﻿458 
  Panama 
  Shells, 
  CALTPTRiEiD^. 
  

  

  4. 
  The 
  Caribbean 
  waters. 
  

  

  5. 
  West 
  side 
  of 
  America, 
  tropical 
  stores. 
  

  

  6. 
  " 
  " 
  " 
  southern 
  temperate 
  region. 
  

   It 
  is 
  also 
  common 
  in 
  a 
  fossil 
  state. 
  

  

  " 
  Fossile 
  en 
  Italic, 
  en 
  Sicilie, 
  en 
  Moree, 
  a 
  Bordeaux 
  et 
  a 
  Dax, 
  

   dans 
  les 
  faluns 
  de 
  la 
  Touraine 
  :" 
  Deshayes. 
  

  

  "Fossile 
  nel 
  Piacentine 
  e 
  nel 
  Sanese 
  ;" 
  Brocchi. 
  

  

  351. 
  Crepidula 
  niTea. 
  Nov. 
  sp. 
  

  

  Shell 
  ovate-elliptic 
  : 
  rather 
  thick 
  : 
  within 
  snow 
  white 
  : 
  with- 
  

   out 
  dingy 
  white, 
  sometimes 
  with 
  a 
  faint 
  tinge 
  of 
  brown 
  : 
  very 
  

   irregularly 
  concentrically 
  more 
  or 
  less 
  wrinkled, 
  with 
  very 
  dis- 
  

   tinct 
  strige 
  of 
  growth 
  : 
  apex 
  turned 
  more 
  or 
  less 
  to 
  the 
  right, 
  

   moderately 
  prominent, 
  marginal 
  : 
  septum 
  longitudinally 
  sub- 
  

   angular, 
  with 
  a 
  deep 
  sinus 
  at 
  the 
  left 
  and 
  a 
  shallow 
  one 
  at 
  the 
  

   right 
  : 
  margin 
  thick, 
  exhibiting 
  striae 
  of 
  growth. 
  It 
  closely 
  

   resembles 
  C. 
  unguiformis, 
  but 
  constantly 
  differs 
  ia 
  characters 
  

   and 
  station. 
  

  

  Length 
  1.4 
  inch 
  ; 
  breadth 
  1 
  inch 
  ; 
  height 
  .4 
  inch. 
  

  

  Station. 
  — 
  Under 
  stones, 
  near 
  low 
  water 
  mark. 
  

  

  Habitat 
  — 
  Panama 
  ; 
  C, 
  B. 
  A. 
  ! 
  

  

  45 
  specimens 
  were 
  collected 
  on 
  the 
  reef. 
  

  

  352. 
  Crepidula 
  o^culans. 
  Nov. 
  sp. 
  

  

  Shell 
  elliptical 
  : 
  pale 
  horn 
  color, 
  subtransparent 
  : 
  surface 
  

   minutely 
  decussated 
  with 
  numerous 
  very 
  small 
  radiating 
  and 
  

   concentric 
  ridges 
  : 
  apex 
  subterminal, 
  very 
  prominent, 
  not 
  

   marginal, 
  with 
  the 
  nuclear 
  portion 
  smooth, 
  shining, 
  transparent 
  

   and 
  slightly 
  directed 
  to 
  the 
  right 
  : 
  septum 
  but 
  little 
  above 
  the 
  

   margin, 
  extremely 
  narrow 
  or 
  linear, 
  extending 
  around 
  the 
  

   posterior 
  part 
  of 
  the 
  shell 
  : 
  margin 
  very 
  thin. 
  In 
  some 
  respects, 
  

   this 
  species 
  is 
  allied, 
  to 
  Pileopsis. 
  

  

  Length 
  .14 
  inch 
  ; 
  breadth 
  .1 
  inch 
  ; 
  height 
  .045 
  inch. 
  

  

  