﻿02 
  

  

  July, 
  wliile 
  tlie 
  shell 
  bears 
  every 
  mark 
  to 
  indicate 
  that 
  

   it 
  probably 
  is 
  of 
  one 
  season's 
  growth, 
  l)eing 
  spawned 
  in 
  

   the 
  early 
  ])art 
  of 
  the 
  lireeding 
  term. 
  

  

  It 
  will 
  be 
  noticed 
  that 
  all 
  except 
  Fig. 
  It? 
  are 
  hand- 
  

   somely 
  rounded 
  in 
  shape 
  not 
  unlike 
  a 
  scallop 
  in 
  form, 
  

   which 
  they 
  simulate 
  still 
  more 
  by 
  the 
  lobes 
  which 
  they 
  

   develo}) 
  on 
  the 
  shell 
  on 
  either 
  side 
  of 
  the 
  hinge. 
  Bands 
  

   of 
  a 
  purplish 
  color 
  also 
  radiate 
  from 
  the 
  hinge, 
  widening 
  

   towards 
  the 
  margin 
  of 
  tlie 
  valves, 
  giving 
  the 
  S])at 
  a 
  very 
  

   much 
  more 
  handsome 
  appearance 
  than 
  the 
  adult, 
  from 
  

   which 
  it 
  differs 
  also 
  in 
  having 
  an 
  extremely 
  thin 
  shell 
  

   which 
  is 
  easily 
  crushed 
  or 
  broken. 
  The 
  rounded 
  forms 
  

   were 
  taken 
  from 
  the 
  fiat 
  surfaces 
  of 
  the 
  slate 
  collectors, 
  

   though 
  Fig. 
  18. 
  the 
  only 
  one 
  noticed 
  which 
  exhibited 
  a 
  

   tendency 
  to 
  elongate 
  like 
  the 
  adult, 
  was 
  taken 
  from 
  a 
  

   similar 
  surface. 
  If 
  the 
  fry 
  happens 
  to 
  fix 
  itself 
  to 
  a 
  

   roughened 
  surface 
  or 
  in 
  an 
  angle 
  it 
  will 
  adapt 
  itself 
  to 
  

   the 
  shape 
  of 
  the 
  nidus 
  which 
  it 
  has 
  chosen. 
  In 
  one 
  case 
  

   I 
  found 
  a 
  small 
  oyster 
  about 
  a 
  fourth 
  of 
  an 
  inch 
  in 
  diam- 
  

   eter 
  attached 
  to 
  the 
  outside 
  of 
  the 
  plicated 
  shell 
  of 
  a 
  

   Mofliolaria, 
  and 
  was 
  sui'])rised 
  to 
  notice 
  that 
  in 
  growing 
  

   and 
  adapting 
  itself 
  to 
  the 
  wrinkled 
  surface 
  of 
  its 
  host 
  it 
  

   had 
  reproduced 
  in 
  both 
  valves 
  all 
  the 
  folds 
  on 
  the 
  out- 
  

   side 
  of 
  the 
  former. 
  I 
  also 
  found 
  a 
  specimen 
  whicli 
  had 
  

   fixed 
  itself 
  to 
  a 
  dead 
  sponge. 
  

  

  ISrU.MBKK 
  OF 
  SPAT 
  WIITCII 
  FFX 
  TflKMSKLYES 
  Tf> 
  K 
  SIX(ILE 
  

  

  SI.ATK. 
  

  

  As 
  I 
  have 
  remarked 
  above 
  the 
  most 
  successful 
  collect- 
  

   ing 
  apj)aratus 
  was 
  found 
  to 
  be 
  the 
  slates 
  covered 
  with 
  a 
  

   coating 
  of 
  mortar, 
  but 
  even 
  these 
  did 
  not 
  give 
  the 
  most 
  

   promising 
  results, 
  as 
  the 
  greatest 
  mnuberof 
  spat 
  noticed 
  

   on 
  one 
  slate 
  was 
  8, 
  varying 
  from 
  \ 
  to 
  1 
  inch 
  in 
  diameter. 
  

   This 
  meagerness 
  in 
  the 
  numl)cr 
  of 
  young 
  which 
  fixed 
  

   themselves 
  last 
  summer 
  may 
  have 
  been 
  due 
  to 
  an 
  unfav- 
  

   orable 
  season. 
  The 
  results 
  obtained 
  by 
  ('aptain 
  AVins- 
  

   low 
  as" 
  detailed 
  in 
  the 
  report 
  of 
  this 
  Commission 
  for 
  the 
  

  

  