﻿ovuLA. 
  Panama 
  Shells. 
  255 
  

  

  specimens!, 
  of 
  which 
  three 
  arc 
  quite 
  perfect. 
  They 
  were 
  

   found 
  on 
  the 
  reef 
  at 
  Panama. 
  A 
  fragment 
  of 
  a 
  seventh 
  was 
  

   found 
  on 
  the 
  beach. 
  

  

  3. 
  Ovsila 
  ]\e£-Becla.— 
  ]Sro\ 
  

  

  sp. 
  

  

  Shell 
  rather 
  slender 
  : 
  dark 
  violaceous 
  red, 
  sometimes 
  with 
  

   as 
  light 
  tinge 
  of 
  brown; 
  paler 
  on 
  t:ielip: 
  smooth, 
  sometimes 
  

   with 
  microscopic 
  revolving 
  strias 
  : 
  aperture 
  very 
  narrow 
  in 
  the 
  

   posterior 
  three-fifths, 
  wider 
  anteriorly 
  ; 
  slightly 
  produced 
  at 
  

   both 
  extremities, 
  and 
  slightly 
  emarginate 
  anteriorly 
  : 
  lip 
  well 
  

   thickened, 
  nearly 
  straight 
  along 
  the 
  middle 
  : 
  columella 
  acu- 
  

   minate 
  at 
  both 
  extremities, 
  with 
  a 
  li)ngitudinal 
  impressed 
  line, 
  

   and 
  a 
  callus 
  behind 
  it. 
  Length, 
  .31 
  inch 
  ; 
  breadth, 
  .1 
  inch. 
  

  

  This 
  species 
  resembles 
  the 
  fig. 
  of 
  O. 
  rufa, 
  Sowb, 
  which 
  is 
  

   represented 
  as 
  much 
  larger, 
  with 
  a 
  broader 
  aperture. 
  

  

  Station. 
  — 
  With 
  O. 
  avena, 
  which 
  see. 
  

  

  Habitat. 
  — 
  Panama. 
  — 
  C. 
  B. 
  A. 
  ! 
  

  

  "VVe 
  collected 
  13 
  specimens 
  on 
  the 
  reef. 
  

  

  4. 
  Ovula. 
  Variafoilfis.— 
  Nov. 
  sp. 
  

  

  Shell 
  very 
  slender 
  : 
  usually 
  white, 
  with 
  a 
  slight 
  tinge 
  of 
  

   rufous, 
  with 
  the 
  lip 
  opaque 
  white; 
  sometimes 
  of 
  a 
  rich 
  red 
  

   purple: 
  smooth: 
  aperture 
  not 
  very 
  narrow, 
  a 
  liltlc 
  widened 
  

   anteriorly, 
  moderately 
  produced, 
  eftuse, 
  and 
  slightly 
  inflected 
  

   posteriorly; 
  obliquely 
  emarginate 
  anteriority 
  : 
  lip 
  well 
  thick- 
  

   ened 
  : 
  columella 
  with 
  a 
  longitudinal 
  keel, 
  acute 
  and 
  obliqunly 
  

   produced 
  anteriorly, 
  posteriorly 
  somewhat 
  biplicate. 
  Length, 
  

   .54 
  inch 
  ; 
  breadth, 
  .15 
  inches. 
  

  

  This 
  shell 
  resembles 
  O. 
  m_^pa:a, 
  Sowb., 
  but 
  is 
  more 
  slen- 
  

   der. 
  Perhaps 
  on 
  comparison 
  of 
  specimens, 
  they 
  may 
  be 
  proved 
  

   identical. 
  O. 
  uniplicata, 
  Sowb., 
  is 
  larger, 
  with 
  a 
  wider 
  aper- 
  

   ture. 
  

  

  