﻿284 
  Transactions.-'^Zoology. 
  

  

  The 
  following 
  two 
  specimens 
  described 
  are 
  the 
  stuffed 
  ones 
  in 
  the 
  Otago 
  

   Museum 
  already 
  referred 
  to 
  under 
  the 
  heading 
  Distribution 
  and 
  Growth 
  of 
  

   Trout, 
  and 
  the 
  natural 
  colours 
  of 
  which 
  cannot 
  now 
  be 
  given. 
  

  

  i.' 
  — 
  Male 
  trout 
  taken 
  in 
  Shag 
  River, 
  June, 
  1874. 
  Present 
  colour 
  brown 
  

   on 
  back 
  and 
  dark 
  grey 
  on 
  sides 
  ; 
  head 
  large 
  ; 
  mandible 
  terminating 
  in 
  very 
  

   long 
  hook 
  ; 
  tail 
  square 
  ; 
  black 
  spots 
  numerous. 
  

  

  Dimensiom 
  : 
  Weight, 
  141bs. 
  ; 
  length, 
  29|rin. 
  ; 
  depth, 
  7in. 
  ; 
  head, 
  7in, 
  

  

  Fin 
  Rays 
  : 
  D.IO, 
  P.13, 
  V.9, 
  A.IO, 
  C.19. 
  

  

  Scales: 
  15 
  in 
  transverse 
  row 
  from 
  adipose 
  fin 
  back 
  to 
  lateral 
  line. 
  

  

  j. 
  — 
  Female 
  trout, 
  taken 
  in 
  Shag 
  Eiver, 
  July, 
  1874. 
  Present 
  colour 
  brown 
  

   on 
  back 
  and 
  dark 
  grey 
  on 
  sides 
  ; 
  head 
  short 
  and 
  blunt 
  ; 
  tail 
  square 
  ; 
  black 
  

   spots 
  plentiful 
  but 
  not 
  numerous. 
  

  

  Dimensions 
  : 
  Weight, 
  16|^lbs. 
  ; 
  length, 
  29-§in. 
  ; 
  depth, 
  6f 
  in. 
  ; 
  head, 
  S^in. 
  ; 
  

  

  Fin 
  Rays: 
  D.ll, 
  P.13, 
  V.9, 
  A.IO, 
  C.19. 
  Scales: 
  16 
  in 
  transverse 
  row 
  

   from 
  adipose 
  fin 
  backwards 
  to 
  lateral 
  line. 
  

  

  Collecting 
  now 
  the 
  results 
  together 
  of 
  my 
  examination 
  of 
  the 
  various 
  

   specimens 
  above 
  detailed, 
  I 
  find, 
  that 
  as 
  regards 
  the 
  colour 
  and 
  spots, 
  

   these 
  vary 
  in 
  the 
  different 
  rivers 
  from 
  which 
  the 
  respective 
  individuals 
  

   were 
  taken. 
  The 
  Shag 
  Eiver 
  fish 
  are 
  all 
  silvery, 
  and, 
  as 
  a 
  rule, 
  have 
  

   numerous 
  black 
  spots, 
  red 
  spots 
  awanting 
  or 
  rare. 
  The 
  other 
  trout, 
  furthest 
  

   removed 
  in 
  appearance 
  from 
  these, 
  are 
  those 
  of 
  the 
  Lee 
  and 
  Deep 
  Streams, 
  

   which 
  are 
  golden 
  on 
  the 
  sides 
  ; 
  in 
  the 
  males 
  black 
  spots 
  numerous 
  ; 
  the 
  

   females 
  are 
  mostly 
  silvery, 
  the 
  spots 
  being 
  less 
  j)lentiful, 
  and 
  both 
  have 
  red 
  

   spots, 
  the 
  male 
  most. 
  The 
  fin 
  rays 
  vary 
  more 
  or 
  less; 
  they 
  are 
  in 
  the 
  

   specimens 
  examined 
  by 
  me 
  dorsal, 
  10 
  to 
  13 
  ; 
  pectoral, 
  12 
  to 
  14 
  ; 
  V. 
  9 
  to 
  

   10, 
  A.IO 
  to 
  12, 
  C.19. 
  Of 
  these, 
  the 
  most 
  constant 
  is 
  the 
  caudal 
  fin, 
  which 
  

   never 
  seems 
  to 
  vary 
  from 
  19, 
  In 
  two 
  specimens 
  where 
  I 
  found 
  more 
  than 
  

   this 
  number, 
  I 
  am 
  inclined 
  to 
  think 
  I 
  must 
  have 
  made 
  a 
  mistake 
  in 
  

   counting 
  them. 
  Next 
  in 
  invariability 
  are 
  the 
  ventrals 
  ; 
  seven 
  individuals 
  I 
  

   found 
  had 
  each 
  9 
  rays 
  in 
  these 
  fins, 
  and 
  only 
  one 
  had 
  10. 
  The 
  anal 
  fin 
  

   rays 
  are 
  tolerably 
  constant, 
  but 
  the 
  pectoral 
  and 
  dorsal 
  fins 
  vary 
  a 
  good 
  

   deal. 
  

  

  The 
  scales 
  I 
  found, 
  reckoning 
  from 
  the 
  adipose 
  fin 
  backwards 
  to 
  the 
  

   lateral 
  line, 
  to 
  range 
  from 
  14 
  to 
  17, 
  and 
  the 
  pyloric 
  caeca 
  from 
  43 
  to 
  54.* 
  

   Now, 
  if 
  we 
  compare 
  these 
  results 
  with 
  the 
  numbers 
  given 
  by 
  three 
  

   authorities, 
  Giiuther, 
  Hamilton, 
  and 
  Yarrell, 
  we 
  find 
  they 
  give 
  the 
  

   following 
  :—D. 
  13 
  to 
  14, 
  P.14., 
  V.9., 
  A.ll 
  to 
  12, 
  C.19, 
  scales 
  15, 
  and 
  

   pyloric 
  cffica, 
  33 
  to 
  46. 
  That 
  is, 
  with 
  the 
  exception 
  of 
  the 
  ventral 
  and 
  

   caudal 
  fins, 
  a 
  higher 
  number 
  of 
  fin 
  rays 
  than 
  I 
  find; 
  scales 
  fewer 
  in 
  a 
  

  

  * 
  The 
  head 
  of 
  vomer 
  carries 
  2 
  to 
  4 
  teeth, 
  and 
  body 
  of 
  vomer 
  teeth 
  all 
  the 
  way. 
  

   Palatines, 
  tongue, 
  and 
  mandible 
  all 
  armed 
  with 
  teeth. 
  

  

  