﻿LOBSTER 
  AND 
  CLAM 
  IN 
  Vi:STIGATIONS. 
  187 
  

  

  Licmojyhora 
  tincta 
  Gnuwio. 
  — 
  Of 
  all 
  the 
  species 
  found 
  on 
  the 
  lobster 
  

   fry 
  the 
  most 
  abundant 
  is 
  Licrnophora 
  tincta 
  Grunovv. 
  This 
  form 
  was 
  

   found 
  on 
  everj^ 
  fry 
  examined, 
  and 
  in 
  most 
  cases 
  constituted 
  over 
  90 
  per 
  

   cent 
  of 
  all 
  the 
  growth 
  present. 
  It 
  is 
  also 
  abundant, 
  as 
  we 
  have 
  already 
  

   seen, 
  in 
  the 
  water 
  and 
  on 
  submerged 
  objects 
  generally. 
  It 
  seems 
  to 
  be 
  

   particularly 
  adapted 
  for 
  lodgment 
  and 
  growth 
  on 
  young 
  Crustacea 
  of 
  

   various 
  sorts, 
  however, 
  especially 
  when 
  they 
  are 
  kept 
  in 
  continement. 
  

   The 
  species 
  occurs 
  only 
  in 
  salt 
  water, 
  and 
  though 
  the 
  genus 
  was 
  named 
  

   by 
  C. 
  Agardh 
  as 
  early 
  as 
  1827 
  and 
  the 
  species 
  by 
  A. 
  Grunow 
  some 
  

   time 
  later, 
  yet 
  it 
  has 
  appeared 
  under 
  many 
  synonyms. 
  The 
  species 
  

   are 
  in 
  many 
  cases 
  doubtfully 
  distinct, 
  and 
  this 
  may 
  account 
  for 
  the 
  fact 
  

   that 
  the 
  early 
  synonymy 
  is 
  inextricable. 
  Following 
  are 
  some 
  of 
  the 
  

   names: 
  

  

  Uomphonema 
  tinctuni 
  Agardh. 
  

   Riphidophora 
  elongata 
  Kiitzing. 
  

   Riphidophora 
  oceanica 
  Kiitzing. 
  

   Riphidophora 
  superba 
  Kiitzing. 
  

   Riphidophora 
  meneghiniana 
  Kiitzing. 
  

   Podosphenia 
  hyalina 
  Kiitzing. 
  

   Podosphenia 
  ft 
  Kiitzing. 
  

   Podosphenia 
  racemosa 
  Kiitzing. 
  

  

  In 
  shape 
  the 
  f 
  rustules 
  are 
  more 
  or 
  less 
  cuneiform 
  in 
  front 
  view, 
  con- 
  

   vex 
  in 
  side 
  view, 
  inflected 
  at 
  the 
  larger 
  end. 
  They 
  show 
  transverse 
  

   stride 
  ranging 
  from 
  27-28 
  per 
  0.01 
  mm. 
  at 
  the 
  base 
  to 
  30-31 
  at 
  the 
  

   center 
  and 
  33 
  or 
  more 
  at 
  the 
  top. 
  A 
  pseudoraphe 
  is 
  easily 
  apparent. 
  

   The 
  endochrome 
  is 
  arranged 
  in 
  a 
  radiating 
  manner 
  about 
  the 
  nucleus 
  

   and 
  cytoplasm 
  in 
  the 
  center 
  of 
  the 
  frustule, 
  or 
  ma}' 
  appear 
  as 
  regular 
  

   oval 
  granules 
  scattered 
  throughout 
  the 
  frustule. 
  The 
  frustules 
  are 
  

   mounted 
  on 
  a 
  gelatinous 
  stalk, 
  at 
  first 
  represented 
  by 
  a 
  simple 
  knob 
  

   at 
  the 
  end 
  of 
  the 
  cell, 
  but 
  this 
  later 
  grows 
  out 
  into 
  a 
  stalk 
  which 
  divides 
  

   dichotomously 
  as 
  the 
  cells 
  divide, 
  and 
  finall}'' 
  forms 
  a 
  much 
  branched 
  

   stipes 
  of 
  considerable 
  length 
  and 
  complexity. 
  (PI. 
  iv, 
  fig. 
  1.) 
  

  

  What 
  were 
  taken 
  to 
  be 
  auxospores 
  were 
  observed 
  in 
  one 
  or 
  two 
  

   instances 
  (pi. 
  iv, 
  fig. 
  2), 
  but 
  no 
  evidence 
  of 
  other 
  spore 
  formation, 
  

   either 
  swarm 
  or 
  resting 
  spores, 
  was 
  seen, 
  nor 
  any 
  evidence 
  of 
  con- 
  

   jugation. 
  

  

  OTHER 
  GROWTHS 
  FOUND 
  ON 
  LOBSTER 
  FRY. 
  

  

  Algpe. 
  — 
  Although 
  diatoms 
  are 
  the 
  first 
  and 
  most 
  abundant 
  organ- 
  

   isms 
  that 
  appear 
  on 
  lobster 
  fr}', 
  they 
  are 
  by 
  no 
  means 
  the 
  only 
  ones. 
  

   On 
  both 
  Woods 
  Hole 
  and 
  Wickford 
  fry 
  filaments 
  of 
  a 
  green 
  alga 
  are 
  

   frequently 
  seen. 
  This 
  occurs 
  principally 
  on 
  the 
  fry 
  of 
  the 
  first, 
  sec- 
  

   ond, 
  or 
  third 
  stage, 
  but 
  individuals 
  of 
  the 
  fourth 
  stage 
  have 
  been 
  

   observed 
  with 
  very 
  abundant 
  algal 
  growths. 
  

  

  