﻿25 
  

  

  of 
  attachment 
  for 
  siiiiilav 
  <'(»l()i)ies 
  and 
  tliat 
  liei-e 
  and 
  there 
  

   where 
  some 
  of 
  tlie 
  individuals 
  of 
  a 
  colony 
  <.)i 
  ZdC^ilia 
  m 
  ni- 
  

   uiN 
  had 
  been 
  separated 
  from 
  their 
  stalks, 
  numerous 
  

   minute 
  rod-like 
  vibriones 
  had 
  affixed 
  themselves 
  by 
  one 
  

   end. 
  In 
  this 
  way 
  it 
  happens 
  that 
  there 
  is 
  a 
  quadrui)le 
  

   conimensalism 
  established, 
  since 
  we 
  have 
  the 
  VibrionevS 
  

   fixed 
  and 
  probably 
  nourished 
  from 
  the 
  stalks 
  of 
  the 
  Zao- 
  

   tlimnnliinii^ 
  while 
  the 
  latter 
  is 
  ben(^htted 
  by 
  the 
  stream 
  

   of 
  water 
  drawn 
  in 
  by 
  the 
  cilia 
  of 
  the 
  oyster, 
  and 
  the 
  last 
  

   feeds 
  itself 
  and 
  its 
  protege, 
  the 
  crab, 
  from 
  the 
  same 
  food- 
  

   bearing 
  current. 
  Possibly 
  the 
  cral) 
  inside 
  the 
  shell 
  

   catches 
  and 
  swallows 
  food 
  which 
  in 
  its 
  entire 
  state 
  could 
  

   not 
  be 
  taken 
  by 
  the 
  oyster, 
  but 
  in 
  any 
  event 
  the 
  small 
  

   crumbs 
  which 
  Avould 
  fall 
  from 
  the 
  mouth 
  and 
  claws 
  of 
  

   the 
  crab 
  would 
  be 
  carried 
  to 
  the 
  mouth 
  of 
  the 
  oyster, 
  so 
  

   that 
  nothing 
  is 
  wasted. 
  We 
  must 
  consider 
  the 
  crab 
  with 
  

   its 
  forest 
  of 
  bell 
  aninuilcules 
  in 
  still 
  another 
  light. 
  Since 
  

   the 
  animalcules 
  are 
  well 
  fed 
  in 
  thei]- 
  strange 
  positicm, 
  it 
  

   is 
  but 
  natural 
  to 
  suppose 
  that 
  they 
  would 
  propagate 
  ra- 
  

   pidly. 
  They 
  multiply 
  in 
  tw(» 
  ways, 
  viz. 
  : 
  by 
  dividing 
  

   both 
  lengtliAvise 
  and 
  crosswise, 
  one 
  half 
  of 
  the 
  product 
  

   being 
  set 
  free, 
  and 
  known 
  as 
  swarmers. 
  These 
  cast 
  off 
  

   germs 
  of 
  the 
  animalcule 
  colonies 
  are 
  no 
  doubt 
  huriied 
  

   along 
  in 
  the 
  vortex 
  created 
  by 
  the 
  cilia 
  of 
  the 
  gills 
  and 
  

   palps, 
  carried 
  to 
  the 
  mouth 
  and 
  swallowed 
  as 
  part 
  of 
  the 
  

   daily 
  allowance 
  of 
  the 
  food 
  of 
  the 
  oyster. 
  We 
  are 
  ac- 
  

   cordingly 
  ol)liged 
  to 
  look 
  upon 
  the 
  P'i)iii()tlier<'s 
  in 
  this 
  

   case 
  as 
  a 
  veritable 
  nursery, 
  upon 
  wliose 
  body 
  animalcules 
  

   are 
  continually 
  propagated 
  and 
  set 
  free 
  as 
  pait 
  of 
  the 
  

   food 
  supply 
  of 
  the 
  oyster 
  acting 
  as 
  host 
  to 
  the 
  crab. 
  I 
  

   do 
  not 
  sui)pf>se. 
  however, 
  that 
  such 
  a 
  condition 
  will 
  

   always 
  be 
  found 
  to 
  obtain, 
  and 
  it 
  luust 
  also 
  be 
  icmem- 
  

   bered 
  that 
  myriads 
  of 
  Z(h)tJt<n/t/ilum 
  colonies 
  were 
  

   dredged 
  uj) 
  on 
  algae 
  from 
  the 
  bottom 
  in 
  the 
  immediate 
  

   vicinity. 
  Such 
  an 
  abundance 
  of 
  germs 
  in 
  rlie 
  water 
  

   would 
  favor 
  their 
  being 
  readily 
  transplanted 
  or 
  fixed 
  to 
  

   the 
  body 
  of 
  the 
  oyster-crab. 
  

  

  