﻿136 
  A. 
  E. 
  Verrill 
  — 
  Echinoderms 
  of 
  Northeastern 
  America. 
  

  

  series 
  and 
  sixteen 
  in 
  the 
  ventral 
  series, 
  all 
  uniformly 
  covered 
  

   with 
  rather 
  coarse, 
  rounded 
  granules, 
  standing 
  a 
  little 
  apart, 
  the 
  

   margins 
  of 
  the 
  plates 
  with 
  a 
  regular 
  row 
  of 
  granules 
  of 
  about 
  

   the 
  same 
  size. 
  Abactinal 
  plates 
  flat, 
  mostly 
  rather 
  large, 
  

   rounded 
  or 
  hexagonal, 
  with 
  some 
  small, 
  rounded 
  ones 
  inter- 
  

   spersed 
  ; 
  all 
  are 
  uniformly 
  covered 
  with 
  rather 
  coarse, 
  spaced 
  

   granules, 
  like 
  those 
  of 
  the 
  marginal 
  plates, 
  so 
  that 
  the 
  whole 
  

   of 
  the 
  upper 
  surface 
  has 
  a 
  remarkably 
  uniform 
  granular 
  coat- 
  

   ing. 
  The 
  larger 
  plates 
  often 
  bear 
  fifty 
  to 
  seventy 
  granules 
  ; 
  

   the 
  small 
  intermediate 
  plates 
  frequently 
  carry 
  but 
  nine 
  to 
  

   twelve. 
  Actinal 
  plates 
  large, 
  rhombic, 
  uniformly 
  covered 
  with 
  

   coarse, 
  angular 
  granules, 
  distinctly 
  larger 
  than 
  those 
  of 
  the 
  mar- 
  

   ginal 
  plates. 
  Adambulacral 
  plates 
  numerous 
  and 
  crowded, 
  

   similar 
  to 
  the 
  actinal 
  plates, 
  but 
  slightly 
  larger 
  and 
  longer, 
  the 
  

   length 
  increasing 
  somewhat 
  toward 
  the 
  ends 
  of 
  the 
  rays. 
  Each 
  

   plate 
  usually 
  bears 
  three 
  or 
  four 
  marginal 
  spines 
  in 
  a 
  simple 
  

   row 
  ; 
  outside 
  of 
  these 
  there 
  are 
  usually 
  nine 
  to 
  twelve 
  thicker, 
  

   obtuse, 
  angular 
  spines, 
  forming 
  four 
  irregular, 
  longitudinal 
  

   rows, 
  the 
  outer 
  ones 
  smallest. 
  Jaws 
  covered 
  with 
  numerous 
  

   blunt, 
  angular 
  spines, 
  similar 
  to 
  the 
  actinal 
  spines, 
  but 
  larger. 
  

   One 
  specimen 
  (No. 
  13,362) 
  was 
  taken 
  at 
  station 
  1098. 
  

  

  Odontaster 
  hispidus 
  Verrill. 
  

  

  Odontaster 
  hispidus 
  Verrill, 
  this 
  Journal, 
  vol. 
  xx, 
  p. 
  402, 
  1880; 
  Proc. 
  Nat. 
  Mus., 
  

   vol. 
  xvii, 
  p. 
  263, 
  1894. 
  

  

  B. 
  range, 
  43 
  to 
  1230 
  fath. 
  Taken 
  at 
  many 
  stations 
  between 
  

   N. 
  lat. 
  44' 
  28° 
  30" 
  and 
  39° 
  53'. 
  

  

  No 
  very 
  closely 
  allied 
  sjDecies 
  is 
  known. 
  

  

  The 
  genus 
  Gnathaster 
  (Sladen, 
  1889) 
  appears 
  to 
  be 
  identi- 
  

   cal 
  with 
  this. 
  Among 
  the 
  recorded 
  species 
  are 
  the 
  following 
  : 
  

  

  Odontaster 
  pihdatus 
  (Gnathaster 
  SI.) 
  Magellan 
  St. 
  

  

  O. 
  elo?igatus 
  ( 
  Gnathaster 
  SI.) 
  Southern 
  Ocean. 
  

  

  O. 
  singularis 
  (Astrogonium 
  M. 
  and 
  Tr.) 
  W. 
  S. 
  America. 
  

  

  O. 
  miliaris 
  (Astrogonium 
  Gray) 
  N. 
  Zealand. 
  

  

  O. 
  paxillosum 
  (Astrogonium 
  Gray) 
  Australia. 
  

  

  O. 
  dilatatus 
  (Pentagonaster 
  Per.) 
  N. 
  Zealand. 
  

  

  O. 
  meridionalis 
  (Astrogonium 
  Smith) 
  Southern 
  Ocean. 
  

  

  O. 
  Grayi 
  (Calliderma 
  Bell) 
  Magellan 
  Str. 
  

  

  Isaster 
  Bairdti 
  Verrill. 
  

  

  Archaster 
  Bairdli 
  Verrill, 
  this 
  Journal, 
  vol. 
  xxiii, 
  p. 
  139, 
  1882. 
  

   Isaster 
  Bairdii 
  Verrill, 
  Proc. 
  Nat. 
  Mus., 
  vol. 
  xvii, 
  p. 
  258, 
  1894. 
  

  

  B. 
  range, 
  351 
  to 
  721 
  fath. 
  Taken 
  at 
  6 
  stations 
  between 
  E". 
  

   lat. 
  42° 
  55' 
  30" 
  and 
  39° 
  47' 
  07". 
  

  

  No 
  other 
  species 
  of 
  this 
  genus 
  is 
  known. 
  

  

  