﻿384 
  PROCEEDINGS 
  OF 
  THE 
  CALIFORNIA 
  

  

  really 
  present, 
  and 
  may 
  be 
  found 
  folded 
  up 
  over 
  the 
  back, 
  but 
  concealed 
  beneath 
  

   the 
  carapax. 
  

  

  Nine 
  species 
  of 
  this 
  group 
  are 
  known 
  to 
  inhabit 
  California, 
  but 
  this 
  museum 
  

   only 
  possesses 
  three 
  of 
  them. 
  One 
  of 
  these 
  is 
  as 
  singular 
  as 
  it 
  is 
  rare. 
  Few 
  

   other 
  collections 
  possess 
  specimens 
  of 
  it, 
  and 
  this 
  has 
  but 
  one. 
  The 
  most 
  strik- 
  

   ing 
  characteristic 
  of 
  this 
  species 
  is 
  the 
  great 
  development 
  of 
  the 
  carapax, 
  a 
  

   part 
  which, 
  in 
  most 
  Anomoura, 
  is 
  of 
  moderate 
  size, 
  but 
  which, 
  in 
  this 
  case, 
  forms 
  

   a 
  broad, 
  thin 
  shield, 
  of 
  such 
  dimensions 
  as 
  to 
  completely 
  conceal 
  the 
  legs, 
  an- 
  

   tennaj, 
  abdomen, 
  and 
  every 
  other 
  part 
  viewed 
  from 
  above 
  ; 
  in 
  fact, 
  this 
  crab 
  pre- 
  

   sents 
  nothing 
  but 
  an 
  uneven, 
  brown 
  surface 
  of 
  shell, 
  with 
  a 
  hooked 
  rostrum 
  pro- 
  

   jecting, 
  vizor-like, 
  from 
  its 
  anterior 
  extremity, 
  and 
  enabling 
  the 
  animal 
  to 
  see 
  

   without 
  being 
  seen. 
  The 
  other 
  two 
  species 
  of 
  stone-crabs 
  belong 
  to 
  a 
  genus 
  

   peculiar 
  to 
  this 
  Coast, 
  and 
  are 
  among 
  the 
  largest 
  crabs 
  known, 
  attaining 
  a 
  

   weight 
  of 
  seven 
  pounds, 
  and 
  a 
  width 
  of 
  carapax 
  of 
  ten 
  inches. 
  

  

  Among 
  the 
  long-tailed 
  crabs, 
  or 
  Macroura, 
  there 
  is 
  a 
  family 
  differing 
  greatly 
  

   in 
  habits 
  from 
  our 
  well-known 
  lobsters 
  and 
  shrimps, 
  inasmuch 
  as 
  its 
  members 
  

   excavate 
  subterranean 
  habitations 
  in 
  the 
  sand 
  of 
  the 
  sea-shore, 
  and 
  are, 
  there- 
  

   fore, 
  not 
  joften 
  observed 
  unless 
  properly 
  sought 
  for. 
  A 
  specimen 
  of 
  one 
  of 
  these 
  

   was 
  obtained 
  upon 
  the 
  beach 
  of 
  San 
  Miguel 
  Island, 
  by 
  one 
  of 
  the 
  Coast 
  Sur- 
  

   vey, 
  and 
  presented 
  to 
  the 
  Academy 
  by 
  Prof. 
  Davidson, 
  several 
  months 
  ago. 
  It 
  

   belongs 
  to 
  the 
  genus 
  CaUianassa, 
  distinguished 
  by 
  its 
  soft, 
  thin 
  shell, 
  and 
  smooth 
  

   carapax, 
  as 
  well 
  as 
  by 
  the 
  disproportionately 
  large 
  size 
  of 
  one 
  of 
  the 
  hands, 
  

   which 
  may 
  be 
  either 
  the 
  right 
  or 
  the 
  left 
  in 
  the 
  same 
  species. 
  This 
  species 
  is 
  

   CaUianassa 
  Longimana. 
  Two 
  other 
  species 
  of 
  this 
  genus, 
  C. 
  Calif 
  orniensis 
  , 
  

   of 
  which 
  we 
  possess 
  an 
  example, 
  and 
  C. 
  gigas, 
  which 
  is 
  larger 
  than 
  the 
  others, 
  

   and 
  is 
  yet 
  wanting 
  in 
  our 
  collection, 
  are 
  found 
  on 
  this 
  Coast. 
  

  

  Another 
  digging 
  crustacean, 
  Gebia 
  Pugettensis, 
  also 
  found 
  here, 
  may 
  be 
  known 
  

   by 
  its 
  equal 
  hands 
  and 
  heavy 
  rostrum. 
  

  

  My 
  object 
  in 
  this 
  paper 
  is 
  mainly 
  to 
  draw 
  the 
  attention 
  of 
  the 
  members 
  of 
  

   the 
  Academy 
  to 
  this 
  branch 
  of 
  Zoology, 
  and 
  to 
  induce 
  those 
  who 
  have 
  the 
  op- 
  

   portunity 
  to 
  be 
  on 
  the 
  look-out 
  for 
  crustaceans, 
  as 
  well 
  as 
  for 
  birds 
  and 
  insects. 
  

  

  S. 
  C. 
  Hastings 
  read 
  short 
  papers 
  " 
  On 
  Thunder 
  Storms 
  " 
  ; 
  " 
  On 
  

   Transmission 
  of 
  Musical 
  Sounds 
  bj 
  Telegraph" 
  ; 
  " 
  On 
  Transmis- 
  

   sion 
  of 
  Colors 
  by 
  Telegraph 
  " 
  ; 
  " 
  On 
  Katie 
  King 
  and 
  the 
  Spiritual- 
  

   istic 
  Theories" 
  ; 
  "Questions 
  to 
  the 
  eminent 
  scientist, 
  A. 
  R. 
  Wal- 
  

   lace 
  " 
  ; 
  " 
  On 
  the 
  Creeping 
  of 
  Rails 
  on 
  North 
  and 
  South 
  Railroad 
  

   Tracks." 
  

  

  Remarks 
  on 
  California 
  Coal. 
  

  

  Dr. 
  J. 
  G. 
  Cooper 
  made 
  some 
  verbal 
  remarks 
  on 
  California 
  coal 
  

   as 
  follows 
  : 
  

  

  The 
  papers 
  contain 
  every 
  day 
  several 
  notices 
  of 
  discoveries 
  of 
  coal 
  in 
  Cali- 
  

   fornia, 
  and 
  always 
  mention 
  them 
  as 
  excellent 
  indications, 
  certain 
  to 
  be 
  rich. 
  

  

  