﻿22 
  

  

  what 
  characteristic 
  surface 
  or 
  sliaHow 
  water 
  fauna 
  of 
  

  

  minute 
  forms. 
  

  

  In 
  St. 
  Jerome's 
  Creek 
  the 
  microscopic 
  fauna 
  of 
  its 
  head 
  

   waters 
  is 
  entirely 
  different 
  from 
  that 
  of 
  the 
  body 
  of 
  the 
  

   creek 
  ; 
  two 
  minute 
  forms 
  inhabit 
  in 
  vast 
  numbers 
  the 
  

   former, 
  while 
  I 
  sought 
  in 
  vain 
  for 
  them 
  in 
  the 
  more 
  open 
  

   and 
  changeable 
  waters 
  of 
  the 
  main 
  body 
  of 
  the 
  inlet, 
  

   which 
  are 
  brought 
  into 
  active 
  movement 
  twice 
  a 
  day 
  by 
  

   the 
  action 
  of 
  the 
  tides. 
  One 
  of 
  these 
  forms 
  an 
  Infuso- 
  

   rian*, 
  l-25th 
  of 
  an 
  inch 
  in 
  length, 
  was 
  found 
  covering 
  

   every 
  available 
  surface 
  of 
  attachment, 
  so 
  that 
  countless 
  

   multitudes 
  of 
  the 
  naked 
  young 
  would 
  be 
  swimming 
  

   about 
  in 
  the 
  water 
  previous 
  to 
  building 
  the 
  curious 
  spiral 
  

   tubes 
  which 
  they 
  inhabit: 
  admirably 
  fitted 
  in 
  this 
  state 
  

   as 
  food 
  for 
  the 
  oyster. 
  Beside 
  the 
  type 
  referred 
  to 
  there 
  

   were 
  a 
  number 
  of 
  other 
  Infusorians 
  which 
  in 
  their 
  so- 
  

   called 
  swarming 
  stages 
  of 
  development, 
  the 
  young 
  would 
  

   become 
  available 
  as 
  oyster 
  food. 
  Of 
  such 
  types 
  I 
  noticed 
  

   four 
  different 
  species, 
  either 
  belonging 
  or 
  very 
  nearly 
  

   related 
  to 
  the 
  genus 
  Cothurnia 
  / 
  all 
  of 
  the 
  forms 
  built 
  

   tubes 
  for 
  themselves. 
  I 
  also 
  noticed 
  several 
  forms 
  of 
  

   bell-animalcules, 
  the 
  swarmers 
  of 
  which 
  would 
  become 
  

   available 
  as 
  food 
  for 
  the 
  oysters 
  lying 
  in 
  the 
  vicinity. 
  

  

  The 
  diatoms 
  did 
  not 
  seem 
  to 
  me 
  to 
  be 
  more 
  abundant 
  

   in 
  the 
  head 
  waters 
  than 
  in 
  the 
  open 
  creek. 
  There 
  was 
  

   one 
  moss 
  animal, 
  of 
  remarkable 
  character, 
  which 
  I 
  found 
  

   in 
  the 
  head 
  waters 
  only, 
  this 
  creature 
  was 
  very 
  abun- 
  

   dant, 
  and 
  no 
  doubt 
  its 
  embryos 
  like 
  those 
  of 
  the 
  infuso- 
  

   ria 
  referred 
  to, 
  were 
  available 
  as 
  food. 
  

  

  Of 
  free 
  swimming 
  Infusorians, 
  I 
  noticed 
  a 
  number 
  of 
  

   genera 
  ; 
  one 
  especially 
  attracted 
  my 
  attention 
  from 
  its 
  

   snake-like 
  appearance 
  and 
  singularly 
  rapid 
  contortions 
  ; 
  

   it 
  had 
  a 
  tuft 
  of 
  vibrating 
  hairs 
  or 
  cilia 
  at 
  the 
  head 
  end 
  in 
  

   close 
  relation 
  with 
  the 
  mouth. 
  Another 
  more 
  abundant 
  

   type 
  was 
  the 
  curious 
  genus 
  Enplofef^, 
  with 
  a 
  thick 
  shell 
  

   enclosing 
  the 
  soft 
  protoplasm 
  of 
  the 
  body 
  ; 
  the 
  latter 
  

  

  *0n 
  the 
  occurrence 
  of 
  /^rc»Vj 
  /r-(7rf«(r 
  /a, 
  Wright, 
  in 
  the 
  Chesapeake 
  Bay. 
  Am. 
  Naturalist, 
  

   1880, 
  pp. 
  8'0 
  — 
  II. 
  

  

  