﻿196 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Bythograptus 
  laxus 
  comes 
  from 
  the 
  Trenton 
  limestone 
  

   of 
  Platteville, 
  Wis. 
  The 
  same 
  locahty 
  has 
  furnished 
  a 
  small 
  num- 
  

   ber 
  of 
  other 
  forms 
  of 
  vegetable 
  aspect, 
  which 
  are 
  also 
  described 
  on 
  

   good 
  ground 
  as 
  marine 
  algae 
  in 
  the 
  same 
  publication. 
  

  

  In 
  a 
  later 
  paper^ 
  Professor 
  Whitfield 
  created 
  a 
  new 
  genus 
  

   Palaeodictyota, 
  for 
  a 
  form 
  from 
  the 
  Niagaran 
  of 
  New 
  York 
  before 
  

   described 
  as 
  a 
  graptolite 
  (Inocaulis 
  anastomotica 
  Ringue- 
  

   berg) 
  believing 
  the 
  same 
  to 
  be 
  a 
  marine 
  alga. 
  The 
  present 
  writer 
  

   has 
  lately 
  [N. 
  Y. 
  State 
  Mus. 
  Mem. 
  11. 
  1908. 
  p. 
  20] 
  shown 
  that 
  

   Palaeodictyota 
  has 
  the 
  tubular 
  composition 
  and 
  the 
  cell 
  apertures 
  of 
  

   a 
  graptolite 
  of 
  the 
  order 
  Dendroidea. 
  

  

  These 
  facts 
  serve 
  to 
  show 
  that 
  there 
  is 
  a 
  group 
  of 
  graptolites 
  

   that 
  in 
  their 
  habitus 
  approach 
  so 
  much 
  that 
  of 
  the 
  seaweeds 
  that 
  

   since 
  the 
  time 
  when 
  Goeppert 
  referred 
  Dictyonema 
  to 
  the 
  fucoids 
  

   announcing 
  the 
  discovery 
  of 
  a 
  fructification 
  (cystocarp) 
  like 
  that 
  

   of 
  Callithamnion 
  on 
  its 
  branches, 
  botanists 
  have 
  still 
  thought 
  it 
  

   possible 
  they 
  might 
  be 
  plant 
  remains, 
  and 
  Dictyonema 
  is 
  still 
  cited 
  

   in 
  the 
  great 
  standard 
  systematic 
  work, 
  Engler-Prantl's 
  " 
  Die 
  natiir- 
  

   lichen 
  Pflanzenfamilien 
  " 
  [i 
  Teil, 
  2. 
  Abt. 
  1897. 
  p. 
  554] 
  among 
  the 
  

   doubtful 
  seaweeds. 
  

  

  While 
  searching 
  for 
  graptolites 
  in 
  the 
  Trenton 
  limestone 
  of 
  

   Glens 
  Falls, 
  N. 
  Y., 
  the 
  writer 
  has 
  discovered 
  a 
  congeries 
  of 
  

   like 
  character 
  with 
  that 
  from 
  the 
  Trenton 
  group 
  of 
  Platteville, 
  

   Wis. 
  It 
  is 
  rather 
  with 
  the 
  intention 
  of 
  recording 
  the 
  occurrence 
  

   of 
  this 
  rare 
  group 
  of 
  fossils 
  in 
  the 
  eastern 
  Trenton 
  than 
  for 
  the 
  

   purpose 
  of 
  discussing 
  the 
  problem 
  of 
  the 
  vegetable 
  or 
  animal 
  

   character 
  of 
  these 
  fossils 
  that 
  this 
  note 
  is 
  published. 
  We 
  also 
  

   insert 
  for 
  this 
  reason 
  a 
  form 
  from 
  Glens 
  Falls 
  that 
  gives 
  fair 
  

   evidence 
  of 
  being 
  a 
  graptolite 
  of 
  the 
  order 
  Dendroidea 
  but 
  has 
  also 
  

   a 
  vegetable 
  appearance 
  and 
  is 
  associated 
  with 
  the 
  others, 
  and 
  we 
  

   desire 
  to 
  state 
  in 
  this 
  connection 
  our 
  belief 
  that 
  the 
  evidence 
  in 
  

   every 
  single 
  case 
  has 
  to 
  be 
  weighed 
  separately. 
  

  

  The 
  small 
  assemblage 
  of 
  Trenton 
  fossils 
  at 
  Glens 
  Falls 
  was 
  

   found 
  in 
  thin 
  patchy 
  seams 
  of 
  very 
  fine 
  grained 
  black 
  shale 
  inter- 
  

   calated 
  in 
  the 
  shaly 
  limestone 
  forming 
  the 
  hanging 
  wall 
  of 
  the 
  

   abandoned 
  '' 
  Black 
  marble 
  " 
  quarries 
  on 
  the 
  south 
  side 
  of 
  the 
  Hud- 
  

   son 
  river. 
  The 
  layer 
  containing 
  the 
  fossils 
  is 
  about 
  16 
  feet 
  above 
  

   the 
  base 
  of 
  the 
  Trenton. 
  

  

  Besides 
  the 
  algal 
  remains 
  the 
  bed 
  has 
  been 
  found 
  during 
  this 
  

   investigation 
  to 
  contain 
  also 
  small 
  fragments 
  of 
  true 
  graptolites 
  of 
  

  

  ^Bull. 
  Am. 
  Mus. 
  Nat. 
  Hist. 
  16, 
  art. 
  36, 
  p. 
  399 
  (1902). 
  

  

  