
  fusca 
  

   occurs 
  at 
  the 
  Marquesas, 
  and 
  Kiister 
  mentions 
  the 
  Sandwich 
  

   Islands 
  as 
  its 
  habitat. 
  In 
  outline 
  our 
  shell 
  resembles 
  A. 
  pyri- 
  

   formis 
  Petit 
  (West 
  Columbia, 
  Cuming 
  !), 
  but 
  within 
  the 
  aperture 
  

   there 
  is 
  no 
  resemblance. 
  

  

  Station. 
  — 
  On 
  and 
  under 
  stones 
  and 
  rocks 
  at 
  high 
  water 
  mark. 
  

  

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

   800 
  specimens 
  were 
  collected. 
  

  

  