﻿PLATE 
  IX. 
  

  

  Ibaccus 
  hrevipcs. 
  (p. 
  62). 
  

   Fig. 
  1. 
  Dorsal 
  aspect 
  of 
  the 
  animal, 
  male 
  ; 
  iiat. 
  size. 
  

   „ 
  ly. 
  Sec'ond 
  somite 
  of 
  pleoii. 
  

   „ 
  If/. 
  Second 
  pleopod. 
  

  

  Ibaccus 
  alticremitus 
  (p. 
  63). 
  

   ,, 
  2$. 
  Dorsal 
  view 
  of 
  a 
  female 
  ; 
  uat. 
  size. 
  

  

  Arctus 
  sordidus 
  (p. 
  66). 
  

  

  , 
  3. 
  Dorsal 
  view 
  of 
  a 
  f(miale 
  ; 
  nat. 
  size. 
  

  

  . 
  3". 
  One 
  side 
  of 
  the 
  ventral 
  as^jeet 
  of 
  pereion 
  ; 
  eidarged. 
  

  

  , 
  'Ml 
  <? 
  . 
  Second 
  pleopod 
  of 
  the 
  male. 
  

  

  , 
  3(7?. 
  Second 
  pleopod 
  of 
  the 
  female. 
  

  

  , 
  3?' 
  ^ 
  . 
  Third 
  pleopod 
  of 
  the 
  male. 
  

  

  , 
  3r?. 
  Tliird 
  pleopod 
  of 
  tlie 
  female. 
  

  

  Arctiis 
  orientally 
  (p. 
  68). 
  

   ,, 
  4. 
  Dorsal 
  view 
  of 
  the 
  female; 
  nat. 
  size. 
  

   ,, 
  A". 
  One 
  side 
  of 
  the 
  ventral 
  aspect 
  of 
  pereion 
  ; 
  enlarged. 
  

   „ 
  4o 
  <J 
  . 
  Extremity 
  of 
  posterior 
  perciopod 
  of 
  the 
  male. 
  

   „ 
  4o?. 
  Extremity 
  of 
  posterior 
  pereiopod 
  of 
  the 
  female. 
  

  

  