﻿42 
  P. 
  H. 
  CAEPENTEE 
  ON 
  SOME 
  NEW 
  OE 
  

  

  loviensis, 
  though 
  it 
  has 
  a 
  larger 
  centrodorsal, 
  more 
  numerous 
  cirrhi, 
  

   and 
  higher 
  articular 
  faces 
  on 
  the 
  first 
  radials, 
  so 
  that 
  it 
  is 
  clearly 
  

   an 
  Antedon. 
  In 
  their 
  general 
  fades, 
  however, 
  both 
  species 
  resemble 
  

   the 
  recent 
  Actinometrce 
  rather 
  than 
  the 
  majority 
  of 
  recent 
  Antedons. 
  

   The 
  same 
  difficulty 
  presents 
  itself 
  in 
  the 
  case 
  <3f 
  other 
  Jurassic 
  

   Comatulce, 
  which 
  are 
  very 
  synthetic 
  in 
  their 
  general 
  characters, 
  

   though 
  some 
  species 
  can 
  be 
  classified 
  without 
  difficulty. 
  Thus 
  Ant. 
  

   Greppini, 
  A. 
  decameros, 
  A. 
  Tessoni, 
  and 
  A. 
  scrobiculata 
  are 
  un- 
  

   mistakable 
  Antedons, 
  with 
  high 
  radials 
  and 
  a 
  large 
  centrodorsal 
  

   bearing 
  numerous 
  cirrhi 
  ; 
  and 
  Actinometra 
  ivurtembergica 
  is 
  a 
  true 
  

   Actinometra, 
  with 
  a 
  flattened 
  centrodorsal, 
  free 
  from 
  cirrhi 
  on 
  its 
  

   dorsal 
  surface, 
  and 
  a 
  wide 
  calyx-funnel. 
  Eut 
  such 
  forms 
  as 
  Ant. 
  

   Picteti, 
  de 
  Loriol, 
  and 
  Ant. 
  infracretacea, 
  de 
  Loriol, 
  with 
  their 
  low 
  

   wide 
  radials 
  and 
  flattened 
  centrodorsal 
  imperfectly 
  covered 
  with 
  

   cirrhi, 
  approach 
  very 
  closely 
  to 
  the 
  Actinometra-ty^e 
  ; 
  they 
  retain, 
  

   however, 
  the 
  sloping 
  articular 
  faces 
  which 
  are 
  so 
  characteristic 
  of 
  

   Antedon, 
  and 
  must 
  therefore 
  be 
  referred 
  to 
  that 
  genus. 
  

  

  Besides 
  their 
  tendency 
  to 
  combine 
  the 
  characters 
  of 
  recent 
  generic 
  

   types, 
  the 
  Jurassic 
  Comatulce 
  are 
  remarkable 
  for 
  their 
  large 
  size, 
  as 
  

   are 
  also 
  the 
  Cretaceous 
  species. 
  The 
  centrodorsal 
  may 
  reach 
  from 
  

   9-13 
  mm. 
  in 
  diameter, 
  which 
  is 
  greater 
  than 
  that 
  of 
  nearly 
  every 
  

   recent 
  species 
  except 
  Ant. 
  Eschrichtii 
  ; 
  while 
  this 
  type 
  and 
  Actino- 
  

   metra 
  robusta 
  are 
  almost 
  the 
  only 
  living 
  Comatulce 
  with 
  arm-bases 
  

   any 
  thing 
  like 
  so 
  massive 
  as 
  those 
  of 
  the 
  fossil 
  species. 
  Taken 
  as 
  a 
  

   whole, 
  the 
  group 
  is 
  chiefly 
  confined 
  to 
  depths 
  of 
  less 
  than 
  200 
  

   fathoms, 
  and 
  the 
  larger 
  specimens 
  inhabit 
  quite 
  shallow 
  water, 
  

   30 
  fathoms 
  or 
  less 
  ; 
  so 
  that 
  Ant. 
  calloviensis 
  and 
  Ant. 
  latiradia 
  must 
  

   have 
  lived 
  not 
  far 
  from 
  the 
  shores 
  of 
  the 
  Jurassic 
  seas. 
  

  

  Postscetpt. 
  

  

  Since 
  revising 
  the 
  proof 
  of 
  the 
  preceding 
  pages 
  I 
  have 
  been 
  

   favoured 
  by 
  Mons. 
  Moriere 
  with 
  a 
  copy 
  of 
  his 
  paper 
  on 
  " 
  Deux 
  

   Genres 
  de 
  Crinoi'des 
  de 
  la 
  Grande 
  Oolithe," 
  which 
  appeared 
  in 
  the 
  

   ' 
  Bulletin 
  de 
  la 
  Societe 
  Linneenne 
  de 
  Normandie,' 
  ser. 
  3, 
  vol. 
  v. 
  

   He 
  describes 
  the 
  discovery 
  of 
  a 
  Millericrinus 
  in 
  the 
  upper 
  part 
  of 
  the 
  

   Great 
  Oolite 
  at 
  Aunou-le-Faucon, 
  a 
  village 
  4 
  kilometres 
  from 
  Caen 
  ; 
  

   and 
  he 
  gives 
  a 
  photographic 
  representation 
  of 
  a 
  remarkable 
  slab 
  

   containing 
  five 
  specimens 
  of 
  Apiocrinus 
  Parhinsoni 
  and 
  three 
  of 
  the 
  

   Millericrinus. 
  These 
  last 
  he 
  identifies 
  with 
  M. 
  obconicus, 
  d'Orbigny, 
  

   or, 
  more 
  correctly, 
  M. 
  Prattii. 
  The 
  arms 
  of 
  one 
  specimen 
  are 
  pre- 
  

   served 
  to 
  a 
  length 
  of 
  about 
  60 
  millim., 
  and 
  the 
  length 
  of 
  its 
  stem 
  is 
  

   still 
  greater 
  ; 
  but 
  there 
  is 
  no 
  trace 
  of 
  a 
  root, 
  its 
  lowest 
  portion 
  having 
  

   been 
  broken 
  away. 
  

  

  According 
  to 
  M. 
  Moriere, 
  "II 
  ne 
  reste 
  plus 
  a, 
  trouver 
  aujourd'hui 
  

   que 
  la 
  racine 
  de 
  ce 
  Crinoi'de." 
  I 
  am 
  inclined 
  to 
  doubt, 
  however, 
  

   whether 
  there 
  is 
  really 
  any 
  root 
  for 
  us 
  to 
  discover. 
  

  

  

  