﻿132 
  A. 
  E. 
  Verrill 
  — 
  Echinoderms 
  of 
  Northeastern 
  America. 
  

  

  B. 
  range, 
  85 
  to 
  1608 
  fath. 
  Most 
  common 
  between 
  150 
  and 
  

   500 
  fath. 
  Taken 
  at 
  33 
  stations 
  between 
  K 
  lat. 
  44° 
  26' 
  and 
  

   37° 
  59' 
  30". 
  

  

  This 
  species 
  is 
  very 
  closely 
  allied 
  to 
  P. 
  discus 
  Sladen, 
  from 
  

   off 
  the 
  west 
  coast 
  of 
  S. 
  America 
  in 
  147 
  fath., 
  and 
  to 
  P. 
  tesselr 
  

   latus 
  SI., 
  from 
  the 
  Cape 
  of 
  Good 
  Hope. 
  

  

  Variety, 
  insignis 
  no 
  v. 
  

  

  A 
  few 
  specimens, 
  much 
  larger 
  than 
  usual 
  and 
  with 
  coarser 
  

   granules, 
  represent 
  a 
  marked 
  variety 
  or 
  perhaps 
  a 
  distinct 
  

   species. 
  For 
  the 
  present 
  it 
  may 
  be 
  best 
  to 
  consider 
  it 
  a 
  

   variety. 
  

  

  Eadii, 
  75 
  mm 
  and 
  23 
  Dara 
  . 
  Upper 
  surface 
  and 
  marginal 
  plates 
  

   granulated 
  nearly 
  as 
  in 
  the 
  typical 
  form, 
  except 
  that 
  the 
  gran- 
  

   ules 
  are 
  somewhat 
  larger. 
  Actinal 
  plates 
  covered 
  with 
  une- 
  

   qual, 
  coarse, 
  irregular, 
  angular, 
  fusiform 
  granules, 
  some 
  of 
  

   those 
  on 
  the 
  middle 
  of 
  each 
  plate 
  longer 
  and 
  larger, 
  spiniform. 
  

   Lower 
  marginal 
  plates 
  with 
  a 
  median 
  row 
  of 
  small, 
  appressed, 
  

   fusiform 
  spines 
  much 
  larger 
  than 
  the 
  granules. 
  Adambulacral 
  

   spines 
  longer 
  and 
  larger 
  than 
  in 
  the 
  type-form, 
  those 
  on 
  the 
  

   ventral 
  side 
  of 
  the 
  plates, 
  12-16 
  ; 
  the 
  largest, 
  thick 
  and 
  blunt, 
  

   or 
  clavate. 
  Jaw-spines 
  thick, 
  blunt, 
  angular, 
  longer 
  and 
  more 
  

   prominent 
  than 
  in 
  the 
  type, 
  those 
  on 
  the 
  actinal 
  surface 
  in 
  two 
  

   regular 
  rows 
  of 
  about 
  8 
  each. 
  

  

  B. 
  range, 
  100 
  to 
  1356 
  fath. 
  Nova 
  Scotia 
  to 
  K 
  lat. 
  40° 
  09' 
  30". 
  

  

  PSEUDABCHASTER 
  CONCINNUS 
  Verrill. 
  

  

  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  xvii, 
  p. 
  250, 
  1894. 
  

  

  B. 
  range, 
  1188 
  to 
  1791 
  fath. 
  In 
  one 
  instance 
  recorded 
  as 
  

   from 
  123 
  fathoms, 
  but 
  probably 
  erroneously. 
  Taken 
  at 
  3 
  sta- 
  

   tions 
  between 
  K 
  lat. 
  41° 
  28' 
  30" 
  and 
  41° 
  07'. 
  

  

  Family 
  Porcellanasterid^: 
  Sladen. 
  

  

  Ctenodiscus 
  crispatus 
  Dub. 
  and 
  Koren. 
  

  

  Asterias 
  crispatus 
  Retzius, 
  Dissert. 
  Asteriarum, 
  p. 
  IT, 
  1805. 
  

   Ctenodiscus 
  polaris 
  Mull, 
  and 
  Trosch., 
  Syst., 
  p. 
  16, 
  pi. 
  5, 
  fig. 
  5, 
  1842. 
  

   Ctenodiscus 
  crispatus 
  Duben 
  and 
  Kor., 
  K. 
  Vet. 
  Akad. 
  Handl, 
  p. 
  253, 
  1844; 
  

  

  Stimpson, 
  Invert. 
  G. 
  Manan, 
  p. 
  15, 
  1853; 
  Liiiken, 
  Gronl. 
  Echinod., 
  p. 
  45, 
  

  

  1857 
  ; 
  Verrill, 
  Proc. 
  Boat. 
  Soc. 
  Nat. 
  Hist, 
  vol. 
  x, 
  p. 
  345, 
  1866. 
  

   Ctenodiscus 
  corniculatus 
  Perrier, 
  Stell. 
  du 
  Mus., 
  p. 
  380, 
  1875; 
  Duncan 
  and 
  

  

  Sladen, 
  Echinod. 
  Arctic 
  Sea, 
  p. 
  49, 
  pi. 
  3, 
  figs. 
  17-20, 
  1881; 
  Sladen, 
  Voy. 
  

  

  Chall., 
  p. 
  171, 
  1889.* 
  

  

  B. 
  range, 
  5 
  to 
  632 
  fath. 
  Most 
  abundant 
  from 
  50 
  to 
  150 
  fath. 
  

   Taken 
  at 
  numerous 
  stations 
  in 
  Massachusetts 
  Bay, 
  Gulf 
  of 
  

   Maine, 
  Bay 
  of 
  Fundy, 
  etc. 
  It 
  extends 
  to 
  Greenland, 
  Spitz- 
  

   bergen, 
  and 
  Northern 
  Europe. 
  Circumpolar. 
  Allied 
  species 
  

   occur 
  in 
  the 
  South 
  Atlantic 
  and 
  South 
  Pacific. 
  

  

  * 
  This 
  is 
  an 
  instance 
  in 
  which 
  certain 
  writers 
  have 
  resurrected 
  Linck's 
  ante- 
  

   binomial 
  names 
  to 
  displace 
  those 
  given 
  under 
  the 
  Linnsean 
  system. 
  In 
  this 
  I 
  

   cannot 
  concur. 
  

  

  