﻿184 
  Twenty-eighth 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  ferent 
  stages 
  of 
  growth 
  of 
  the 
  animal, 
  which 
  in 
  its 
  young 
  

   state 
  is 
  parasitic, 
  becoming 
  free 
  above 
  and 
  rapidly 
  increasing 
  

   in 
  size 
  in 
  its 
  later 
  stages. 
  

  

  This 
  manifestation 
  of 
  development, 
  here 
  illustrated, 
  cor- 
  

   responds 
  in 
  all 
  respects 
  with 
  the 
  figures 
  given 
  by 
  Sir 
  R. 
  I. 
  

   Murchison 
  in 
  his 
  Silurian 
  System, 
  as 
  cited 
  in 
  a 
  previous 
  note, 
  

   except 
  that 
  we 
  do 
  not 
  possess 
  casts 
  of 
  the 
  interior, 
  which 
  are 
  

   there 
  illustrated 
  in 
  a 
  very 
  beautiful 
  manner. 
  Similar 
  casts 
  of 
  

   another 
  species 
  are 
  illustrated 
  on 
  plate 
  28, 
  figs. 
  12, 
  a. 
  c. 
  d. 
  e., 
  

   Pal. 
  N. 
  Y., 
  vol. 
  ii. 
  The 
  Waldron 
  specimens, 
  in 
  their 
  young 
  

   condition, 
  closely 
  resemble 
  those 
  from 
  Dudley 
  in 
  England, 
  

   as 
  they 
  occur 
  attached 
  to 
  the 
  shells 
  of 
  Pentamerus 
  and 
  

   Meristella. 
  

  

  The 
  similarity 
  of 
  Cornulites, 
  in 
  its 
  young 
  state, 
  with 
  Ten- 
  

   tactjlites, 
  has 
  led 
  to 
  the 
  reference 
  of 
  these 
  bodies 
  to 
  the 
  

   latter 
  genus, 
  and 
  in 
  some 
  of 
  their 
  phases 
  it 
  is 
  not 
  easy 
  to 
  

   make 
  the 
  distinction.* 
  The 
  Tentaculites 
  in 
  all 
  stages 
  of 
  

   growth, 
  so 
  far 
  as 
  we 
  know, 
  have 
  been 
  free 
  floating 
  shells 
  ; 
  but 
  

   Cornulites 
  is 
  always 
  parasitic 
  in 
  its 
  young 
  state 
  at 
  least, 
  and 
  

   may 
  either 
  become 
  free 
  or 
  remain 
  attached 
  throughout 
  its 
  

   existence. 
  Some 
  of 
  the 
  forms 
  heretofore 
  known 
  as 
  Tenta- 
  

   culites 
  in 
  rocks 
  of 
  the 
  Hudson 
  River 
  group 
  in 
  the 
  western 
  

   States, 
  and 
  possessing 
  all 
  the 
  external 
  characters 
  of 
  that 
  genus, 
  

   have 
  also 
  the 
  vesicular 
  texture 
  belonging 
  to 
  Cornulites 
  ; 
  

   and 
  a 
  more 
  critical 
  study 
  of 
  some 
  of 
  the 
  species 
  has 
  shown 
  

   them 
  to 
  be 
  parasitic 
  and 
  gregarious 
  in 
  their 
  earlier 
  stages 
  

   of 
  growth. 
  I 
  have 
  long 
  known 
  that 
  Tentaculites 
  flexuosus 
  

   (Pal. 
  IS". 
  Y., 
  vol. 
  i,) 
  is 
  a 
  Cornulites, 
  and 
  these 
  facts 
  have 
  in- 
  

   duced 
  me 
  to 
  review 
  some 
  other 
  species 
  published 
  as 
  Tentacu- 
  

   lites. 
  

  

  Tentaculites 
  flexuosus, 
  ut 
  cit. 
  will 
  therefore 
  be 
  placed 
  under 
  

   Cornulites 
  = 
  C. 
  flexuosus, 
  a 
  species 
  growing 
  singly 
  or 
  in 
  

   groups, 
  as 
  illustrated 
  in 
  the 
  original 
  figures, 
  Pal. 
  JV. 
  Z"., 
  vol. 
  

   i, 
  pi. 
  29, 
  and 
  of 
  which 
  we 
  know 
  nothing 
  regarding 
  its 
  later 
  

   stages, 
  corresponding 
  to 
  the 
  larger 
  growth 
  of 
  C. 
  proprius. 
  

  

  The 
  figure 
  described 
  in 
  the 
  same 
  volume, 
  page 
  284, 
  pi. 
  78, 
  is 
  

   apparently 
  a 
  distinct 
  species 
  ; 
  and 
  the 
  specimens 
  from 
  west- 
  

   ern 
  localities, 
  considered 
  identical 
  with 
  that 
  from 
  the 
  Hudson 
  

   river 
  group 
  of 
  New 
  York, 
  have 
  since 
  been 
  described 
  under 
  

   other 
  names. 
  

  

  The 
  form 
  described 
  as 
  Cornulites 
  flexuosus 
  (Pal. 
  N. 
  Y., 
  

   vol. 
  ii, 
  p. 
  98, 
  pi. 
  28,) 
  is 
  a 
  true 
  Cornulites, 
  the 
  specimen 
  12a 
  

   retaining 
  a 
  portion 
  of 
  the 
  test, 
  but 
  preserving 
  no 
  distinct 
  exter- 
  

   ior 
  annulations, 
  while 
  the 
  other 
  figures 
  are 
  casts 
  of 
  the 
  inter- 
  

   ior. 
  Since 
  the 
  specific 
  name 
  flexuosus 
  is 
  preoccupied, 
  I 
  pro- 
  

   pose 
  the 
  name 
  Cornulites 
  Clintoni. 
  

  

  * 
  See 
  illustrations 
  Pal. 
  N. 
  Y., 
  vol. 
  v, 
  part 
  ii, 
  plate 
  115. 
  

  

  