﻿442 
  REPORT 
  OF 
  COMMISSIONER 
  OP 
  PISH 
  AND 
  FISHERIES. 
  [16 
  J 
  

  

  ccena, 
  these 
  arteries 
  are 
  probably 
  accompanied 
  by 
  veins, 
  which, 
  run 
  par- 
  

   allel 
  with 
  the 
  arteries 
  of 
  the 
  flukes. 
  In 
  Globioccphalus, 
  according 
  to 
  

   Mnrie's 
  figure, 
  this 
  principal 
  vessel 
  gives 
  oft' 
  lateral 
  branches 
  nearer 
  its 
  

   origin 
  than 
  in 
  Phoccuna, 
  and 
  its 
  proximal 
  end 
  is 
  turned 
  forward 
  as 
  though 
  

   connected 
  laterally 
  or 
  at 
  the 
  side 
  of 
  the 
  vertebree 
  of 
  the 
  tail 
  with 
  

   branches 
  given 
  oft' 
  by 
  the 
  median 
  inferior 
  caudal 
  continuation 
  of 
  the 
  

   aorta. 
  

  

  In 
  the 
  memoir 
  cited 
  above 
  (p. 
  269) 
  Muriealso 
  disputes 
  the 
  conclusion 
  

   of 
  Hunter 
  and 
  others 
  that 
  the 
  abdominal 
  aorta 
  does 
  not 
  send 
  off 
  any 
  

   external 
  iliac 
  branches. 
  The 
  arrangement 
  which 
  he 
  described 
  in 
  the 
  

   female 
  Globiocephalus 
  seems 
  to 
  be 
  similar 
  to 
  that 
  found 
  in 
  Phoccena. 
  

   The 
  common 
  iliac 
  after 
  giving 
  off 
  the 
  hypogastric 
  divided 
  into 
  what 
  he 
  

   regarded 
  as 
  external 
  and 
  internal 
  iliac 
  arteries. 
  The 
  external, 
  imme- 
  

   diately 
  beyond 
  its 
  origin, 
  split 
  and 
  sent 
  rami 
  to 
  the 
  parietes 
  of 
  the 
  abdo- 
  

   men 
  and 
  genital 
  parts. 
  Its 
  other 
  main 
  branch 
  passed 
  beneath 
  the 
  os 
  in- 
  

   nominatum 
  and 
  interpelvic 
  facia 
  or 
  ligaments 
  and 
  there 
  broke 
  up 
  into 
  

   several 
  diminutive 
  channels; 
  some 
  of 
  these 
  were 
  distributed 
  to 
  the 
  

   pubo 
  and 
  ilio-coccygeus 
  muscle 
  ; 
  others 
  with 
  a 
  nerve 
  pierced 
  the 
  inter- 
  

   pelvic 
  fascia 
  at 
  the 
  notch, 
  just 
  behind 
  the 
  anterior 
  capitulum 
  of 
  the 
  bone. 
  

   Beyond 
  this, 
  in 
  consequence 
  of 
  the 
  complete 
  atrophy 
  of 
  the 
  functional 
  

   parts 
  of 
  the 
  limb, 
  viz: 
  femur, 
  tibia, 
  bones 
  of 
  the 
  pes 
  and 
  the 
  muscles 
  

   which 
  actuate 
  them, 
  one 
  would 
  not 
  expect 
  to 
  trace 
  these 
  vessels 
  so 
  that 
  

   the 
  flukes 
  would 
  seem 
  to 
  get 
  their 
  blood 
  supply 
  from 
  another 
  source 
  

   through 
  secondary 
  adaptation, 
  as 
  has 
  in 
  fact 
  been 
  already 
  stated. 
  

  

  (9) 
  The 
  digits 
  of 
  pinnipeds 
  and 
  cetaceans. 
  — 
  As 
  in 
  the 
  seals 
  the 
  digits 
  of 
  

   the 
  man 
  us 
  of 
  Cetaceans 
  diminish 
  in 
  length 
  from 
  within 
  outward, 
  that 
  

   is, 
  from 
  the 
  second 
  to 
  the 
  fifth, 
  the 
  first 
  digit 
  or 
  that 
  corresponding 
  to 
  

   the 
  thumb 
  being 
  anterior 
  and 
  exterior, 
  so 
  that 
  the 
  fore 
  limb 
  is 
  perma- 
  

   nently 
  prone 
  and 
  is 
  rotated 
  backwards, 
  as 
  are 
  the 
  hind 
  limbs 
  of 
  the 
  

   former. 
  There 
  is, 
  however, 
  an 
  even 
  more 
  interesting 
  correspondence 
  

   between 
  the 
  form 
  and 
  structure 
  of 
  the 
  fore 
  limb 
  and 
  the 
  flukes, 
  as 
  seen 
  

   in 
  Phoca'na, 
  in 
  which 
  the 
  layer 
  of 
  blubber 
  extends 
  out 
  under 
  the 
  skin 
  

   investing 
  the 
  manus 
  for 
  something 
  more 
  than 
  one-half 
  of 
  its 
  length 
  

   from 
  the 
  base 
  outwards. 
  In 
  the 
  flukes, 
  on 
  the 
  other 
  hand, 
  no 
  blubber 
  is 
  

   found 
  ; 
  in 
  fact, 
  the 
  layer 
  of 
  fatty 
  tissue 
  bearing 
  that 
  name 
  does 
  not 
  ex- 
  

   tend 
  even 
  as 
  far 
  as 
  their 
  anterior 
  borders, 
  ceasing 
  beneath 
  the 
  integu- 
  

   ment 
  covering 
  the 
  caudal 
  peduncle, 
  considerably 
  in 
  advance 
  of 
  the 
  

   flukes. 
  

  

  The 
  subdermal 
  coating 
  of 
  blubber 
  which 
  invests 
  the 
  fore 
  limb 
  is 
  in- 
  

   terposed 
  between 
  the 
  degenerate 
  tendons 
  of 
  the 
  finger 
  muscles 
  and 
  the 
  

   skin, 
  whereas 
  in 
  the 
  hind 
  feet 
  or 
  flukes 
  the 
  superficial 
  stratum 
  of 
  longi- 
  

   tudinal 
  tendon-like 
  bundles 
  of 
  fibers 
  lie 
  immediately 
  under 
  the 
  integu- 
  

   ment. 
  These 
  superficial 
  tendinous 
  bundles 
  in 
  the 
  flukes 
  I 
  have 
  else- 
  

   where 
  spoken 
  of 
  as 
  possibly 
  representing 
  the 
  degenerate 
  system 
  of 
  the 
  

   flexor 
  and 
  extensor 
  tendons 
  of 
  the 
  pes, 
  though 
  I 
  am 
  aware 
  that 
  a 
  simi- 
  

   lar 
  arrangement 
  is 
  found 
  in 
  the 
  dorsal 
  tin 
  when 
  it 
  is 
  developed, 
  in 
  which 
  

  

  