﻿132 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  smooth 
  surface; 
  branches 
  mostly 
  simple 
  from 
  the 
  base 
  13-14 
  cm 
  

   long. 
  

  

  Found 
  in 
  the 
  cement 
  beds 
  of 
  the 
  Waterlime, 
  Buffalo 
  (N. 
  Y.) 
  

   (Grote 
  & 
  Pitt) 
  

  

  Genus 
  arthrophycus 
  Hall 
  

   / 
  [Ety. 
  : 
  apOpov^ 
  a 
  joint; 
  (poxoq, 
  a 
  seaweed] 
  

  

  (1852. 
  Pal 
  N. 
  Y. 
  2:4) 
  

  

  Stems 
  simple 
  or 
  dividing 
  at 
  the 
  beginning 
  and 
  remaining 
  simple 
  

   thereafter 
  ; 
  rounded 
  or 
  subangular, 
  flexuous, 
  transversely 
  marked 
  by 
  

   ridges 
  or 
  articulations. 
  

  

  Arthrophycus 
  harlani 
  (Conrad) 
  (Plate 
  16) 
  (1852. 
  Pal. 
  N.Y, 
  

   2:5, 
  pi. 
  I 
  and 
  2) 
  

  

  Distinguishing 
  characters. 
  Strong, 
  rounded 
  articulated 
  stems, 
  di- 
  

   viding 
  near 
  the 
  base 
  into 
  numerous 
  elongated 
  branches; 
  simple, 
  

   flexible, 
  articulated 
  branches 
  which 
  diminish 
  in 
  size 
  very 
  gradually. 
  

  

  Found 
  on 
  the 
  under 
  side 
  of 
  certain 
  sandstone 
  beds 
  in 
  the 
  upper 
  

   part 
  of 
  the 
  Medina 
  in 
  the 
  Niagara 
  section. 
  

  

  Genus 
  nematophycus 
  Carruthers 
  

  

  [Ety. 
  : 
  vrip-a, 
  thread 
  ; 
  ^ 
  jxo? 
  , 
  seaweed] 
  

  

  (1872. 
  Month, 
  micro, 
  jour.) 
  

  

  Considered 
  a 
  gigantic 
  alga, 
  with 
  cyHndric 
  branching 
  stems, 
  and 
  a 
  

   peculiar 
  structure 
  which 
  led 
  Dawson 
  to 
  refer 
  it 
  to 
  the 
  Coniferae 
  

   under 
  the 
  name 
  Prototaxites. 
  What 
  resemble 
  concentric 
  

   rings 
  of 
  growth 
  and 
  medullary 
  rays 
  appear; 
  cells 
  irregular, 
  cylindric, 
  

   thick 
  walled. 
  The 
  specimens 
  are 
  generally 
  silicified. 
  

  

  Nematophycus 
  crassus 
  (Penhallow) 
  (1896. 
  Nematophyton 
  

   c 
  r 
  a 
  s 
  s 
  u 
  m 
  Penhallow. 
  Can. 
  record 
  of 
  science. 
  July 
  1896, 
  7:151-56, 
  

  

  pi. 
  2) 
  

  

  Distinguishing 
  characters. 
  Section 
  showing 
  numerous 
  irregular 
  

   round 
  or 
  oval 
  medullary 
  spots 
  ; 
  large 
  cells 
  in 
  groups, 
  thick 
  walled. 
  

  

  The 
  specimen 
  is 
  the 
  basal 
  portion 
  of 
  a 
  stock 
  showing 
  root 
  pro- 
  

   cesses; 
  length 
  56 
  cm, 
  diameter 
  at 
  upper 
  end 
  7.5 
  cm, 
  widening 
  

   toward 
  base 
  to 
  16.5 
  cm. 
  

  

  Found 
  in 
  the 
  Manlius 
  limestone 
  of 
  North 
  Buffalo. 
  (F. 
  K. 
  Mixer) 
  

  

  