﻿896 
  

  

  Transactions. 
  — 
  Zoology, 
  

  

  of 
  the 
  first 
  joint 
  produced 
  so 
  as 
  to 
  form 
  a 
  very 
  prorainent 
  point, 
  almost 
  

   a 
  spine 
  ; 
  claws 
  half 
  the 
  length 
  of 
  preceding 
  joint 
  ; 
  whole 
  animal 
  destitute 
  

   of 
  hair, 
  except 
  on 
  the 
  fingers. 
  Length, 
  f 
  in. 
  ; 
  breadth, 
  -i 
  in. 
  First 
  three 
  

   pairs 
  of 
  ambulatory 
  legs 
  very 
  long, 
  more 
  than 
  twice 
  the 
  length 
  of 
  the 
  

   carapace. 
  

  

  Hah 
  : 
  Wellington. 
  

  

  Petrolisihes 
  elongatus, 
  Miers. 
  

  

  In 
  the 
  ' 
  Catalogue 
  of 
  New 
  Zealand 
  Crustacea,' 
  p. 
  60, 
  this 
  species 
  is 
  said 
  

   to 
  be 
  of 
  a 
  "reddish-yellow" 
  colour. 
  The 
  specimens 
  from 
  which 
  the 
  

   description 
  was 
  drawn 
  up 
  must 
  have 
  been 
  preserved 
  in 
  spirit. 
  This 
  change 
  

   of 
  colour 
  is 
  usual 
  in 
  specimens 
  so 
  treated. 
  The 
  following 
  is 
  taken 
  from 
  

   living 
  examples. 
  

  

  Above 
  dark 
  blue, 
  greenish-blue, 
  or 
  sometimes 
  even 
  black. 
  Below 
  green, 
  

   getting 
  much 
  darker 
  towards 
  the 
  posterior 
  margin 
  of 
  the 
  anterior 
  legs, 
  

   anterior 
  face 
  of 
  wrist 
  a 
  bright 
  red, 
  mobile 
  finger 
  and 
  antennsB 
  deep 
  brown. 
  

  

  Porcellana 
  riqncola, 
  Stimpson. 
  

  

  A 
  single 
  specimen 
  of 
  this 
  species 
  was 
  

   recently 
  obtained 
  by 
  myself 
  at 
  Lyall 
  Bay, 
  

   living 
  apparently 
  upon 
  terms 
  of 
  intimacy 
  

   with 
  a 
  large 
  family 
  of 
  Petrolisthes 
  elon- 
  

   gatus. 
  Upon 
  a 
  comparison 
  with 
  the 
  foreign 
  

   Crustacea 
  in 
  the 
  Colonial 
  Museum, 
  I 
  find 
  

   it 
  to 
  agree 
  in 
  every 
  particular 
  with 
  a 
  

   specimen 
  contained 
  in 
  the 
  collection 
  

   lately 
  received 
  from 
  Prof. 
  Button 
  of 
  the 
  

   University 
  of 
  California, 
  and 
  labelled 
  as 
  above. 
  

  

  Unfortunately 
  I 
  have 
  not 
  been 
  able 
  to 
  obtain 
  the 
  description 
  either 
  of 
  

   this 
  or 
  the 
  next 
  species, 
  but 
  there 
  can 
  be 
  no 
  doubt 
  respecting 
  their 
  identity, 
  

   as 
  those 
  forwarded 
  by 
  Prof. 
  Button 
  are 
  duplicates 
  of 
  the 
  U.S. 
  Exploring 
  

   Expedition's 
  collection. 
  

  

  This 
  species 
  may 
  be 
  easily 
  distinguished 
  from 
  Petrolisthes 
  elongatus 
  by 
  its 
  

   having 
  the 
  posterior 
  margin 
  of 
  the 
  wrist 
  produced, 
  so 
  as 
  to 
  form 
  one 
  strong 
  

   tooth, 
  by 
  its 
  more 
  drooping 
  front, 
  and 
  by 
  having 
  the 
  lateral 
  margins 
  

   obtuse 
  instead 
  of 
  thin 
  and 
  sharp. 
  Length, 
  | 
  in. 
  ; 
  breadth, 
  f 
  in. 
  

  

  XantJio 
  sjnno 
  -tuber 
  culata, 
  Lockington. 
  

  

  A 
  fine 
  pair 
  of 
  this 
  beautiful 
  little 
  crab 
  was 
  procured 
  at 
  Porirua 
  Harbour, 
  

   in 
  January 
  of 
  last 
  year, 
  and 
  although 
  only 
  about 
  half 
  the 
  size 
  of 
  the 
  Cali- 
  

   fornian 
  specimen, 
  there 
  can 
  be 
  no 
  mistaking 
  their 
  identity. 
  

  

  The 
  carapace 
  is 
  much 
  broader 
  than 
  long, 
  the 
  front 
  armed 
  with 
  spinous 
  

   tubercles 
  ; 
  regions 
  well 
  defined 
  ; 
  anterior 
  legs 
  strong, 
  equal, 
  the 
  outer 
  and 
  

  

  