﻿424 
  Panama 
  Shells. 
  NERITID^. 
  

  

  Family— 
  TOKNATELLIDJE. 
  

  

  293. 
  Pyraiiiidella. 
  Sp. 
  indet. 
  

  

  A 
  snow 
  white 
  shell, 
  of 
  which 
  1 
  specimen 
  was 
  found 
  near 
  

   Panama. 
  It 
  is 
  probably 
  a 
  young 
  shell, 
  having 
  only 
  eight 
  

   whorls. 
  

  

  294. 
  Pyraiiiidella 
  conica. 
  Nov. 
  sp. 
  

  

  Shell 
  long, 
  regularly 
  conic 
  : 
  white 
  on 
  the 
  upper 
  whorls, 
  dark 
  

   brown 
  on 
  the 
  others, 
  with 
  a 
  pale 
  spiral 
  line 
  just 
  above 
  the 
  

   suture 
  : 
  surface 
  smooth 
  and 
  shining 
  : 
  apex 
  very 
  acute 
  : 
  spire 
  

   with 
  the 
  outlines 
  rectilinear: 
  whorls 
  fourteen, 
  flat, 
  with 
  the 
  

   suture 
  in 
  a 
  narrow 
  deep 
  groove 
  : 
  last 
  whorl 
  sharply 
  angulated 
  

   at 
  the 
  periphery 
  : 
  aperture 
  oblique 
  : 
  labrum 
  thin 
  : 
  columella 
  

   with 
  three 
  plaits, 
  of 
  which 
  the 
  one 
  is 
  lamelliform, 
  and 
  the 
  other 
  

   two 
  are 
  very 
  small. 
  

  

  Mean 
  divergence, 
  about 
  23° 
  ; 
  length 
  .52 
  inch 
  ; 
  breadth 
  .175 
  

   inch 
  ; 
  length 
  of 
  spire 
  .38 
  inch. 
  

  

  This 
  species 
  is 
  remarkable 
  for 
  the 
  exact 
  conical 
  form 
  of 
  the 
  

   spire. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

   1 
  specimen 
  was 
  found. 
  

  

  Family— 
  NERITID^. 
  

  

  UTATICA. 
  — 
  We 
  are 
  deterred 
  from 
  the 
  description 
  of 
  any 
  

   indeterminate 
  species 
  in 
  this 
  genus, 
  because 
  several 
  species, 
  

   which 
  belong 
  to 
  the 
  same 
  zoological 
  province, 
  are 
  known 
  to 
  us 
  

   only 
  by 
  brief 
  descriptions. 
  Even 
  the 
  species 
  which 
  was 
  

   obtained 
  most 
  plentifully, 
  we 
  have 
  not 
  been 
  able 
  to 
  determine 
  . 
  

   yet 
  from 
  its 
  abundance, 
  it 
  must 
  be 
  well 
  known. 
  Monographs 
  

   of 
  Natica 
  and 
  Nerita 
  are 
  now 
  greatly 
  to 
  be 
  desired. 
  

  

  The 
  success 
  with 
  which 
  M. 
  Recluz 
  has 
  devoted 
  himself 
  to 
  

   this 
  and 
  to 
  the 
  allied 
  genera 
  is 
  well 
  known. 
  By 
  the 
  thorough 
  

  

  