﻿832 
  1\\T.T.m\Ti>] 
  IF 
  ILLT 
  

  

  normal 
  <1< 
  velopment 
  of 
  the 
  plat. 
  

  

  produce 
  Bueh 
  protuberancea 
  at 
  the 
  apical 
  end, 
  w 
  the 
  imbri- 
  

  

  eation 
  of 
  the 
  plates 
  is 
  downward 
  anil 
  would 
  not 
  permit 
  it. 
  Had 
  we 
  

   other 
  Bpeoimene 
  Bhowing 
  an 
  irregular 
  development 
  of 
  theambul 
  

  

  in 
  the 
  number 
  of 
  plates 
  towards 
  the 
  a] 
  

   end, 
  we 
  would 
  couple 
  this 
  feature 
  with 
  tin- 
  remarkably 
  devel< 
  

  

  i 
  refer 
  the 
  genus 
  to 
  a 
  new 
  and 
  distinct 
  family 
  under 
  the 
  

   name 
  of 
  Hybochinida. 
  At 
  pn 
  leave 
  it 
  in 
  a 
  family 
  wh< 
  

  

  Beeme 
  to 
  have 
  at 
  Least 
  Borne 
  affinity. 
  It 
  i- 
  quite 
  unni 
  

   pare 
  it 
  with 
  any 
  otlur 
  genus, 
  or 
  for 
  the 
  purposes 
  of 
  identification 
  

   to 
  continue 
  the 
  comparison 
  with 
  other 
  characters 
  | 
  i 
  by 
  

  

  LepidesU 
  

  

  lIvlioCllINlS 
  SI'KCl 
  W'.II.IS. 
  Sp. 
  Q 
  

  

  PI. 
  XXXI, 
  lit:. 
  •'> 
  ii.; 
  view 
  <>f 
  a 
  dopn 
  a 
  i\* 
  it 
  m 
  ; 
  

  

  of 
  four 
  ambulacra!, 
  and 
  throe 
  interambuli 
  

  

  end, 
  mac 
  i 
  

   of 
  the 
  scattering 
  spines 
  from 
  ti- 
  

  

  f 
  the 
  ambulacra! 
  or 
  other 
  plat< 
  

  

  ilk'- 
  •'•. 
  <L, 
  magnified 
  view 
  of 
  some 
  <>f 
  the 
  smbnla 
  

   Bnmmll 
  men 
  Bhowing 
  tl 
  . 
  »y 
  belong 
  

  

  a 
  kindred 
  

  

  General 
  form 
  Bubspheroidal, 
  modified, 
  hi 
  by 
  th< 
  

  

  flexibility 
  i>f 
  the 
  test, 
  and 
  as 
  it 
  appears, 
  in 
  thi 
  type, 
  al 
  I 
  

   end, 
  by 
  peculiar 
  protuberances, 
  one 
  of 
  which 
  project* 
  like 
  a 
  horn. 
  

   Ten 
  ranges 
  <>f 
  plates 
  may 
  be 
  oounted 
  in 
  an 
  ambulacra! 
  area 
  in 
  the 
  

   type 
  specimen, 
  but 
  this 
  number 
  may 
  be, 
  and 
  probably 
  

   in 
  the 
  equatorial 
  region, 
  for 
  ten 
  ranges 
  may 
  ho 
  distinguished 
  in 
  the 
  

   born-like 
  projection 
  from 
  one 
  of 
  them, 
  where 
  all 
  tl- 
  

   certainly 
  not 
  exposed. 
  The 
  ambulacra! 
  plates 
  imbricate 
  from 
  I 
  

   upward, 
  tnewhat 
  regularly 
  b< 
  

  

  ated, 
  in 
  tin- 
  central 
  part 
  of 
  which 
  then 
  

   ,\> 
  tin 
  plates 
  imbricate 
  upward 
  the 
  lower 
  pari 
  of 
  each 
  i- 
  

   B0 
  that, 
  in 
  fact, 
  the 
  pores 
  i 
  tipy 
  an 
  upper 
  central 
  position 
  in 
  

  

  plate, 
  p 
  at 
  the 
  lower 
  inner 
  

  

  one. 
  The 
  plates 
  are 
  -<» 
  bevi 
  to 
  form 
  ■ 
  smooth 
  exterior 
  fa 
  

  

  body. 
  The 
  infa 
  rambulaoral 
  little 
  more 
  than 
  

  

  half 
  as 
  wide 
  as 
  the 
  ambulacra] 
  areas, 
  and 
  

  

  imen, 
  at 
  a 
  point 
  above 
  th< 
  

   of 
  plati 
  . 
  I 
  be 
  ward 
  th« 
  

  

  the 
  plat 
  tlj 
  dimmish 
  n 
  

  

  I 
  and 
  from 
  the 
  c. 
  ntral 
  range 
  outward, 
  so 
  that 
  tin 
  -■the 
  

  

  