﻿new 
  Genera 
  of 
  Starfishes. 
  91 
  

  

  bb. 
  Papulse 
  extending 
  only 
  one-seventh 
  length 
  

  

  of 
  ray 
  ; 
  mouth-plates 
  with 
  comparatively 
  

  

  few 
  (5 
  or 
  6) 
  marginal 
  spines, 
  regularly 
  

  

  graduated 
  in 
  length 
  toward 
  inner 
  teeth 
  

  

  (fig. 
  2) 
  ; 
  dorsal 
  muscle-bands 
  stout 
  and 
  

  

  conspicuous 
  Myonotus, 
  gen. 
  nov. 
  

  

  act. 
  Abactinal 
  plates 
  flat 
  or 
  convex, 
  not 
  tabu- 
  

   late, 
  and 
  though 
  frequently 
  lobed 
  on 
  papu- 
  

   lars 
  areas, 
  not 
  strongly 
  so, 
  bearing 
  a 
  central 
  

   spine 
  only, 
  or 
  several 
  spinelets 
  in 
  addition, 
  

   or 
  one 
  to 
  several 
  small 
  spinelets 
  ; 
  supero- 
  

   marginals 
  usually 
  with 
  only 
  one 
  large 
  

   spine, 
  and 
  inferomarginals 
  with 
  one 
  or 
  two 
  

   primary 
  spines; 
  odd 
  interradial 
  marginal 
  

   prominent 
  and 
  usually 
  present 
  in 
  all 
  inter- 
  

   radii 
  Benthopecten, 
  Verrill. 
  

  

  Nearchastek, 
  gen. 
  nov. 
  

  

  Benthopectinidae 
  with 
  the 
  odd 
  interradial 
  marginal 
  plate 
  

   lacking 
  in 
  from 
  one 
  to 
  four 
  interradii, 
  though 
  sometimes 
  

   present 
  in 
  all 
  ; 
  not 
  always 
  present 
  in 
  both 
  series 
  of 
  the 
  same 
  

   interradius 
  ; 
  abactinal 
  plates 
  large 
  and 
  small 
  intermingled, 
  

   the 
  larger 
  primary 
  plates 
  bearing 
  on 
  a 
  low 
  tabulum 
  a 
  long 
  

   sharp 
  spine 
  surrounded 
  by 
  a 
  circle 
  of 
  accessory 
  slender 
  

   spinules, 
  variable 
  as 
  to 
  number 
  and 
  length 
  — 
  sometimes 
  over 
  

   half 
  as 
  long 
  as 
  the 
  primary 
  spine 
  ; 
  secondary 
  plates 
  with 
  a 
  

   group 
  of 
  shorter 
  spinelets 
  ; 
  primary 
  plates 
  of 
  papular 
  areas 
  

   strongly 
  stellate 
  ; 
  papulae 
  not 
  in 
  circumscribed 
  areas, 
  but 
  

   distributed 
  all 
  over 
  disk 
  (except 
  sometimes 
  the 
  very 
  centre) 
  

   and 
  along 
  ray 
  from 
  one-third 
  to 
  three-fifths 
  its 
  length, 
  being 
  

   confined 
  to 
  either 
  side 
  of 
  the 
  paxillar 
  area 
  distally 
  ; 
  rays 
  

   very 
  long 
  and 
  slender 
  ; 
  marginals 
  extremely 
  spiny 
  — 
  2 
  or 
  

   3 
  long 
  sharp 
  superomarginal 
  spines 
  and 
  2 
  to 
  5 
  infero- 
  

   marginals 
  ; 
  subambulacral 
  spines 
  1 
  to 
  3, 
  usually 
  2, 
  long 
  ; 
  

   furrow-spines 
  1 
  to 
  7 
  ; 
  mouth-plates 
  large, 
  with 
  numerous 
  

   marginal 
  spines, 
  those 
  of 
  each 
  pair 
  of 
  plates 
  disposed 
  in 
  three 
  

   independent 
  series 
  ; 
  the 
  median 
  teeth 
  which 
  are 
  the 
  largest 
  

   and 
  fewest, 
  and 
  on 
  either 
  side 
  a 
  series 
  of 
  8 
  to 
  12 
  smaller 
  

   spines, 
  subequal 
  or 
  graduated 
  in 
  length 
  toward 
  the 
  mesial 
  

   members 
  of 
  the 
  group 
  ; 
  pedicellarise 
  when 
  present 
  large, 
  

   pectinate, 
  on 
  any 
  or 
  all 
  of 
  the 
  following 
  plates 
  : 
  abactinals, 
  

   inferomarginals, 
  actinal 
  intermediates 
  ; 
  dorsal 
  muscle-bands 
  

   not 
  attached 
  to 
  an 
  ambulacral 
  ossicle, 
  rather 
  weak. 
  

  

  Type, 
  Acantharchaster 
  aciculosus^ 
  Fisher, 
  1910. 
  

  

  Myonotus, 
  gen. 
  nov. 
  

  

  Benthopectinidaj 
  similar 
  to 
  Nea?'chaster, 
  but 
  differing 
  in 
  

   having 
  the 
  papula? 
  confined 
  to 
  the 
  disk 
  and 
  proximal 
  seventh 
  

  

  