﻿74 
  DR. 
  G. 
  C. 
  BOURNE 
  ON 
  THE 
  RANINIDjE 
  : 
  

  

  and 
  flattened. 
  First 
  abdominal 
  tergum 
  not 
  much 
  narrower 
  than 
  the 
  posterior 
  

   margin 
  of 
  the 
  carapace, 
  about 
  equal 
  in 
  breadth 
  to 
  the 
  second 
  tergum, 
  the 
  

   remaining 
  terga 
  progressively 
  narrower 
  ; 
  the 
  telson 
  small 
  and 
  triangular. 
  

  

  Notosceles 
  chimmonis, 
  ii. 
  sp. 
  (PI. 
  4. 
  figs. 
  2 
  & 
  3.) 
  

  

  Carapace 
  minutely 
  punctate 
  to 
  smooth 
  over 
  the 
  greater 
  part 
  of 
  iis 
  surface, 
  

   but 
  granular 
  towards 
  the 
  frontal 
  region 
  : 
  proportion 
  of 
  length 
  to 
  breadth 
  of 
  

   carapace 
  about 
  5 
  : 
  3. 
  The 
  frontal 
  region 
  is 
  marked 
  off 
  by 
  a 
  distinct 
  trans- 
  

   verse 
  ridge 
  joining 
  the 
  bases 
  of 
  the 
  extra-orbital 
  spines. 
  The 
  median 
  frontal 
  

   region 
  is 
  fairly 
  broad 
  and 
  produced 
  anteriorly 
  into 
  a 
  median 
  pointed 
  rostral 
  

   spine 
  at 
  either 
  side 
  of 
  the 
  base 
  of 
  which 
  is 
  a 
  triangular 
  flattened 
  and 
  some- 
  

   what 
  upturned 
  spine, 
  the 
  margins 
  of 
  all 
  three 
  spines 
  minutely 
  serrated. 
  On 
  

   either 
  side 
  a 
  fissure 
  separates 
  the 
  median 
  frontal 
  projection 
  from 
  a 
  short 
  

   triangular 
  tooth 
  or 
  spine, 
  and 
  outside 
  the 
  latter 
  is 
  a 
  prominent 
  incurved 
  

   extra-orbital 
  spine. 
  A 
  single 
  lateral 
  spine 
  occurs 
  on 
  either 
  side 
  of 
  the 
  cara- 
  

   pace 
  a 
  short 
  distance 
  behind 
  the 
  extra-orbital 
  spine, 
  and 
  nearly 
  of 
  the 
  same 
  

   size 
  as 
  the 
  latter. 
  On 
  the 
  upper 
  surface 
  a 
  slight 
  carina 
  runs 
  from 
  the 
  

   median 
  rostral 
  spine 
  to 
  the 
  transverse 
  granular 
  ridge 
  separating 
  the 
  fronto- 
  

   orbital 
  region 
  from 
  the 
  rest 
  of 
  the 
  carapace. 
  In 
  the 
  chelipeds 
  the 
  anterior 
  

   edge 
  of 
  the 
  ischium 
  is 
  serrated 
  ; 
  the 
  merus 
  largely 
  dilated 
  externally 
  at 
  its 
  

   base 
  ; 
  the 
  carpus 
  granular 
  above 
  and 
  without 
  a 
  distal 
  spine 
  ; 
  the 
  propodus 
  

   bears 
  two 
  subequal 
  spines 
  on 
  its 
  lower 
  margin, 
  and 
  on 
  its 
  upper 
  surface 
  are 
  

   two 
  parallel 
  ridges 
  separated 
  by 
  a 
  narrow 
  groove 
  ; 
  the 
  immobile 
  claw 
  bears 
  

   four 
  denticles 
  on 
  its 
  inner 
  margin. 
  In 
  the 
  third 
  maxillipeds 
  the 
  relative 
  

   length 
  of 
  the 
  merus 
  to 
  the 
  ischium 
  is 
  as 
  6 
  : 
  10 
  ; 
  the 
  lower 
  surface 
  of 
  the 
  

   merus 
  is 
  granular 
  and 
  hairy. 
  The 
  pterygostomial 
  regions 
  are 
  hairy. 
  In 
  the 
  

   sternal 
  region 
  the 
  chelipedal 
  sternum 
  is 
  of 
  the 
  shape 
  characteristic 
  of 
  

   the 
  Raninidpe, 
  the 
  following 
  sternal 
  element 
  flat, 
  broad 
  in 
  front 
  and 
  narrow 
  

   posteriorly; 
  the 
  third 
  element 
  of 
  the 
  sternal 
  plastron 
  triangular, 
  convex, 
  the 
  

   apex 
  of 
  the 
  triangle 
  anterior. 
  The 
  articular 
  ca\ities 
  of 
  the 
  first 
  and 
  second 
  

   pereiopods 
  approximated 
  to 
  the 
  middle 
  line. 
  The 
  first 
  abdominal 
  tergum 
  is 
  

   flat 
  and 
  quadrangular, 
  not 
  much 
  narrower 
  than 
  the 
  posterior 
  margin 
  of 
  the 
  

   carapace; 
  the 
  second 
  abdominal 
  tergum 
  is 
  nearly 
  equal 
  to 
  it 
  in 
  width; 
  the 
  

   remaining 
  abdominal 
  terga 
  narrow 
  rapidly 
  and 
  the 
  telson 
  is 
  small 
  and 
  sub- 
  

   triangular 
  in 
  shape. 
  

  

  Two 
  specimens 
  from 
  the 
  Sulu 
  Sea, 
  both 
  males. 
  Length 
  of 
  the 
  larger 
  

   specimen 
  with 
  the 
  abdomen 
  fully 
  extended 
  28 
  mm. 
  : 
  length 
  of 
  carapace 
  

   20 
  mm. 
  : 
  greatest 
  width 
  of 
  carapace 
  13 
  mm. 
  

  

  The 
  species 
  is 
  named 
  after 
  Captain 
  Chimmo, 
  R.N., 
  of 
  H.M.S. 
  'Nassau,' 
  

   whose 
  collections 
  from 
  the 
  Sulu 
  Sea 
  were 
  presented 
  to 
  the 
  Oxford 
  University 
  

   Museum 
  in 
  1872. 
  

  

  I 
  am 
  of 
  the 
  opinion 
  that 
  Raninoides 
  serratifrons, 
  Henderson 
  (36) 
  should 
  

  

  