﻿GEOWTH 
  AND 
  MIGRATION 
  OF 
  FRESH-WATER 
  MUSSELS. 
  

  

  11 
  

  

  The 
  foregoing 
  tables 
  relate 
  to 
  Unionidse 
  from 
  lot 
  D 
  (p. 
  8) 
  that 
  

   were 
  planted 
  June 
  15 
  and 
  16, 
  1910, 
  and 
  reclamied 
  June 
  15 
  and 
  16, 
  

   1911. 
  In 
  the 
  figures 
  given, 
  the 
  first 
  series 
  under 
  each 
  number 
  is 
  the 
  

   initial 
  record, 
  the 
  second 
  series 
  the 
  record 
  a 
  year 
  later. 
  These 
  

   specimens 
  show 
  manner 
  and 
  extent 
  of 
  growth 
  in 
  one 
  year's 
  time 
  for 
  

   four 
  species. 
  They 
  were 
  killed 
  at 
  the 
  time 
  of 
  reclaiming, 
  and 
  are 
  

   preserved 
  for 
  future 
  study 
  should 
  anyone 
  wish 
  to 
  examme 
  them. 
  

   It 
  can 
  be 
  seen 
  at 
  a 
  glance 
  that 
  undulata 
  (three-ridge) 
  and 
  lachrymosa 
  

   (maple-leaf) 
  are 
  rapid 
  growers 
  in 
  comparison 
  with 
  pustulosa 
  (warty- 
  

   back, 
  pimple-back) 
  and 
  ruhiginosa. 
  Further 
  averages 
  and 
  per- 
  

   centages 
  are 
  worked 
  out 
  for 
  each 
  species 
  listed 
  in 
  table 
  1 
  and 
  later 
  

   tables 
  on 
  page 
  8. 
  

  

  Table 
  2. 
  — 
  Two 
  Periods 
  of 
  Growth, 
  of 
  One 
  Year 
  and 
  op 
  Three 
  Months, 
  

   Respectively, 
  in 
  Specimens 
  Taken 
  prom 
  Lot 
  D. 
  

  

  [Note. 
  — 
  Starred 
  numbers 
  represent 
  specimens 
  shown 
  in 
  plate 
  figures.] 
  

  

  Speci 
  

   men 
  

   No. 
  

  

  165 
  

   146 
  

  

  168 
  

   283 
  

  

  317 
  

   329 
  

   306 
  

   171 
  

   166 
  

   307 
  

   322 
  

   163 
  

   374 
  

  

  363 
  

  

  384 
  

  

  377 
  

  

  358 
  

  

  355* 
  

  

  371 
  

  

  Species. 
  

  

  Q. 
  lachrymosa 
  (ma- 
  

   ple-leaf) 
  

  

  do 
  

  

  ....do 
  

  

  ....do 
  

  

  Q. 
  undulata 
  (three- 
  

   ridge) 
  , 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  , 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  

  

  Q. 
  pustulosa 
  (war- 
  

   ty-back, 
  pimple- 
  

   back) 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  

  

  ....do 
  

  

  Q. 
  rubiginosaa 
  

  

  — 
  do 
  

  

  Weight. 
  

  

  June, 
  

   1910. 
  

  

  Gms. 
  

  

  92.5 
  

   152 
  

   164 
  

   166 
  

  

  95 
  

   120 
  

   125 
  

   140 
  

   145 
  

   166 
  

   183 
  

   185.5 
  

   200 
  

  

  June 
  

   1911. 
  

  

  Gms. 
  

   124 
  

   182 
  

   216 
  

   186 
  

  

  132 
  

   147 
  

   149 
  

   164 
  

   175 
  

   192 
  

   217 
  

   207 
  

   226 
  

  

  45 
  

   73 
  

   102 
  

   107 
  

   145 
  

   75 
  

   97 
  

  

  Sept. 
  

   1911. 
  

  

  Got.?. 
  

   142 
  

   194 
  

   237 
  

   197 
  

  

  150 
  

   162 
  

   159 
  

   176 
  

   190 
  

   214 
  

   230 
  

   220 
  

   236 
  

  

  50 
  

   80 
  

   112 
  

   114 
  

   152 
  

   84 
  

   104 
  

  

  Length. 
  

  

  June, 
  

   1910. 
  

