﻿210 
  A. 
  E. 
  Yerrill 
  — 
  Echinoderms 
  of 
  Northeastern 
  America. 
  

  

  areas 
  S. 
  of 
  Rhode 
  Island 
  and 
  Martha's 
  Vineyard, 
  in 
  20 
  to 
  50 
  

   fath. 
  Allied 
  to 
  L. 
  hyperborea 
  (D. 
  and 
  Kor.) 
  of 
  arctic 
  Europe. 
  

  

  Leptasterias 
  tenera 
  Verrill. 
  

  

  Asterias 
  tenera 
  Stimpson, 
  Proc. 
  Boston 
  Soc. 
  Nat. 
  Hist., 
  vol. 
  viii, 
  p. 
  269, 
  1862 
  : 
  

  

  Yerrill, 
  op. 
  cit 
  , 
  vol. 
  x, 
  p. 
  349, 
  1866. 
  

   Asterias 
  (Leptasterias) 
  tenera 
  Verrill, 
  loc. 
  cit 
  , 
  pp. 
  349, 
  350. 
  

   Leptasterias 
  tenera 
  Verrill, 
  this 
  Journal, 
  vol. 
  vii, 
  p. 
  504, 
  1874 
  ; 
  Expl. 
  Casco 
  

  

  Bay, 
  in 
  Proc. 
  Amer. 
  Assoc. 
  Adv. 
  Sci. 
  for 
  1813, 
  p. 
  353, 
  1814 
  ; 
  Check 
  List, 
  

  

  p. 
  14, 
  1779. 
  

  

  B. 
  range, 
  10 
  to 
  129 
  fath. 
  Cape 
  Cod 
  to 
  Newfoundland. 
  

   Common 
  in 
  Massachusetts 
  Bay 
  and 
  the 
  Bay 
  of 
  Fundy, 
  in 
  10 
  to 
  

   40 
  fath. 
  This 
  is 
  very 
  closely 
  allied 
  to 
  L. 
  compta, 
  of 
  which 
  it 
  

   may 
  be 
  only 
  a 
  poorly 
  nourished, 
  slender 
  variety. 
  It 
  requires 
  

   more 
  careful 
  study 
  to 
  determine 
  this 
  question. 
  It 
  is 
  closely 
  

   allied 
  to 
  the 
  European 
  L. 
  Mulleri, 
  — 
  perhaps 
  the 
  same. 
  

  

  Leptasterias 
  Grcenlandica 
  Verrill. 
  

  

  Asteracanthion 
  Groenlandicus 
  Lutken, 
  Videns. 
  Meddel. 
  naturh. 
  Forening, 
  

  

  1857. 
  p. 
  29; 
  Duncan 
  and 
  Sladen, 
  op. 
  cit., 
  p. 
  27, 
  pi. 
  2, 
  figs. 
  9-12, 
  1881 
  (grcen- 
  

  

  landicum). 
  

   Asterias 
  Grcenlandica 
  Verrill, 
  Proc. 
  Boston 
  Soc. 
  Nat. 
  Hist., 
  vol. 
  x, 
  p. 
  357, 
  

  

  1866. 
  

   Leptasterias 
  Grcenlandica 
  Verrill, 
  Check 
  List, 
  p. 
  14, 
  1879. 
  

  

  B. 
  range, 
  5 
  to 
  100 
  fath. 
  Strictly 
  northern. 
  Taken 
  in 
  the 
  

   Bay 
  of 
  Fundy 
  and 
  Gulf 
  of 
  St. 
  Lawrence, 
  and 
  on 
  the 
  fishing 
  

   Banks 
  off 
  Nova 
  Scotia. 
  It 
  ranges 
  to 
  the 
  Arctic 
  Ocean 
  (N. 
  lat. 
  

   81° 
  41'). 
  

  

  Leptasterias 
  hispidella, 
  sp. 
  nov. 
  

  

  Rays 
  five, 
  rather 
  short 
  and 
  thick, 
  well 
  rounded, 
  tapered. 
  

   Radii 
  5 
  mm 
  and 
  27 
  mm 
  . 
  Abactinal 
  surface 
  covered 
  with 
  very 
  

   slender, 
  rather 
  long, 
  very 
  sharp 
  spines, 
  placed 
  singly, 
  and. 
  

   forming 
  three 
  pretty 
  regular 
  marginal 
  rows 
  on 
  each 
  side 
  and 
  a 
  

   rather 
  indistinct 
  median 
  row, 
  with 
  about 
  two 
  more 
  or 
  less 
  dis- 
  

   tinct 
  rows 
  between 
  the 
  median 
  and 
  supero-lateral 
  ; 
  the 
  marginal 
  

   spines 
  are 
  longest 
  ; 
  the 
  infero-marginal 
  spines 
  are 
  close 
  to 
  the 
  

   adambulacral, 
  and 
  sometimes 
  stand 
  two 
  on 
  a 
  plate 
  proximally 
  ; 
  

   a 
  few 
  single 
  papulae 
  usually 
  alternate 
  with 
  them 
  proximally. 
  

   Adambulacral 
  spines 
  long 
  and 
  slender, 
  divergent, 
  mostly 
  alter- 
  

   nately 
  one 
  and 
  two 
  to 
  a 
  plate. 
  Rectiform 
  or 
  major 
  pedicel- 
  

   lariae 
  of 
  actinal 
  surface 
  few, 
  rather 
  large, 
  long-ovate 
  or 
  lanceo- 
  

   late, 
  rather 
  acute, 
  with 
  sharp, 
  curved 
  denticles 
  at 
  the 
  tip 
  ; 
  

   smaller 
  ones 
  border 
  the 
  furrows, 
  within 
  ; 
  crossed 
  pedicellarise 
  

   form 
  small 
  clusters 
  on 
  the 
  dorsal 
  spines 
  and 
  larger 
  ones 
  on 
  the 
  

   laterals. 
  The 
  dorsal 
  plates 
  are 
  rather 
  slender, 
  with 
  large 
  inter- 
  

   spaces, 
  in 
  which 
  the 
  papulae 
  stand 
  singly, 
  or 
  two 
  or 
  three 
  

   together. 
  Madreporite 
  small, 
  with 
  few 
  coarse 
  short 
  gyri. 
  

  

  B. 
  range, 
  50 
  fath. 
  N. 
  lat. 
  45° 
  14' 
  30", 
  stat. 
  2494, 
  two 
  speci- 
  

   mens. 
  

  

  Allied 
  to 
  L. 
  littoralis^ 
  but 
  has 
  much 
  longer 
  and 
  very 
  acute 
  

   spines, 
  which 
  are 
  less 
  numerous. 
  

  

  