﻿FISSURELLA. 
  Panama 
  Shells. 
  459 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  Only 
  1 
  specimen 
  of 
  this 
  extraordinary 
  species 
  was 
  obtained. 
  

  

  353. 
  Crepidula 
  rostrata. 
  Nov. 
  sp. 
  

  

  Shell 
  very 
  convex, 
  irregularly 
  elliptic 
  : 
  livid 
  brown, 
  some- 
  

   times 
  with 
  pale 
  ill-defined 
  spots 
  : 
  irregularly 
  somewhat 
  corru- 
  

   gated 
  both 
  radiately 
  and 
  concentrically 
  : 
  apex 
  very 
  acute 
  and 
  

   prominent, 
  rostriform, 
  very 
  distant 
  from 
  but 
  extending 
  beyond 
  

   the 
  posterior 
  margin, 
  slightly 
  directed 
  to 
  the 
  right 
  : 
  septum 
  far 
  

   within 
  the 
  margin, 
  planulate, 
  usually 
  very 
  oblique 
  to 
  the 
  plane 
  

   of 
  the 
  aperture 
  : 
  margin 
  thin, 
  irregular. 
  

  

  Length 
  .48 
  inch 
  ; 
  breadth 
  .3 
  inch 
  ; 
  height 
  .29 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  5 
  specimens 
  were 
  obtained 
  in 
  different 
  stages 
  of 
  growth. 
  

  

  Family— 
  FISSURELLID^. 
  

   354. 
  Fissurella 
  aBqiialis. 
  

  

  Synonymy. 
  

  

  Fissurella 
  cequalis 
  Sovvb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  127. 
  Nov. 
  1834. 
  

  

  Miill. 
  Synop. 
  Nov. 
  Test. 
  Viv. 
  p. 
  158. 
  May 
  1836. 
  

  

  Sowb. 
  Conch. 
  111. 
  No. 
  49. 
  pi. 
  76. 
  f. 
  56. 
  1841. 
  

  

  Reeve 
  Conch. 
  Icon. 
  pi. 
  8. 
  f. 
  55. 
  Dec. 
  1849, 
  

  

  Station. 
  — 
  On 
  dead 
  shells 
  in 
  from 
  6 
  to 
  10 
  fathoms 
  ; 
  Cuming 
  ! 
  

   Sowerby 
  : 
  also 
  Reeve. 
  

  

  Habitat. 
  — 
  St. 
  Elena; 
  Cuming! 
  Sowerby: 
  also 
  Reeve. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   6 
  specimens 
  were 
  obtained. 
  

  

  