﻿92 
  

  

  On 
  two 
  new 
  Genera 
  of 
  Starfishes. 
  

  

  of 
  ray, 
  in 
  the 
  comparatively 
  few 
  marginal 
  mouth-spines, 
  

   regularly 
  graduated 
  in 
  length 
  toward 
  the 
  inner 
  teeth, 
  and 
  in 
  

   the 
  very 
  stout 
  dorsal 
  muscle-bands 
  ; 
  marginal 
  plates 
  very 
  

   spiny 
  (2 
  or 
  3 
  supermarginal 
  and 
  at 
  least 
  3 
  inferomarginal 
  

   spines) 
  ; 
  primary 
  abactinal 
  plates 
  of 
  papular 
  areas 
  strongly 
  

   lobed 
  and 
  in 
  the 
  form 
  of 
  tabulate 
  paxilla?, 
  bearing 
  a 
  large 
  

   central 
  spine, 
  and 
  a 
  circle 
  of 
  small 
  spinelets 
  on 
  the 
  tabulum 
  ; 
  

   odd 
  interradial 
  marginals 
  present 
  in 
  all 
  interradii, 
  the 
  unpaired 
  

   superomarginal 
  not 
  conspicuously 
  larger 
  than 
  neighbouring 
  

   plates, 
  and 
  its 
  spines 
  not 
  larger 
  than 
  succeeding 
  supero- 
  

   marginal 
  spines 
  ; 
  adambulacral 
  furrow-spines 
  1 
  to 
  3, 
  long 
  ; 
  

   subambulacral 
  spines 
  2. 
  

  

  Type, 
  Acanthar 
  -chaster 
  intermedins, 
  Fisher, 
  1910. 
  

  

  Fi-. 
  1. 
  

  

  Fisr. 
  3. 
  

  

  Fig. 
  5. 
  

  

  Fig. 
  1. 
  Mouth-plates 
  of 
  Nearchaster 
  aciculosus. 
  X 
  3. 
  

  

  2. 
  Mouth-plates 
  of 
  Mtjonotus 
  intermedins. 
  X 
  3. 
  

  

  3. 
  Seventh 
  superomarginal 
  plate 
  of 
  Nearchaster 
  aciculosus, 
  from 
  

  

  above. 
  X 
  3. 
  

  

  4. 
  Eighth 
  adambulacral 
  plate 
  of 
  Myonotus 
  intermedins 
  : 
  f, 
  furrow- 
  

  

  spines. 
  X 
  3. 
  

  

  5. 
  Abactinal 
  paxillse 
  of 
  Nearchaster 
  aciculosus. 
  x 
  3. 
  

  

  