﻿682 
  ntOCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  ParanepJirops 
  sefosus 
  is 
  nearly 
  related 
  to 
  P. 
  zealandicus, 
  but 
  may 
  be 
  

   distill 
  gui 
  si 
  led 
  by 
  the 
  following- 
  cbjiracters: 
  The 
  cephalothorax 
  is 
  more 
  

   oval 
  than 
  in 
  P. 
  zealandicns, 
  owing- 
  to 
  the 
  bulging 
  of 
  the 
  sides 
  of 
  the 
  

   carapace; 
  the 
  sides 
  of 
  the 
  carapace 
  are 
  thickly 
  strewn 
  with 
  acute, 
  

   forward-turned 
  spines, 
  which 
  take 
  the 
  place 
  of 
  the 
  rounded 
  tubercles 
  

   in 
  P. 
  zealandicus. 
  The 
  rostrum 
  and 
  antennal 
  scale 
  are 
  longer, 
  the 
  lat- 
  

   eral 
  rostral 
  teeth 
  longer 
  and 
  more 
  spiniform; 
  the 
  rostrum 
  is 
  furnished 
  

   with 
  an 
  evident 
  median 
  keel, 
  most 
  prominent 
  on 
  the 
  distal 
  half 
  of 
  the 
  

   rostrum 
  (in 
  P. 
  zealandicus 
  there 
  is 
  a 
  gastric 
  keel, 
  but 
  no 
  keel 
  on 
  the 
  ros- 
  

   trum). 
  These 
  characters 
  are 
  manifest 
  even 
  in 
  small 
  specimens 
  not 
  

   more 
  than 
  65 
  mm. 
  in 
  length, 
  although 
  in 
  them 
  the 
  carapacial 
  spines 
  are 
  

   much 
  reduced 
  in 
  number 
  — 
  limited, 
  indeed, 
  to 
  the 
  hepatic 
  area 
  and 
  the 
  

   parts 
  near 
  the 
  cervical 
  groove. 
  In 
  P. 
  sealandicus 
  of 
  a 
  similar 
  size 
  

   the 
  carapace 
  is 
  smooth. 
  

  

  The 
  number 
  of 
  spines 
  on 
  each 
  side 
  of 
  the 
  rostrum 
  varies 
  between 
  

   three 
  and 
  six. 
  In 
  every 
  specimen 
  I 
  have 
  examined 
  there 
  is 
  at 
  least 
  one 
  

   spine 
  on 
  the 
  under 
  side 
  of 
  the 
  rostrum 
  ; 
  in 
  several 
  individuals 
  there 
  

   are 
  two, 
  in 
  one 
  individual 
  three. 
  

  

  The 
  largest 
  specimen 
  before 
  me 
  is 
  115 
  mm. 
  long. 
  

  

  When 
  Professor 
  Hutton 
  described 
  P. 
  setosus 
  he 
  was 
  apparently 
  

   unacquainted 
  with 
  White's 
  description 
  of 
  P. 
  zecdandicus,^ 
  and 
  his 
  type 
  

   material 
  probably 
  included 
  both 
  the 
  present 
  species 
  and 
  P. 
  zealandicns, 
  

   for 
  he 
  gives 
  as 
  the 
  habitat 
  of 
  P. 
  setosns 
  "stream 
  near 
  Invercargill, 
  

   Province 
  of 
  Otago, 
  and 
  the 
  river 
  Avon, 
  near 
  Christchurch, 
  Canter- 
  

   bury." 
  The 
  form 
  from 
  Invercargill 
  is 
  presumably 
  (from 
  what 
  we 
  know 
  

   of 
  the 
  distribution 
  of 
  the 
  iSTew 
  Zealand 
  crayfishes) 
  P. 
  zeahmdicus. 
  

   This 
  is 
  rendered 
  the 
  more 
  certain 
  in 
  that 
  Chilton- 
  tells 
  us 
  that 
  a 
  large 
  

   specimen 
  in 
  the 
  Otago 
  Museum, 
  labeled 
  P. 
  setosus 
  by 
  Professor 
  Hutton 
  

   himself, 
  has 
  a 
  cylindrical 
  carapace, 
  furnished 
  with 
  numerous 
  rounded 
  

   tubercles 
  — 
  features 
  peculiar 
  to 
  large 
  specimens 
  of 
  P. 
  zealandicKS. 
  

   Hutton's 
  description, 
  however, 
  seems 
  to 
  have 
  been 
  drawn 
  up 
  from 
  the 
  

   Avon 
  River 
  form, 
  to 
  which 
  the 
  name 
  setosus 
  may 
  be 
  properly 
  restricted. 
  

   I 
  have 
  received 
  specimens 
  of 
  P. 
  setosKs 
  {scitsu 
  strictiori) 
  from 
  Mr. 
  Chil- 
  

   ton, 
  collected 
  in 
  the 
  neighborhood 
  of 
  Christchurch, 
  in 
  the 
  Avon 
  and 
  

   Heathcote 
  rivers, 
  and 
  one 
  pair 
  taken 
  at 
  Eangiora, 
  fifteen 
  or 
  twenty 
  

   miles 
  north 
  of 
  Christchurch. 
  

  

  Mr. 
  Chilton'' 
  considers 
  P. 
  zealandkms 
  and 
  P. 
  setosus 
  to 
  be 
  one 
  and 
  

   the 
  same 
  species. 
  As 
  fiir 
  as 
  can 
  be 
  determined 
  from 
  the 
  material 
  at 
  

   my 
  disposal, 
  the 
  two 
  species 
  are 
  perfectly 
  distinct, 
  even 
  young, 
  very 
  

   small 
  specimens 
  being 
  easily 
  distinguiwShable. 
  

  

  List 
  of 
  specimens 
  examined 
  : 
  

  

  River 
  Avon, 
  Christchurch, 
  New 
  Zealand 
  (South 
  Island), 
  four 
  males, 
  

   four 
  females 
  (Coll. 
  Mus. 
  Comp. 
  Zool. 
  and 
  Coll. 
  Dunedin 
  Mus.); 
  river 
  

   Heathcote, 
  near 
  Christchurch, 
  New 
  Zealand 
  (South 
  Island), 
  one 
  male, 
  

  

  1 
  Chilton, 
  Trans. 
  New 
  Zetiland 
  Inst., 
  XXI, 
  p. 
  237. 
  

  

  2 
  Ibid., 
  p. 
  248. 
  

   3Ibid.,p.238. 
  

  

  