﻿666 
  rnOCEEDIXGS 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  vol.xx 
  

  

  from 
  Potlatcli 
  Creek, 
  at 
  Lewiston, 
  Idaho, 
  with 
  the 
  geiierjil 
  fades 
  of 
  A. 
  

   klamatJiensis, 
  show 
  certain 
  characters 
  of 
  ^4. 
  tronbridfiii. 
  For 
  instance, 
  

   iu 
  most 
  of 
  them 
  the 
  posterior 
  pair 
  of 
  postorbital 
  spines 
  is 
  very 
  evi- 
  

   dent, 
  Avhile 
  tlie 
  rostral 
  spines, 
  the 
  apical 
  spine 
  ol' 
  the 
  autennal 
  scale, 
  

   the 
  external 
  spine 
  of 
  the 
  second 
  segment 
  of 
  the 
  antenna, 
  and 
  the 
  spine 
  

   at 
  the 
  anterior 
  internal 
  ani>ie 
  of 
  the 
  carpus 
  are 
  much 
  more 
  strongly 
  

   developed 
  than 
  iu 
  typical 
  specimens 
  of 
  .4^. 
  klamathoms. 
  

  

  ASTACUS 
  TROWBRIDGII 
  Stimpson. 
  

  

  A 
  large 
  female 
  specimen, 
  138 
  mm. 
  long 
  (Coll. 
  U.S.N.M.), 
  said 
  to 
  

   have 
  been 
  taken 
  from 
  a 
  bunch 
  of 
  seaweed 
  in 
  salt 
  water 
  at 
  Monterey, 
  

   California, 
  approaches 
  A. 
  hniusculus 
  in 
  three 
  respects, 
  namely: 
  The 
  

   posterior 
  pair 
  of 
  spines 
  on 
  the 
  back 
  of 
  the 
  carapace, 
  behind 
  the 
  eyes, 
  

   are 
  rather 
  more 
  strongly 
  developed 
  than 
  in 
  the 
  typical 
  .4. 
  trowhridgii 
  ; 
  

   the 
  rostral 
  acumen 
  is 
  as 
  long 
  as 
  in 
  A. 
  leniKsctilus 
  ; 
  the 
  tubercle 
  at 
  the 
  

   orifice 
  of 
  the 
  green 
  gland 
  ends 
  iu 
  a 
  sharp, 
  horny 
  point. 
  In 
  other 
  

   respects 
  this 
  specimen 
  agrees 
  Avith 
  A. 
  troivbridgii. 
  The 
  body 
  is 
  very 
  

   broad 
  across 
  the 
  branchial 
  region, 
  and 
  there 
  are 
  three 
  spines 
  on 
  the 
  

   left 
  side 
  of 
  the 
  telsou, 
  two 
  on 
  the 
  right. 
  There 
  is 
  a 
  rudimentary^ 
  limb 
  

   on 
  the 
  right 
  side 
  of 
  the 
  first 
  abdominal 
  segment, 
  a 
  condition 
  seldom 
  

   seen 
  in 
  the 
  American 
  species 
  of 
  Astacus. 
  

  

  Astacus 
  troivbridgii 
  has 
  been 
  previously 
  known 
  only 
  from 
  the 
  region 
  

   near 
  the 
  mouth 
  of 
  the 
  Columbia 
  River. 
  

  

  ASTACUS 
  LENIUSCULUS 
  Dana. 
  

  

  There 
  is 
  a 
  large 
  female, 
  122 
  mm. 
  long, 
  from 
  San 
  Francisco 
  County, 
  

   California, 
  in 
  the 
  collection 
  of 
  the 
  California 
  Academy 
  of 
  Sciences 
  (No. 
  

   3259). 
  The 
  right 
  and 
  left 
  chelipeds 
  of 
  this 
  specimen 
  are 
  of 
  equal 
  size; 
  

   the 
  upper 
  margin 
  of 
  the 
  right 
  nierus 
  is 
  armed 
  with 
  two 
  spines, 
  of 
  the 
  

   left 
  merus 
  with 
  three 
  spines; 
  the 
  telson 
  is 
  armed 
  with 
  one 
  spine 
  on 
  

   the 
  right 
  side, 
  two 
  on 
  the 
  left. 
  This 
  s[)ecies 
  has 
  been 
  previously 
  

   recorded 
  from 
  the 
  Columbia 
  River 
  and 
  Puget 
  Sound. 
  

  

  ASTACUS 
  GAMBELII 
  (Girard). 
  

  

  Crawfish 
  Creek, 
  at 
  Moose 
  Falls, 
  one 
  mile 
  above 
  junction 
  with 
  Lewis 
  

   River, 
  Yellowstone 
  National 
  Park, 
  Wyoming; 
  Snake 
  River, 
  just 
  south 
  

   of 
  Yellowstone 
  Park, 
  Wyoming; 
  Mink 
  Creek 
  and 
  Port 
  Neuve 
  River, 
  

   Pocatello, 
  Idaho; 
  Shoshone 
  Falls, 
  Idaho; 
  lUue 
  Lakes, 
  four 
  miles 
  below 
  

   Shoshone 
  Falls, 
  Idaho 
  (Coll.U.S.N.M.). 
  

  

  All 
  of 
  these 
  localities 
  are 
  in 
  the 
  Snake 
  River 
  drainage. 
  

  

  ASTACUS 
  TORRENTIUM 
  (Schrank). 
  

  

  Recorded 
  from 
  Cologne, 
  Germany, 
  and 
  from 
  St. 
  Galleu, 
  eastern 
  Switz- 
  

   erland, 
  by 
  Doctor 
  A. 
  P. 
  N'inni.^ 
  

  

  ' 
  Atti 
  della 
  Soc. 
  Italiana 
  di 
  Sci. 
  Nat., 
  XXIX, 
  pp. 
  322-326, 
  1886. 
  

  

  