﻿On 
  hvo 
  new 
  Genera 
  of 
  Starfishes. 
  89 
  

  

  eylindricus, 
  postice 
  leviter 
  arapliatus 
  ; 
  capite 
  toto 
  rugoso, 
  para- 
  

   bolico, 
  antice 
  vix 
  inciso 
  ; 
  pronoto 
  fortiter 
  sat 
  inaequaliter 
  punc- 
  

   tate), 
  postice 
  medio 
  locvigato, 
  lateribus 
  regulariter 
  arcuatis, 
  basi 
  

   laevissime 
  trisinuato, 
  angulis 
  posticis 
  rotundatis 
  ; 
  scutello 
  laevi 
  ; 
  

   elytris 
  grosse 
  haud 
  profunde 
  annulato-punctatis, 
  punctis 
  sub- 
  

   seriatis, 
  lateribus 
  lsevigatis, 
  apicibus 
  obsolete 
  punctatis, 
  stria 
  

   suturali 
  integra 
  profunde 
  impressa 
  ; 
  propygidii 
  medio 
  striis 
  stri- 
  

   dulatoriis 
  parum 
  dense 
  prsedito 
  ; 
  pygidii 
  lateribus 
  punctato- 
  

   rugosis 
  ; 
  mandibulis 
  extus 
  distincte 
  trilobatus 
  : 
  

  

  d 
  , 
  capite 
  breviter 
  acute 
  cornuto 
  ; 
  pronoto 
  profunde 
  longitudinaliter 
  

   excavato, 
  lateribus 
  utrinque 
  biacuminatis 
  ; 
  pygidio 
  politissimo 
  : 
  

  

  5 
  , 
  paulo 
  longiora, 
  capite 
  postice 
  leviter 
  angulatim 
  carinato 
  ; 
  pygidii 
  

   medio 
  subtiliter 
  punctato. 
  

  

  Long. 
  20-22-5 
  mm. 
  ; 
  lat. 
  max. 
  11-5-12-5 
  mm. 
  

  

  Hah. 
  Astove 
  T. 
  

  

  A 
  specimen 
  of 
  each 
  sex 
  was 
  taken 
  by 
  Mr. 
  P. 
  R. 
  Dupont 
  

   and 
  presented 
  by 
  him 
  to 
  the 
  Museum. 
  It 
  is 
  a 
  rather 
  small 
  

   species 
  of 
  a 
  dark 
  reddish 
  colour, 
  and 
  differs 
  most 
  markedly 
  

   from 
  its 
  allies 
  by 
  the 
  obsolete 
  hind 
  angles 
  of 
  the 
  prothorax. 
  

   The 
  thoracic 
  cavity 
  of 
  the 
  male 
  is 
  rather 
  narrow 
  but 
  deep, 
  

   and 
  extends 
  almost 
  to 
  the 
  hind 
  margin 
  of 
  the 
  pronotum. 
  

   The 
  punctures 
  of 
  the 
  elytra 
  are 
  large, 
  but 
  not 
  deep, 
  and 
  not 
  

   distinctly 
  arranged 
  in 
  rows. 
  

  

  VII. 
  — 
  Two 
  new 
  Genera 
  of 
  Starfishes. 
  

   By 
  Walter 
  K. 
  Fisher, 
  Stanford 
  University, 
  California. 
  

  

  The 
  new 
  genera 
  belong 
  to 
  the 
  Benthopectinidae, 
  their 
  

   position 
  being 
  somewhere 
  between 
  Benthopecten 
  and 
  Luidi- 
  

   aster 
  (Acantharchaster) 
  . 
  The 
  type 
  species 
  were 
  described 
  

   by 
  me 
  as 
  Acantharchaster 
  *, 
  because 
  the 
  abactinal 
  spino- 
  

   paxillse, 
  marginal 
  plates, 
  and 
  adambulacial 
  armature 
  show 
  a 
  

   great 
  similarity 
  to 
  those 
  of 
  Acantharchaster 
  dawsoni. 
  

  

  In 
  his 
  recent 
  account 
  of 
  the 
  Notomy 
  ta 
  f, 
  Ludwig 
  recognizes 
  

   eight 
  genera, 
  divided 
  among 
  two 
  families, 
  the 
  Cheirasteridae 
  

   (corresponding 
  to 
  Verrill's 
  Pontasterinas) 
  and 
  the 
  Bentho- 
  

   pectinidaa. 
  These 
  two 
  groups 
  are 
  equivalent 
  to 
  the 
  Bentho- 
  

   pectinidse 
  as 
  employed 
  by 
  me 
  in 
  1906 
  $. 
  The 
  new 
  genera 
  

  

  * 
  Zoologischer 
  Anzeiger, 
  Bd. 
  xxxv., 
  March 
  29, 
  1910, 
  pp. 
  549-551. 
  

   t 
  "Notomyota, 
  eine 
  neue 
  Ordnung 
  der 
  Seesterne," 
  Sitzungsb. 
  k. 
  preuss. 
  

   Akad. 
  d. 
  Wiss. 
  1910, 
  pp. 
  435-466. 
  

  

  \ 
  U.S. 
  Fish 
  Comm. 
  Bulletin 
  for 
  1903, 
  pt. 
  iii. 
  p. 
  1039. 
  

  

  