﻿678 
  ritOCEEDINdS 
  of 
  the 
  national 
  museum. 
  vol,. 
  XX. 
  

  

  PARANEPHROPS 
  PLANIFRONS 
  White. 
  

  

  I'arainphroiJS 
  phmifrons 
  WiiitE; 
  Gray's 
  Zoolog. 
  Miscell., 
  No. 
  II, 
  p. 
  7*J, 
  1842; 
  

  

  Dieffeiibach's 
  Travels 
  in 
  New 
  Zealand, 
  II, 
  p. 
  267, 
  1843; 
  List 
  C'nist. 
  15i'it. 
  

  

  Mas., 
  p. 
  72, 
  1847 
  (no 
  description). 
  

   f 
  Parancpliropa 
  tcnmeornis 
  Dana, 
  U. 
  S. 
  Explor. 
  Exi)ed., 
  XIII, 
  Crust., 
  Vt. 
  1, 
  ]>. 
  527, 
  

  

  1852; 
  Atlas, 
  pi. 
  xxxiii, 
  fig. 
  4, 
  1855. 
  

   Farancplirops 
  tcuuicoriiis 
  Hellek, 
  Reise 
  der 
  Novara, 
  Zoolog. 
  Tb., 
  II, 
  Pt. 
  3, 
  

  

  Crust., 
  p. 
  104, 
  1865. 
  

   Paratuplirops 
  jilaiiifrons 
  Miers, 
  Zool. 
  " 
  Erebus 
  aud 
  Terror,"' 
  Crust., 
  j). 
  4, 
  pi. 
  in, 
  

  

  i'lg. 
  1, 
  1874; 
  Cat. 
  Stalk- 
  and 
  Sessile-eyed 
  Crustacea 
  of 
  Xew 
  Zealand, 
  ]). 
  72, 
  

  

  1870; 
  Auu. 
  Mag. 
  Nat. 
  Hist., 
  4th 
  ser., 
  XVIII, 
  p. 
  413, 
  1876; 
  Trans, 
  and 
  Prof. 
  

  

  New 
  Zealand 
  lust., 
  IX, 
  p. 
  476, 
  1877. 
  

   I'arancphrops 
  plan 
  if 
  roil 
  s 
  IIuxlky, 
  Proc. 
  Zool. 
  Soc. 
  London, 
  1<S78, 
  p. 
  770. 
  

   Farancplirops 
  pJanifrons 
  Chilton, 
  Trans, 
  and 
  Proc. 
  New 
  Zealand 
  lust., 
  XXI, 
  

  

  pp. 
  242, 
  249, 
  pi. 
  X, 
  figs. 
  1-3, 
  1888. 
  

  

  Types 
  iu 
  British 
  Museum 
  (White, 
  Miers). 
  

  

  Paranephroiis 
  plan'tfrons 
  is 
  a 
  very 
  puzzling 
  species. 
  The 
  type 
  local- 
  

   ity 
  is 
  the 
  river 
  Thames, 
  Korth 
  Island, 
  Kew 
  Zealand. 
  In 
  specimens 
  

   from 
  Puriri 
  Creek, 
  a 
  tributary 
  of 
  the 
  Thames, 
  the 
  rostrum 
  tapers 
  off 
  

   into 
  a 
  long 
  and 
  sharp 
  acumen, 
  which 
  overreaches 
  the 
  distal 
  end 
  of 
  the 
  

   antennular 
  peduncle. 
  Each 
  side 
  of 
  the 
  rostrum 
  is 
  armed 
  with 
  three 
  

   teeth, 
  which 
  are 
  produced 
  into 
  long 
  spine-like 
  points. 
  In 
  one 
  of 
  the 
  

   five 
  specimens 
  before 
  me 
  there 
  are 
  four 
  spines 
  on 
  the 
  right 
  side, 
  three 
  

   on 
  the 
  left; 
  the 
  lower 
  side 
  of 
  the 
  rostrum 
  is 
  furnished 
  with 
  one 
  or 
  two 
  

   spines. 
  The 
  antennal 
  scale 
  is 
  long, 
  and 
  diminishes 
  in 
  width 
  from 
  the 
  

   basal 
  third 
  to 
  the 
  tip; 
  it 
  exceeds 
  the 
  rostrum 
  in 
  length. 
  The 
  postor- 
  

   bital 
  ridge 
  is 
  interrupted 
  between 
  the 
  two 
  sharp 
  s^jines 
  Avith 
  which 
  it 
  is 
  

   armed. 
  A 
  median 
  ridge 
  runs 
  along 
  the 
  gastric 
  area, 
  reaching 
  forward 
  

   as 
  far 
  as 
  the 
  anterior 
  pair 
  of 
  postorbital 
  spines, 
  but 
  not 
  continued 
  on 
  

   the 
  rostrum. 
  There 
  are 
  two 
  or 
  three 
  sharj) 
  spines 
  on 
  each 
  side 
  of 
  the 
  

   carapace, 
  just 
  behind 
  the 
  cervical 
  groove, 
  besides 
  several 
  more 
  on 
  the 
  

   hepatic 
  and 
  pterygostomian 
  regions. 
  The 
  areola 
  is 
  very 
  short 
  and 
  

   broad 
  — 
  not 
  much 
  over 
  one-third 
  as 
  long 
  as 
  the 
  distance 
  from 
  the 
  cervi- 
  

   cal 
  groove 
  to 
  the 
  tip 
  of 
  the 
  rostrum. 
  The 
  abdominal 
  pleura? 
  are 
  

   bluntly 
  angulated. 
  The 
  hand 
  is 
  long 
  and 
  narrow, 
  its 
  superior 
  and 
  

   inferior 
  margins 
  nearly 
  straight, 
  parallel, 
  and 
  armed 
  with 
  a 
  double 
  

   row^ 
  of 
  spines 
  — 
  those 
  on 
  the 
  superior 
  margin 
  the 
  longest. 
  The 
  inner 
  

   and 
  outer 
  faces 
  of 
  the 
  hand 
  are 
  convex 
  and 
  sparsely 
  armed 
  with 
  spines, 
  

   the 
  largest 
  of 
  which 
  are 
  disposed 
  in 
  a 
  median 
  longitudinal 
  row 
  on 
  each 
  

   face. 
  

  

  Specimens 
  from 
  Karaka, 
  Manukau 
  Harbor 
  (near 
  Auckland), 
  are 
  alto- 
  

   gether 
  similar 
  to 
  typical 
  examples 
  from 
  the 
  Thames. 
  The 
  largest 
  of 
  

   these 
  (an 
  ovigerous 
  female) 
  measures 
  83 
  mm. 
  from 
  tip 
  of 
  rostrum 
  to 
  end 
  

   of 
  telson. 
  

  

  Individuals 
  from 
  localities 
  soiith 
  of 
  the 
  Thames 
  basin, 
  from 
  the 
  lake 
  

   called 
  Eoto-Iti 
  (Xorth 
  Island) 
  southward 
  to 
  Cook 
  Strait 
  and 
  beyond, 
  

   differ 
  almost 
  constantly 
  from 
  the 
  typical 
  form 
  in 
  having 
  a 
  shorter 
  rostral 
  

   acumen, 
  shorter 
  lateral 
  rostral 
  teeth, 
  shorter 
  and 
  broader 
  antennal 
  

  

  