﻿LITTLE-K3T0WX 
  jtjkassic 
  ceixoids. 
  35 
  

  

  basals 
  are 
  " 
  toujours 
  pourvues 
  a 
  leur 
  angle 
  lateral 
  superieur, 
  ou 
  d'un 
  

   pore 
  tres 
  marque, 
  ou 
  d'une 
  petite 
  piece 
  ronde 
  ou 
  irreguliere 
  ; 
  angle 
  

   superieur 
  plus 
  ou 
  moins 
  ouvert 
  suivant 
  les 
  individus, 
  ou 
  meme 
  sur 
  

   les 
  pieces 
  d'un 
  meme 
  sommet, 
  partie 
  inferieure 
  droite 
  ou 
  arquee, 
  

   partie 
  laterale 
  echancree 
  par 
  le 
  pore 
  ou 
  la 
  petite 
  piece." 
  

  

  Many 
  specimens, 
  it 
  is 
  true, 
  have 
  a 
  deepish 
  pit 
  in 
  the 
  middle 
  of 
  

   the 
  lower 
  edge 
  of 
  each 
  radial 
  (PL 
  I. 
  fig. 
  17) 
  ; 
  but 
  this 
  is 
  fre- 
  

   quently 
  absent 
  altogether 
  (fig. 
  4 
  6), 
  and 
  when 
  present 
  certainly 
  

   does 
  not 
  lead 
  into 
  the 
  interior 
  of 
  the 
  calyx. 
  It 
  is 
  not 
  unfrequently 
  

   occupied 
  by 
  a 
  small 
  plate 
  or 
  tubercle, 
  which 
  may 
  or 
  may 
  not 
  be 
  in 
  

   contact 
  below 
  with 
  one 
  of 
  the 
  accessory 
  basal 
  pieces 
  (fig. 
  13) 
  . 
  In 
  

   none 
  of 
  the 
  specimens 
  that 
  I 
  have 
  seen 
  has 
  this 
  plate 
  any 
  central 
  

   pit, 
  such 
  as 
  was 
  described 
  by 
  Miller 
  and 
  Jelly. 
  I 
  can 
  form 
  no 
  idea 
  as 
  

   to 
  the 
  meaning 
  of 
  these 
  accessory 
  plates 
  : 
  they 
  are 
  evidently 
  

   without 
  any 
  morphological 
  importance, 
  or 
  they 
  would 
  be 
  more 
  con- 
  

   stant 
  in 
  their 
  occurrence. 
  

  

  3. 
  TheRadials. 
  

  

  As 
  in 
  the 
  other 
  Neocrinoidea 
  there 
  are 
  usually 
  three 
  radials 
  in 
  

   31. 
  Prattii, 
  the 
  last 
  of 
  which 
  is 
  an 
  axillary. 
  But 
  in 
  two 
  specimens 
  

   in 
  the 
  Walton 
  collection 
  the 
  number 
  is 
  increased 
  to 
  four. 
  In 
  one 
  

   case 
  the 
  lowest 
  of 
  the 
  four 
  is 
  much 
  smaller 
  than 
  the 
  other 
  first 
  

   radials 
  ; 
  but 
  in 
  the 
  individual 
  which 
  has 
  two 
  rays 
  of 
  four 
  joints 
  

   each, 
  the 
  two 
  lowest, 
  or 
  first 
  and 
  second 
  radials, 
  are 
  of 
  the 
  usual 
  

   size, 
  and 
  a 
  short 
  but 
  wide 
  joint 
  is 
  intercalated 
  beneath 
  each 
  of 
  the 
  

   axillaries 
  (fig. 
  23). 
  

  

  The 
  general 
  aspect 
  of 
  the 
  calyx 
  when 
  viewed 
  either 
  from 
  the 
  side 
  

   or 
  from 
  above 
  (PI. 
  I. 
  figs. 
  11, 
  17, 
  20, 
  21), 
  is 
  exceedingly 
  penta- 
  

   crinoid, 
  the 
  articular 
  faces 
  of 
  the 
  radials 
  sloping 
  more 
  steeply 
  and 
  

   being 
  better 
  developed 
  than 
  they 
  are 
  in 
  most 
  species 
  of 
  Millericrinus. 
  

   They 
  are 
  trapezoidal 
  in 
  shape, 
  somewhat 
  wider 
  than 
  high, 
  and 
  

   crossed, 
  rather 
  below 
  the 
  middle, 
  by 
  a 
  strong 
  articular 
  ridge. 
  

   Immediately 
  beneath 
  the 
  centre 
  of 
  this 
  ridge, 
  which 
  expands 
  con- 
  

   siderably 
  around 
  the 
  opening 
  of 
  the 
  axial 
  canal, 
  is 
  a 
  deep 
  pit 
  for 
  the 
  

   insertion 
  of 
  the 
  dorsal 
  elastic 
  ligament. 
  The 
  muscle-plates 
  are 
  large 
  

   and 
  well 
  marked, 
  and 
  are 
  separated 
  by 
  a 
  rather 
  wide 
  notch 
  ; 
  they 
  

   are 
  bounded 
  below 
  by 
  slight 
  horizontal 
  ridges 
  which 
  divide 
  the 
  

   muscular 
  fossa? 
  from 
  those 
  for 
  the 
  insertion 
  of 
  the 
  interarticular 
  

   ligaments. 
  

  

  The 
  distal 
  faces 
  of 
  the 
  second 
  radials 
  are 
  very 
  different 
  from 
  those 
  

   of 
  the 
  first, 
  as 
  is 
  the 
  case 
  in 
  most 
  of 
  the 
  JNeocrinoidea. 
  The 
  union 
  

   between 
  them 
  and 
  their 
  successors 
  is 
  effected 
  merely 
  by 
  ligaments, 
  

   without 
  the 
  intervention 
  of 
  the 
  muscles 
  which 
  take 
  part 
  in 
  most 
  of 
  

   the 
  articulations 
  between 
  the 
  successive 
  arm-joints. 
  There 
  is 
  a 
  

   strong 
  articular 
  ridge 
  (PL 
  I. 
  fig. 
  15) 
  which 
  is 
  pierced 
  by 
  the 
  

   opening 
  of 
  the 
  central 
  canal, 
  and 
  decreases 
  in 
  width 
  from 
  above 
  

   downwards. 
  On 
  either 
  side 
  of 
  it 
  is 
  a 
  deep 
  fossa 
  which 
  lodged 
  the 
  

   interarticular 
  ligament. 
  There 
  was 
  therefore 
  no 
  possibility 
  of 
  any 
  

   thing 
  but 
  a 
  lateral 
  movement 
  between 
  these 
  two 
  joints. 
  The 
  pecu- 
  

  

  d2 
  

  

  