﻿A. 
  E. 
  Verrill 
  — 
  Echinoderms 
  of 
  Northeastern 
  America. 
  203 
  

  

  LOPHOPTEE 
  ASTER 
  ABYSSORUM, 
  Sp. 
  130V. 
  

  

  Form 
  stellate, 
  with 
  five 
  short 
  rajs. 
  Eadii 
  42 
  and 
  22 
  mm 
  . 
  

   Disk 
  large 
  and 
  swollen 
  dorsally, 
  covered 
  with 
  definite, 
  angular 
  

   areolations, 
  due 
  to 
  the 
  outer 
  circle 
  of 
  paxillary 
  spinules 
  being 
  

   longer 
  than 
  the 
  others; 
  many 
  of 
  the 
  shorter 
  ones 
  project 
  

   slightly 
  above 
  the 
  cuticle 
  within 
  the 
  areolae 
  ; 
  the 
  central 
  spi- 
  

   nules 
  is 
  scarcely 
  larger 
  than 
  the 
  rest. 
  Muscular 
  fibers 
  feeble, 
  

   radiating. 
  Papulae 
  small 
  and 
  rather 
  numerous. 
  In 
  each 
  inter- 
  

   radial 
  area 
  there 
  is 
  a 
  furrow, 
  bordered 
  by 
  divergent, 
  webbed 
  

   groups 
  of 
  spinules 
  ; 
  no 
  definite 
  openings 
  are 
  visible 
  in 
  them, 
  

   except 
  some 
  pores 
  rather 
  larger 
  than 
  usual. 
  The 
  slender, 
  

   glassy, 
  actinal 
  radial 
  spines, 
  covered 
  with 
  thin 
  membrane, 
  

   project 
  as 
  a 
  fringe 
  at 
  the 
  margin. 
  Adambulacral 
  spines 
  

   slender, 
  five 
  to 
  seven, 
  webbed 
  for 
  about 
  half 
  their 
  length, 
  and 
  

   bordered 
  with 
  web 
  to 
  the 
  tips. 
  Yalve 
  of 
  the 
  segmental 
  pores 
  

   semi-oval, 
  attached 
  by 
  the 
  entire 
  adoral 
  margin 
  and 
  supported 
  

   by 
  a 
  short, 
  central 
  spinule. 
  

  

  B. 
  range, 
  2021 
  fath. 
  Two 
  specimens 
  (8141) 
  from 
  station 
  

   2226, 
  in 
  2021 
  fathoms, 
  K 
  lat. 
  37°, 
  W. 
  long, 
  71° 
  54/. 
  

  

  !No 
  allied 
  species 
  is 
  known. 
  

  

  Dorsally 
  this 
  species 
  resembles 
  Pter 
  aster 
  jpidvillus, 
  for 
  

   which 
  it 
  was 
  mistaken 
  at 
  first. 
  

  

  Hymenaster 
  modestus 
  Verrill. 
  

  

  Hymenoster 
  modestus 
  Verrill, 
  this 
  Journal, 
  vol. 
  xxix, 
  p. 
  151, 
  1885; 
  Proc. 
  Nat. 
  

   Mus., 
  vol 
  xvii, 
  p. 
  271, 
  1894. 
  

  

  B. 
  range, 
  1098 
  to 
  1451 
  fath. 
  Yery 
  rare. 
  Taken 
  at 
  two 
  

   stations, 
  K 
  lat. 
  39° 
  40' 
  05 
  v 
  and 
  39° 
  22 
  v 
  20". 
  

  

  Hymexaster 
  regalis, 
  sp. 
  nov. 
  

  

  Form 
  stellate 
  with 
  five 
  rays. 
  Greater 
  radii, 
  70 
  mm 
  ; 
  lesser, 
  

   45 
  mm 
  . 
  Disk 
  somewhat 
  swollen, 
  with 
  the 
  interradial 
  areas 
  

   sunken 
  ; 
  rays 
  broad, 
  somewhat 
  swollen, 
  broadest 
  a 
  little 
  beyond 
  

   the 
  base, 
  regularly 
  tapered. 
  The 
  entire 
  dorsal 
  surface 
  is 
  

   covered 
  with 
  long, 
  prominent, 
  sharp 
  spines, 
  which 
  project 
  far 
  

   beyond 
  the 
  super-dorsal 
  membrane, 
  but 
  are 
  covered 
  with 
  cuti- 
  

   cle 
  to 
  the 
  tip; 
  these 
  spines 
  form 
  nine 
  regular, 
  longitudinal 
  

   rows 
  on 
  each 
  ray 
  ; 
  those 
  in 
  the 
  two 
  rows 
  on 
  each 
  side 
  of 
  the 
  

   rays 
  are 
  united 
  by 
  a 
  web 
  extending 
  about 
  a 
  third 
  of 
  their 
  

   height. 
  About 
  ten 
  clusters 
  of 
  similar 
  spines 
  surround 
  the 
  

   central 
  area 
  of 
  the 
  disk, 
  which 
  is 
  covered 
  by 
  five, 
  broad, 
  concave, 
  

   valve-like 
  structures, 
  which 
  close 
  the 
  central 
  pore. 
  These 
  

   valves 
  are 
  supported 
  by 
  numerous 
  slender 
  spines, 
  which 
  pro- 
  

   ject 
  along 
  their 
  inner 
  margins, 
  and 
  several 
  stouter 
  spines 
  on 
  

   the 
  distal 
  margin, 
  all 
  of 
  which 
  are 
  webbed 
  together. 
  Each 
  

  

  