﻿autO 
  UNUSUAL 
  FORMS 
  OF 
  FOSSIL 
  CRINOIPS 
  SPRINGER 
  55 
  

  

  and 
  afterwards 
  by 
  Meek 
  and 
  Worthen, 
  86 
  but 
  under 
  the 
  name 
  "Agas- 
  

   sizocrinus 
  daetyliformis 
  Troost," 
  as 
  of 
  a 
  " 
  specimen 
  perfect 
  in 
  all 
  

   its 
  parts," 
  along 
  with 
  another 
  figure 
  (7b) 
  said 
  to 
  be 
  "from 
  a 
  speci- 
  

   men 
  in 
  the 
  State 
  collection 
  " 
  ; 
  their 
  figure 
  was 
  in 
  turn 
  copied 
  under 
  

   the 
  same 
  name 
  by 
  S. 
  A. 
  Miller, 
  37 
  and 
  under 
  Koemer's 
  name 
  by 
  Zittel 
  

   in 
  the 
  Grundziige 
  (1895, 
  p. 
  137), 
  and 
  Zittel-Eastman 
  in 
  Text-book 
  

   of 
  Paleontology, 
  editions 
  of 
  1896 
  and 
  1913 
  (pp. 
  162 
  and 
  224) 
  ; 
  thus 
  

   it 
  was 
  given 
  a 
  wide 
  circulation 
  both 
  in 
  this 
  country 
  and 
  in 
  Europe. 
  

  

  Shumard's 
  description 
  and 
  figure 
  of 
  A. 
  daetyliformis 
  in 
  1854 
  

   were 
  made 
  from 
  an 
  imperfect 
  calyx, 
  consisting 
  only 
  of 
  the 
  fused 
  in- 
  

   frabasals 
  and 
  part 
  of 
  the 
  basals, 
  and 
  for 
  any 
  close 
  comparison 
  of 
  

   species 
  may 
  be 
  disregarded. 
  But 
  none 
  of 
  these 
  publications, 
  al- 
  

   though 
  all 
  using 
  Troost's 
  name, 
  brought 
  out 
  the 
  authentic 
  type 
  

   specimen 
  on 
  which 
  Troost 
  proposed 
  the 
  species, 
  which 
  was 
  not 
  done 
  

   until 
  1909, 
  when 
  his 
  monograph 
  was 
  published 
  by 
  the 
  U. 
  S. 
  National 
  

   Museum, 
  edited 
  by 
  Miss 
  Wood. 
  Hence 
  all 
  the 
  figures 
  based 
  on 
  the 
  

   Roemer 
  type, 
  either 
  the 
  original 
  or 
  copies, 
  must 
  be 
  called 
  A. 
  laevis; 
  

   and 
  Troost's 
  species, 
  A. 
  daetyliformis, 
  must 
  fall 
  under 
  it 
  as 
  a 
  

   synonym. 
  

  

  The 
  original 
  specimen 
  from 
  which 
  Roemer 
  , 
  s 
  figure 
  was 
  made 
  is 
  

   now 
  in 
  my 
  possession, 
  formerly 
  in 
  the 
  collection 
  of 
  B. 
  F. 
  Shumard, 
  

   and 
  I 
  am 
  giving 
  photographs 
  of 
  it 
  after 
  some 
  additional 
  preparation 
  

   (pi. 
  15, 
  figs. 
  5, 
  5a). 
  From 
  this 
  it 
  will 
  be 
  seen 
  that 
  while 
  restoring 
  

   the 
  lacking 
  parts 
  of 
  the 
  arms, 
  Roemer 
  missed 
  the 
  important 
  element 
  

   of 
  the 
  anal 
  plates, 
  which 
  were 
  not 
  shown 
  in 
  his 
  cast 
  because 
  con- 
  

   cealed 
  by 
  the 
  matrix. 
  

  

  In 
  order 
  to 
  have 
  an 
  authentic 
  starting 
  point, 
  I 
  am 
  also 
  figuring 
  

   the 
  type 
  specimen 
  of 
  Owen 
  and 
  Shumard's 
  genotype, 
  A. 
  conicus, 
  

   now 
  in 
  the 
  United 
  States 
  National 
  Museum 
  (pi. 
  15, 
  fig. 
  1). 
  In 
  ad- 
  

   dition 
  to 
  these, 
  I 
  have 
  prepared 
  a 
  number 
  of 
  figures 
  from 
  complete 
  

   calices 
  as 
  found 
  in 
  several 
  localities 
  throughout 
  the 
  region 
  in 
  which 
  

   the 
  genus 
  abounds, 
  among 
  which 
  may 
  be 
  identified 
  some 
  of 
  the 
  

   numerous 
  species 
  which 
  have 
  been 
  described, 
  based 
  upon 
  the 
  more 
  

   or 
  less 
  conical 
  or 
  globose 
  form 
  of 
  the 
  calyx 
  (pi. 
  15). 
  These 
  speci- 
  

   mens 
  are 
  also 
  important 
  in 
  connection 
  with 
  the 
  newly 
  discovered 
  

   leading 
  character 
  of 
  the 
  genus, 
  to 
  be 
  presently 
  explained. 
  

  

  Agassizocrinus 
  is 
  typically 
  a 
  late 
  Chester 
  form. 
  Its 
  earliest 
  ob- 
  

   served 
  occurrence 
  is 
  in 
  the 
  upper 
  Ohara, 
  or 
  Renault 
  formation 
  of 
  the 
  

   lower 
  Chester; 
  but 
  it 
  becomes 
  common 
  in 
  the 
  lower 
  Okaw 
  division 
  

   of 
  the 
  upper 
  Chester 
  under 
  its 
  local 
  appellations 
  of 
  Golconda, 
  Gas- 
  

   per, 
  etc., 
  and 
  what 
  is 
  known 
  as 
  the 
  Pentremites 
  godoni 
  bed. 
  It 
  con- 
  

   tinues 
  in 
  great 
  abundance 
  in 
  the 
  upper 
  Okaw, 
  Glen 
  Dean, 
  etc., 
  

  

  86 
  111., 
  vol. 
  5, 
  pi. 
  21, 
  fig. 
  la. 
  

  

  "North 
  Amer. 
  Geol. 
  and 
  Pal. 
  p. 
  221. 
  

  

  