  

  Mm. 
  

   70 
  

   93 
  

  

  82 
  

   93 
  

  

  72 
  

   83 
  

   85 
  

   90 
  

   88 
  

   92 
  

   98 
  

   93 
  

  

  June 
  

   1911. 
  

  

  Mm. 
  

   76 
  

   96 
  

   89 
  

   96 
  

  

  83 
  

  

  96 
  

   94 
  

   97 
  

   102 
  

  

  Sept. 
  

   1911. 
  

  

  Mm. 
  

   81 
  

   97 
  

   94 
  

  

  92 
  

  

  90 
  

   100 
  

  

  97 
  

   102 
  

   105 
  

  

  99 
  

   104.5 
  

  

  57 
  

  

  59.5 
  

  

  66 
  

  

  85 
  

  

  90 
  

  

  70 
  

  

  80 
  

  

  Height. 
  

  

  June, 
  

   1910, 
  

  

  Mm. 
  

   57 
  

  

  57 
  

  

  June 
  

   1911. 
  

  

  Mm. 
  

   63 
  

   61 
  

  

  70 
  

   61 
  

  

  51 
  

   56 
  

   60 
  

   60 
  

   55 
  

  

  Sept. 
  

   1911. 
  

  

  Mm. 
  

  

  66.5 
  

  

  63 
  

  

  72 
  

  

  63 
  

  

  56 
  

   61 
  

   62 
  

   62 
  

   58 
  

  

  Breadth. 
  

  

  June, 
  

   1910. 
  

  

  June, 
  

   1911 
  

  

  Mm. 
  

   32 
  

   37 
  

   41 
  

   37 
  

  

  34 
  

   34 
  

   34 
  

   35 
  

   37 
  

   38 
  

   35 
  

   41 
  

   42 
  

  

  3rm. 
  

   36 
  

   39 
  

   43. 
  5 
  

   39 
  

  

  38 
  

   37 
  

   37 
  

   37 
  

   39 
  

   40 
  

   37 
  

   42 
  

   43 
  

  

  Sept., 
  

   1911. 
  

  

  Mm. 
  

   37.5 
  

   40 
  

   45 
  

   40 
  

  

  39 
  

  

  38 
  

  

  38 
  

  

  38 
  

  

  39.5 
  

  

  41 
  

  

  38 
  

  

  42.5 
  

  

  44 
  

  

  27 
  

  

  32 
  

  

  36.5 
  

  

  33 
  

  

  35.5 
  

  

  31 
  

  

  33 
  

  

  a 
  It 
  should 
  be 
  noted 
  that 
  five 
  of 
  the 
  specimens 
  for 
  the 
  two 
  last 
  species 
  were 
  more 
  nearly 
  mature 
  for 
  these 
  

   species 
  than 
  the 
  specimens 
  of 
  undulata 
  (three-ridge) 
  and 
  lachrymosa 
  (maple-leaf). 
  

  

  The 
  specimens 
  shown 
  in 
  the 
  preceding 
  table 
  were 
  planted 
  June 
  15 
  

   and 
  16, 
  1910, 
  and 
  were 
  reclaimed 
  June 
  15 
  and 
  16, 
  1911, 
  put 
  back 
  in 
  

   the 
  stream, 
  and 
  reclaimed 
  September 
  9, 
  1911. 
  All 
  of 
  the 
  specimens 
  

   of 
  lot 
  D 
  that 
  were 
  reclaimed 
  twice, 
  measured, 
  and 
  weighed, 
  are 
  

   shown 
  in 
  table 
  2. 
  

  

  In 
  the 
  figures 
  given 
  above, 
  the 
  first 
  is 
  the 
  initial 
  record, 
  the 
  second 
  

   the 
  record 
  one 
  year 
  later, 
  and 
  the 
  third 
  a 
  three 
  months' 
  surmner 
  

   record 
  (June 
  15 
  and 
  16 
  to 
  Sept. 
  9, 
  1911). 
  

  

  Table 
  2 
  simply 
  adds 
  to 
  the 
  data 
  of 
  table 
  1 
  in 
  regard 
  to 
  annual 
  

   growth, 
  growth 
  of 
  species, 
  etc. 
  It 
  adds 
  the 
  fact 
  of 
  seasonal 
  growth^ 
  

  

  