﻿

  NEW 
  VORK 
  BTATB 
  mi 
  si:i 
  m 
  

  

  gulation 
  probably 
  exaggerated 
  by 
  lateral 
  compreeafen). 
  Growth 
  

   lines 
  obliquely 
  pennaitelj 
  apranged, 
  turning 
  subparallel 
  to 
  the 
  

   margin 
  In 
  the 
  flat 
  marginal 
  border. 
  A 
  faint 
  depression 
  and 
  pidge 
  

   running 
  parallel 
  to 
  the 
  keel 
  are 
  observable 
  on 
  either 
  wing. 
  The 
  

   longitudinal 
  rows 
  of 
  pustules 
  are 
  very 
  prominent, 
  wherever 
  the 
  

   shell 
  Is 
  exfoliated. 
  

  

  While 
  this 
  valve, 
  in 
  its 
  long, 
  lanceolate 
  form 
  and 
  long, 
  oblique 
  

   ba 
  * 
  aJ 
  I,l:,: 
  reminds 
  one 
  of 
  the 
  carina 
  of 
  Scalpellum, 
  

  

  it 
  la.ks 
  the 
  angles, 
  separating 
  the 
  tectum 
  from 
  the 
  parietes 
  and 
  

   intraparietes, 
  which 
  are 
  characteristic 
  features 
  of 
  that 
  genus. 
  

   The 
  possibility 
  thai 
  this 
  valve 
  could 
  be 
  a 
  laterally 
  compressed 
  

   and 
  extenuated 
  tergum 
  Is 
  excluded 
  by 
  its 
  symmetric 
  form. 
  

  

  3 
  Bostrum. 
  Small, 
  thick-shelled, 
  symmetric, 
  forming 
  two 
  

  

  sides 
  of 
  a 
  tetrahedron; 
  apex 
  incurved 
  (flattened 
  in 
  the 
  figured 
  

  

  cimen 
  by 
  compression, 
  as 
  indicated 
  by 
  a 
  break); 
  keel 
  strongly 
  

  

  elevated, 
  angular, 
  broad; 
  surface 
  with 
  strong 
  unequal 
  growth 
  

  

  lines 
  running 
  parallel 
  to 
  the 
  basal 
  margin. 
  ' 
  

  

  This 
  valve 
  hears 
  a 
  strong 
  resemblance 
  to 
  the 
  rostrum 
  of 
  Pol- 
  

   I 
  i 
  cip 
  e 
  8 
  c 
  a 
  r 
  i 
  n 
  a 
  t 
  u 
  s, 
  which, 
  however, 
  has 
  a 
  flat-topped 
  keel. 
  

   1 
  CTflper 
  lattts. 
  Small, 
  little 
  convex, 
  six-faced, 
  eight-sided, 
  

   thick-shelled; 
  two 
  middle 
  faces 
  forming 
  a 
  High, 
  basally 
  widening 
  

   keelj 
  ...her 
  faces 
  neatly 
  flal 
  ; 
  surface 
  with 
  fine, 
  concentric 
  growth 
  

   lines; 
  }>vn- 
  l{ 
  \. 
  concentric 
  undulations, 
  crossed 
  by 
  fine 
  radial 
  striae, 
  

   on 
  the 
  two 
  extreme 
  faces 
  and 
  along 
  the 
  basal 
  margin. 
  

  

  This 
  valve 
  has 
  been 
  termed 
  an 
  upper 
  latus 
  on 
  account 
  of 
  its 
  

   similarity 
  to 
  the 
  upper 
  latera 
  of 
  Scalpellum 
  quadratum 
  

   and 
  8c. 
  fossula. 
  The 
  general 
  form 
  of 
  this 
  valve 
  is 
  very 
  

   ,11,,,h 
  Kk:e 
  that 
  of 
  some 
  of 
  the 
  problematic 
  Pterot 
  hecas 
  de- 
  

   Bcribed 
  by 
  Ball 
  from 
  the 
  Trenton, 
  and 
  by 
  Barrande 
  from 
  the 
  

   ,: 
  " 
  , 
  "" 
  ,i;m 
  silmi 
  '- 
  ** 
  onv 
  specimen 
  however, 
  agrees 
  in 
  the 
  

   nature 
  of 
  its 
  shell 
  with 
  thevalvesof 
  Pollicipes 
  with 
  which 
  

   ^" 
  l;,h 
  " 
  1 
  ; 
  " 
  M| 
  can 
  be 
  referred 
  toe 
  pari 
  of 
  the 
  capitulum 
  of 
  

   thia 
  " 
  "• 
  u 
  Beems 
  a. 
  present 
  more 
  profitable 
  to 
  unite 
  it 
  

  

  Wlth 
  tbe 
  ,attep 
  than 
  t0 
  compare 
  i1 
  with 
  the 
  still 
  entirely 
  problema- 
  

   tic 
  P 
  ; 
  e 
  ro 
  t 
  h 
  e 
  <• 
  a 
  . 
  

  

  