﻿various 
  Soul 
  h- 
  American 
  lifammals. 
  353 
  

  

  Measurements 
  of 
  five 
  skulls 
  of 
  tlie 
  two 
  species 
  {two 
  of 
  

   these 
  kindly 
  placed 
  at 
  my 
  disposal 
  by 
  the 
  authorities 
  of 
  the 
  

   lioyal 
  College 
  of 
  Surgeons) 
  : 
  — 
  

  

  Dusicyon 
  antarcticus. 
  D. 
  danvini, 
  

  

  K.U.S, 
  B.M. 
  B.M. 
  B.M. 
  R.C.S. 
  

  

  635. 
  69.2.24.3. 
  37.3.15.48. 
  37.3.15.47. 
  636. 
  

  

  (1'ype.) 
  

  

  Greatest 
  length 
  166 
  164 
  158 
  18I 
  175 
  

  

  Condvlo-basallengtli 
  . 
  . 
  . 
  . 
  . 
  . 
  1G4 
  162 
  155-5 
  (c.) 
  177 
  171 
  

  

  Zyjjoiiiatic 
  breadth 
  94 
  91 
  87 
  98 
  

  

  Length 
  of 
  nasals 
  (middle 
  line). 
  53 
  57 
  51 
  .. 
  55 
  

  

  1 
  11 
  terorbital 
  breadth 
  30 
  285 
  27 
  36 
  33-5 
  

  

  Breadth 
  of 
  brain-case 
  52-2 
  61-5 
  51 
  54 
  53 
  

  

  l^readth 
  of 
  muzzle 
  28 
  29 
  28 
  35 
  31 
  

  

  I'alatal 
  length 
  80 
  85-6 
  83 
  95 
  91 
  

  

  Length 
  of 
  j(>3 
  11-2 
  11 
  10-3 
  117 
  11 
  

  

  Length 
  of 
  ;j^ 
  17-2 
  18 
  17-5 
  18-5 
  20 
  

  

  Length 
  of 
  ?«^ 
  and 
  Jrr 
  combined. 
  17"3 
  17'5 
  18 
  19"8 
  20 
  

   G 
  reatest 
  diameter 
  of 
  extracted 
  

  

  canine 
  97 
  95 
  8'5 
  107 
  9-9 
  

  

  Bah. 
  East 
  Falkland 
  Island. 
  

  

  Type. 
  Adult 
  male. 
  B.M. 
  no. 
  37. 
  3. 
  15. 
  47. 
  Collected 
  

   during 
  the 
  voyages 
  of 
  the 
  ' 
  Adventure 
  ' 
  and 
  * 
  Beagle,' 
  and 
  

   ])resented 
  by 
  Sir 
  V^ 
  . 
  Burnett 
  and 
  Admiral 
  Fitzroy. 
  

  

  It 
  is 
  a 
  matter 
  of 
  extreme 
  interest 
  to 
  find 
  that 
  there 
  are 
  two 
  

   distinct 
  insular 
  forms 
  of 
  the 
  now 
  extinct 
  " 
  Antarctic 
  Wolf," 
  

   inhabiting 
  respectively 
  the 
  East 
  and 
  West 
  Falkland 
  Islands. 
  

  

  First, 
  may 
  be 
  quoted 
  Darwin's 
  account, 
  published 
  in 
  the 
  

   Zoology 
  of 
  the 
  "Voyage 
  of 
  the 
  'Beagle'" 
  ('' 
  Mammalia," 
  

   p. 
  10), 
  which 
  already 
  indicated 
  this 
  distinction 
  as 
  long 
  ago 
  

   as 
  1838 
  : 
  — 
  " 
  I 
  was 
  assured 
  by 
  Mr. 
  Low, 
  an 
  intelligent 
  sealer, 
  

   who 
  has 
  long 
  frequented 
  these 
  islands, 
  that 
  the 
  wolves 
  of 
  

   West 
  Falkland 
  are 
  invariably 
  smaller 
  and 
  of 
  a 
  redder 
  colour 
  

   than 
  those 
  from 
  the 
  Eastern 
  island 
  ; 
  and 
  this 
  account 
  was 
  

   corroborated 
  by 
  the 
  officers 
  of 
  the 
  * 
  Adventure,' 
  employed 
  in 
  

   surveying 
  the 
  archipelago." 
  

  

  [Tliis 
  asserted 
  difference 
  is 
  explained 
  in 
  Mr. 
  Rupert 
  

   Vallentin's 
  interesting 
  account 
  of 
  the 
  Falkland 
  faumi 
  f 
  as 
  

   being 
  due 
  to 
  age; 
  but, 
  as 
  no 
  question 
  of 
  age 
  comes 
  in 
  in 
  the 
  

   distinction 
  of 
  the 
  skulls 
  — 
  all 
  being 
  fully 
  adult, 
  — 
  we 
  may 
  con- 
  

   clude 
  that 
  the 
  opinion 
  given 
  by 
  Mr. 
  Vallentin's 
  informant 
  

   was 
  mistaken.] 
  

  

  * 
  Sex-marks 
  placed 
  in 
  brackets 
  indicate 
  that 
  these 
  are 
  presumed 
  from 
  

   the 
  size 
  of 
  the 
  canines. 
  A 
  male 
  canine 
  is 
  approximately 
  a 
  millimetre 
  

   more 
  in 
  diameter 
  than 
  a 
  female 
  one, 
  the 
  measurements 
  being 
  taken 
  at 
  

   the 
  thickest 
  part 
  of 
  the 
  tooth, 
  wlien 
  extracted 
  from 
  the 
  skull. 
  

  

  t 
  Mem. 
  Manchester 
  Soc. 
  xlviii. 
  mem. 
  23, 
  p. 
  45 
  (1904), 
  

  

  