﻿900 
  FORTT-SEVENIH 
  REPORT 
  ON 
  THE 
  STATE 
  MutsEUM. 
  

  

  from 
  the 
  sides 
  of 
  the 
  tortuous 
  tubes, 
  all 
  of 
  which 
  cells 
  come 
  to 
  

   the 
  surface 
  in 
  a 
  direction 
  obliquely 
  upward 
  and 
  outward 
  to 
  the 
  

   plane 
  of 
  expansion. 
  The 
  tortuous 
  tubes 
  alternately 
  approximate 
  

   and 
  diverge, 
  so 
  as 
  to 
  give 
  place 
  to 
  quincuncial 
  oval 
  openings, 
  

   forming 
  a 
  part 
  of 
  the 
  fenestra) 
  es 
  which 
  have 
  their 
  origin 
  in 
  the 
  

   cellular 
  substance 
  of 
  the 
  sole/ 
  each 
  tortuous 
  tube 
  has 
  a 
  line 
  of 
  

   cell 
  pores 
  on 
  each 
  side, 
  which 
  find 
  their 
  way 
  through 
  the 
  fenes- 
  

   trules 
  to 
  surround 
  a 
  central 
  stylus 
  of 
  cell 
  pores, 
  which 
  seem 
  to 
  

   have 
  had 
  their 
  origin 
  in 
  the 
  cellular 
  tissue 
  of 
  the 
  sole 
  at 
  the 
  

   bottom 
  of 
  the 
  deep 
  fenestrates." 
  

  

  Mr. 
  Prout 
  misunderstood 
  the 
  character 
  of 
  the 
  specimen, 
  and 
  

   the 
  description 
  is 
  worthless. 
  It 
  is 
  only 
  when 
  we 
  see 
  the 
  illustra- 
  

   tions 
  that 
  we 
  can 
  form 
  any 
  idea 
  of 
  the 
  real 
  character 
  of 
  the 
  

   fossil 
  described. 
  

  

  Ulrich, 
  Geol. 
  111. 
  vol. 
  Till, 
  p. 
  555, 
  says: 
  

  

  " 
  On 
  account 
  of 
  certain 
  very 
  unfortunate 
  errors 
  in 
  Prout's 
  

   original 
  diagnosis 
  of 
  this 
  genus, 
  the 
  name 
  has 
  not 
  become 
  current. 
  

   His 
  type 
  specimen 
  was, 
  however, 
  almost 
  beyond 
  question, 
  a 
  

   fragment 
  of 
  a 
  large 
  and 
  easily 
  recognized 
  species 
  which 
  is 
  common 
  

   at 
  the 
  Falls 
  of 
  the 
  Ohio. 
  

  

  "He 
  mistook 
  the 
  obverse 
  for 
  the 
  reverse 
  side, 
  and 
  described 
  the 
  

   thin 
  membrane 
  which 
  is 
  often 
  drawn 
  over 
  the 
  summits 
  of 
  the 
  

   high 
  carinee, 
  as 
  a 
  longitudinally 
  lined 
  sole. 
  The 
  spaces 
  between 
  

   the 
  branches 
  and 
  this 
  membrane 
  is 
  filled 
  with 
  vesicular 
  tissue. 
  

   This 
  he 
  noticed 
  and 
  described, 
  together 
  with 
  the 
  true 
  zooecia, 
  

   which 
  he 
  called 
  ' 
  tortuous 
  tubes,' 
  as 
  a 
  part 
  of 
  the 
  ' 
  sole.' 
  

  

  " 
  The 
  cells, 
  he 
  supposed, 
  originated 
  in 
  the 
  tortuous 
  tubes 
  and 
  

   opened 
  into 
  the 
  fenestrules. 
  In 
  short 
  his 
  conception 
  of 
  S. 
  rhom 
  

   hoideum 
  was 
  altogether 
  incorrect. 
  

  

  " 
  The 
  genus 
  as 
  now 
  defined 
  departs 
  from 
  Fenestella 
  in 
  having 
  

   the 
  keel 
  very 
  much 
  higher 
  and 
  expanded 
  at 
  the 
  summit, 
  and 
  the 
  

   branches 
  zigzag 
  on 
  the 
  reverse. 
  The 
  zoarium 
  is 
  alwa} 
  r 
  s 
  infundi- 
  

   buliform, 
  with 
  the 
  inner 
  side 
  non-celluliferous. 
  

  

  " 
  Species 
  of 
  this 
  genus 
  can 
  be 
  recognized 
  in 
  the 
  Niagara 
  group, 
  

   but 
  it 
  is 
  not 
  until 
  we 
  reach 
  the 
  Upper 
  Helderberg 
  rocks 
  that 
  

   they 
  assume 
  their 
  most 
  marked 
  peculiarities 
  and 
  become 
  

   abundant. 
  

  

  