﻿CRUSTACEA. 
  243 
  

  

  front 
  and 
  the 
  absence 
  of 
  the 
  woolly 
  patch 
  on 
  the 
  outer 
  surface 
  of 
  the 
  

   wrist. 
  

  

  Litocheira 
  hispmosa, 
  Kinahan, 
  from 
  Port 
  Phillip*, 
  which 
  in 
  many 
  

   of 
  its 
  characters 
  seems 
  to 
  be 
  allied 
  to 
  Pseudor-liombila 
  sulcatifrons, 
  is 
  

   at 
  once 
  distinguished 
  by 
  having 
  but 
  a 
  single 
  spine 
  behind 
  the 
  exterior 
  

   orbital 
  angle. 
  Specimens 
  are 
  in 
  the 
  Eritish-Museum 
  collection 
  from 
  

   Port 
  Curtis 
  {H.M.S. 
  ' 
  Herald 
  '). 
  Mr. 
  Haswell, 
  in 
  his 
  Catalogue, 
  

   omits 
  reference 
  to 
  this 
  species, 
  and 
  to 
  several 
  others 
  described 
  by 
  

   Kinahan. 
  

  

  The 
  species 
  described 
  by 
  Haswell 
  as 
  Eucrate 
  crfflnis 
  (Catalogue, 
  

   p. 
  86) 
  is, 
  I 
  think, 
  identical 
  with 
  typical 
  P. 
  sidcatifrons 
  (Stimpson). 
  

   The 
  type 
  was 
  from 
  Holborn 
  Island, 
  near 
  Port 
  Denison 
  (20 
  fms.). 
  

  

  I 
  have 
  quite 
  recently 
  described, 
  under 
  the 
  name 
  P. 
  sidcatifrons, 
  

   var. 
  atJanticaf, 
  a 
  specimen 
  from 
  Goree 
  Island, 
  Senegambia, 
  which 
  

   is 
  scarcely 
  distinguishable 
  from 
  Oriental 
  examples 
  of 
  this 
  species. 
  

  

  87. 
  Ceratoplax 
  arcuata. 
  (Plate 
  XXV, 
  fig. 
  B.) 
  

  

  Carapace 
  longitudinally 
  convex, 
  scarcely 
  broader 
  than 
  long 
  and 
  

   not 
  wider 
  behind 
  than 
  in 
  the 
  middle 
  ; 
  the 
  surface, 
  when 
  viewed 
  

   under 
  a 
  lens 
  of 
  sufScitut 
  power, 
  is 
  seen 
  to 
  be 
  covered 
  with 
  a 
  very 
  

   short 
  pubescence 
  ; 
  the 
  sides 
  are 
  anteriorly 
  arcuated, 
  posteriorly 
  

   parallel 
  : 
  the 
  antero-lateral 
  margins, 
  which 
  are 
  acute, 
  are 
  divided 
  by 
  

   three 
  slight 
  notches, 
  but 
  can 
  scarcely 
  be 
  described 
  as 
  dentated. 
  The 
  

   front 
  foims 
  with 
  the 
  antero-lateral 
  margins 
  a 
  continuous 
  curved 
  

   line 
  ; 
  it 
  is 
  somewhat 
  deflexed, 
  obscurely 
  sinuated 
  in 
  the 
  middle, 
  with 
  

   the 
  exterior 
  angles 
  rounded 
  off 
  and 
  not 
  prominent, 
  and 
  has 
  some 
  

   longer 
  hairs 
  on 
  its 
  upper 
  surface. 
  The 
  first 
  two 
  segments 
  of 
  the 
  

   postabdomcn 
  in 
  the 
  male 
  are 
  very 
  much 
  shorter 
  than 
  the 
  following, 
  

   almost 
  transversely 
  linear 
  in 
  shape; 
  the 
  first 
  segment, 
  although 
  

   laterally 
  produced, 
  does 
  not 
  reach 
  to 
  the 
  bases 
  of 
  the 
  fifth 
  ambulatory 
  

   legs. 
  The 
  eye-peduncles 
  fit 
  closely 
  into 
  the 
  orbits 
  (which 
  are 
  not 
  

   deep) 
  and 
  have 
  their 
  anterior 
  and 
  upper 
  margins 
  acute 
  and 
  clothed 
  

   with 
  rather 
  long 
  hairs 
  ; 
  the 
  small 
  corneae 
  are 
  lateral, 
  and 
  are 
  visible 
  

   only 
  in 
  an 
  inferior 
  view. 
  The 
  epistoma 
  is 
  transversely 
  linear 
  ; 
  the 
  

   antennules 
  transversely 
  plicated 
  ; 
  the 
  basal 
  (or 
  real 
  second) 
  antennal 
  

   joint 
  is 
  slender, 
  and 
  does 
  not 
  nearly 
  reach 
  to 
  the 
  inferior 
  margin 
  of 
  

   the 
  front 
  (see 
  fig. 
  b) 
  ; 
  the 
  flagellum 
  is 
  of 
  moderate 
  length. 
  There 
  

   are 
  no 
  distinct 
  palatal 
  ridges. 
  The 
  outer 
  maxillipedes 
  are 
  broad 
  in 
  

   proportion 
  to 
  their 
  length 
  ; 
  the 
  ischium-joint 
  little 
  broader 
  than 
  

   long; 
  the 
  merus 
  transverse, 
  its 
  extero-dorsal 
  angle 
  prominent. 
  The 
  

   chelipedes 
  are 
  moderately 
  large, 
  the 
  right 
  a 
  little 
  the 
  larger, 
  and 
  the 
  

   margins 
  of 
  the 
  joints 
  are 
  for 
  the 
  most 
  part 
  clothed 
  with 
  rather 
  long 
  

   hairs 
  ; 
  the 
  carpus 
  or 
  wrist 
  is 
  angulated 
  on 
  its 
  inner 
  surface, 
  with 
  

   some 
  long 
  hairs 
  at 
  the 
  angle 
  ; 
  the 
  palm 
  is 
  little 
  longer 
  than 
  broad, 
  

   and 
  vertically 
  deepest 
  at 
  the 
  place 
  of 
  articulation 
  with 
  the 
  mobile 
  

   finger, 
  its 
  margins 
  are 
  not 
  cristatcd, 
  its 
  out^er 
  surface 
  smooth 
  and 
  

  

  * 
  Jouin. 
  Eoy. 
  Dublin 
  Soc. 
  i. 
  p. 
  121, 
  pi. 
  iii. 
  fig. 
  1 
  (1858). 
  

   t 
  ndc 
  Ann. 
  & 
  Mag. 
  Nat. 
  Hist. 
  ser. 
  b, 
  viii. 
  p. 
  259 
  (1881). 
  

  

  r2 
  

  

  