﻿iNRODucTioN. 
  PanaTiia 
  Shells. 
  241 
  

  

  by 
  Lieut. 
  Green 
  merit 
  especial 
  notice. 
  This 
  officer 
  collected 
  

   more 
  than 
  2f)0 
  species, 
  and 
  carefully 
  noted 
  the 
  habitat 
  of 
  the 
  

   specimens. 
  Of 
  those 
  which 
  have 
  been 
  determined 
  by 
  Dr. 
  

   Gould, 
  and 
  which 
  were 
  also 
  found 
  by 
  us 
  at 
  Panama, 
  we 
  

   have 
  incorporated 
  into 
  the 
  following 
  paper 
  the 
  habitats 
  ob- 
  

   served 
  by 
  Lieut. 
  Green. 
  This 
  collection 
  proves 
  conclusively 
  

   that 
  Upper 
  California 
  belongs 
  to 
  a 
  distinct 
  Zoological 
  province. 
  

   The 
  shells 
  collected 
  by 
  Nuttall 
  in 
  Upper 
  California 
  in 
  1836, 
  

   and 
  described 
  in 
  the 
  Journ. 
  Acad. 
  Nat. 
  Scs. 
  of 
  Philadelphia, 
  

   VII, 
  in 
  1837, 
  confirm 
  this 
  inference. 
  None 
  of 
  them 
  are 
  identi- 
  

   cal 
  with 
  the 
  species 
  which 
  inhabit 
  Panama. 
  

  

  Narrative 
  of 
  the 
  Expedition. 
  

   In 
  November, 
  1850, 
  I 
  left 
  home 
  with 
  the 
  design 
  of 
  spend- 
  

   ing 
  a 
  few 
  weeks 
  on 
  the 
  Isthmus 
  of 
  Panama, 
  and 
  the 
  remainder 
  

   of 
  the 
  winter 
  in 
  Jamaica. 
  Leave 
  of 
  absence 
  not 
  having 
  been 
  

   granted 
  until 
  Nov. 
  6, 
  the 
  preparations 
  were 
  few 
  and 
  hasty. 
  

   On 
  the 
  afternoon 
  of 
  the 
  13th 
  I 
  sailed 
  from 
  New 
  York 
  in 
  the 
  

   Steamer 
  Empire 
  City, 
  Captain 
  .1. 
  D. 
  Wilson,* 
  and 
  on 
  the 
  mor- 
  

   ning 
  of 
  the 
  22nd, 
  landed 
  at 
  Chagres. 
  Most 
  of 
  that 
  day 
  was 
  

   occupied 
  in 
  rambling 
  about 
  the 
  shores. 
  A 
  few 
  shells 
  were 
  

   found 
  of 
  the 
  same 
  species, 
  which 
  occur 
  throughout 
  the 
  Carib- 
  

   bean 
  seas. 
  But 
  near 
  Chagres 
  the 
  shores 
  are 
  too 
  much 
  exposed 
  to 
  

   sustain 
  many 
  species 
  of 
  MoUnsks. 
  In 
  the 
  afternoon. 
  Captain 
  

   Knight, 
  his 
  clerk, 
  and 
  myself 
  hir^d 
  a 
  boat 
  and 
  started 
  for 
  

   Cruces, 
  where 
  we 
  arrived 
  on 
  the 
  evening 
  of 
  the 
  25th. 
  The 
  

  

  * 
  Since 
  it 
  must 
  be 
  confessed 
  that 
  American 
  naturalists 
  find 
  little 
  sympathy 
  

   witli 
  their 
  pursuits 
  among 
  most 
  of 
  their 
  countrymen 
  of 
  all 
  classes, 
  it 
  affords 
  me 
  

   tlie 
  more 
  pleasure 
  to 
  acknowledge 
  my 
  obligations 
  to 
  the 
  owners 
  of 
  the 
  Steamer, 
  

   Messrs. 
  J. 
  Howard 
  & 
  Son, 
  for 
  a 
  passage 
  to 
  Cliagres 
  ; 
  and 
  to 
  Capt. 
  Wilson 
  for 
  

   various 
  attentions 
  on 
  the 
  voyage, 
  and 
  subsequently 
  at 
  the 
  monthly 
  visits 
  of 
  the 
  

   Steamer 
  to 
  Jamaica. 
  To 
  Capt. 
  E. 
  Knight, 
  agent 
  of 
  the 
  Pacific 
  Mail 
  Steam 
  Ship 
  

   Co., 
  and 
  my 
  travelling 
  companion 
  across 
  the 
  Isthmus, 
  I 
  was 
  especially 
  indebted 
  

   for 
  unusual 
  facilities 
  in 
  crossing, 
  as 
  well 
  as 
  for 
  other 
  aid. 
  Good 
  company, 
  and 
  the 
  

   extraordinary 
  beauties 
  of 
  nature, 
  more 
  than 
  compensated 
  for 
  four 
  days 
  saturation 
  

   in 
  mud 
  and 
  wutt^r 
  during 
  the 
  ti°ausit. 
  

  

  