﻿25-4 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  cherrima, 
  from 
  Darnley 
  Island, 
  with 
  Eell's 
  type 
  of 
  A. 
  septemspinosa. 
  

   (whicli 
  is 
  registered 
  as 
  from 
  Borneo, 
  and 
  is 
  not, 
  as 
  Bell 
  states, 
  of 
  

   unknown 
  locality) 
  in 
  the 
  Museum 
  collection 
  establishes 
  the 
  identity 
  

   of 
  the 
  two 
  species. 
  There 
  is 
  in 
  reality 
  no 
  median 
  posterior 
  mar- 
  

   ginal 
  spine 
  in 
  A. 
  septemspinosa, 
  the 
  one 
  shown 
  in 
  the 
  figure 
  (and 
  

   made 
  much 
  too 
  prominent) 
  being 
  the 
  posterior 
  spine 
  or 
  tubercle 
  of 
  

   the 
  median 
  longitudinal 
  dorsal 
  series, 
  which 
  is 
  situated 
  above 
  the 
  

   posterior 
  margin. 
  Hence 
  the 
  name 
  septemspinosa 
  is 
  inappropriate 
  

   for 
  this 
  species 
  ; 
  and 
  as, 
  moreover, 
  the 
  same 
  specific 
  description 
  is 
  

   used 
  in 
  the 
  genus 
  Iphis, 
  which, 
  as 
  I 
  have 
  already 
  noticed*, 
  is 
  

   scarcely 
  distinct 
  from 
  Arcania, 
  I 
  prefer 
  to 
  retain 
  Mr. 
  Haswell's 
  

   specific 
  name. 
  

  

  108. 
  Lithadia? 
  sculpta, 
  Hasioell. 
  

  

  A 
  male 
  of 
  this 
  very 
  interesting 
  little 
  species 
  was 
  dredged 
  in 
  the 
  

   Arafura 
  Sea 
  at 
  32-36 
  fms. 
  (No. 
  160), 
  where 
  so 
  many 
  other 
  remark- 
  

   able 
  species 
  were 
  obtained. 
  A 
  dried 
  female 
  is 
  in 
  the 
  British 
  Museum, 
  

   from 
  the 
  collection 
  of 
  H.M.S. 
  ' 
  Samarang,' 
  but 
  without 
  any 
  special 
  

   indication 
  of 
  locality. 
  Mr. 
  HasweU's 
  types 
  were 
  from 
  the 
  Fitzroy 
  

   Islands. 
  

  

  109. 
  Oreopliorus 
  reticulatus, 
  Adams 
  Sf 
  White. 
  

  

  An 
  adult 
  female 
  from 
  Thursday 
  Island, 
  4-5 
  fms. 
  (No. 
  165), 
  and 
  

   a 
  smaller 
  specimen 
  of 
  the 
  same 
  sex 
  from 
  Friday 
  Island, 
  10 
  fms. 
  

   (No. 
  153), 
  seem 
  to 
  belong 
  to 
  this 
  species. 
  

  

  The 
  specimens 
  in 
  the 
  British-Museum 
  collection 
  are 
  from 
  the 
  

   Straits 
  of 
  Sunda 
  {H.M.S. 
  ^Samarang') 
  and 
  Philippines 
  {Cuming). 
  

  

  From 
  0. 
  frontalis 
  this 
  variable 
  species 
  may, 
  it 
  would 
  appear, 
  

   always 
  be 
  distinguished 
  by 
  its 
  very 
  much 
  less 
  prominent 
  and 
  non- 
  

   emarginate 
  front. 
  

  

  110. 
  Oreophorus 
  frontalis. 
  (Plate 
  XXVI. 
  fig. 
  B.) 
  

  

  The 
  carapace 
  is 
  transverse 
  and 
  laterally 
  produced 
  at 
  the 
  branchial 
  

   regions 
  over 
  the 
  bases 
  of 
  the 
  ambulatory 
  legs 
  ; 
  the 
  margins 
  of 
  

   the 
  carapace 
  at 
  this 
  part 
  form 
  a 
  distinct 
  angle 
  x^dth 
  the 
  antero- 
  

   lateral 
  margins. 
  The 
  front 
  is 
  very 
  prominent, 
  and 
  divided 
  by 
  a 
  

   very 
  shallow 
  median 
  notch 
  into 
  two 
  rounded 
  lobes 
  ; 
  it 
  is 
  uniformly 
  

   granulated 
  above. 
  The 
  surface 
  of 
  the 
  carapace 
  (seen 
  under 
  a 
  suffi- 
  

   cient 
  magnifying-power) 
  is 
  granulated, 
  the 
  granules 
  most 
  numerous 
  

   towards 
  the 
  posterior 
  and 
  postero-lateral 
  margins, 
  and, 
  where 
  not 
  

   granulated, 
  it 
  is 
  closely 
  and 
  finely 
  punctulated 
  ; 
  the 
  hepatic 
  regions 
  

   are 
  separated 
  from 
  the 
  adjoining 
  parts 
  by 
  a 
  well-defined 
  semicircular 
  

   suture, 
  the 
  branchial 
  regions 
  near 
  to 
  the 
  middle 
  line 
  are 
  strongly 
  

   convex. 
  There 
  is 
  a 
  prominent 
  triangLilar 
  acute 
  lobe 
  on 
  the 
  pterygo- 
  

   stomian 
  regions. 
  All 
  the 
  postabdominal 
  segments 
  appear 
  to 
  be 
  

   distinct, 
  the 
  postabdomen, 
  sternal 
  surface, 
  and 
  inferior 
  parts 
  of 
  the 
  

   carapace 
  generally 
  being 
  granulated 
  ; 
  a 
  more 
  prominent 
  tubercle 
  

  

  * 
  Vide 
  Ann. 
  & 
  Mag. 
  Nat. 
  Hist. 
  ser. 
  5, 
  v. 
  p. 
  317 
  (1880). 
  

  

  