﻿American 
  Fin-foot. 
  33 
  

  

  drawino^ 
  ended 
  I 
  am 
  unable 
  to 
  say. 
  Evidently, 
  therefore, 
  

   there 
  are 
  differences 
  in 
  respect 
  of 
  this 
  muscle 
  between 
  the 
  

   American 
  and 
  African 
  Fin-foots. 
  

  

  In 
  many 
  birds, 
  for 
  instance 
  in 
  the 
  Duck 
  (see 
  Fiirbringer, 
  

   loc. 
  cit. 
  Taf. 
  XX, 
  fig. 
  4), 
  the 
  biceps 
  slip 
  joins 
  the 
  tendon 
  of 
  the 
  

   tensor 
  patagii 
  longus 
  just 
  at 
  the 
  insertion 
  of 
  the 
  fan-shaped 
  

   tendon 
  which 
  very 
  commonly 
  unites 
  that 
  tendon 
  with 
  the 
  

   tendon 
  of 
  the 
  patagii 
  brevis 
  at 
  its 
  insertion. 
  I 
  am 
  inclined 
  

   to 
  think 
  that 
  the 
  long 
  and 
  delicate 
  tendon 
  connected 
  with 
  

   the 
  biceps 
  slip 
  of 
  Heliornis 
  is 
  the 
  equivalent 
  of 
  that 
  tendon 
  

   which 
  has 
  lost 
  its 
  attachment 
  to 
  the 
  tendon 
  of 
  the 
  tensor 
  

   patagii 
  longus 
  ; 
  if 
  so, 
  then 
  the 
  tendons 
  of 
  the 
  patagium 
  of 
  

   Heliornis 
  are 
  less 
  abnormal 
  than 
  one 
  would 
  otherwise 
  regard 
  

   them. 
  

  

  Latissimus 
  dorsi. 
  — 
  This 
  muscle 
  is 
  composed 
  of 
  the 
  usual 
  

   two 
  parts 
  : 
  the 
  anterior 
  portion 
  is, 
  also 
  as 
  usual, 
  the 
  weaker 
  

   of 
  the 
  two 
  ; 
  it 
  arises 
  from 
  the 
  spines 
  of 
  the 
  dorsal 
  vertebrae 
  ; 
  

   the 
  origin 
  of 
  the 
  posterior 
  half 
  of 
  the 
  muscle 
  follows 
  imme- 
  

   diately 
  upon 
  it 
  ; 
  the 
  posterior 
  half 
  of 
  the 
  latissimus 
  dorsi 
  arises 
  

   also 
  from 
  the 
  front 
  border 
  of 
  the 
  ilium. 
  The 
  anterior 
  half 
  

   of 
  the 
  muscle 
  has 
  a 
  broad 
  tendinous 
  insertion, 
  which 
  com- 
  

   mences 
  just 
  behind 
  the 
  short, 
  flat, 
  and 
  narrow 
  glistening 
  

   tendon 
  by 
  which 
  the 
  posterior 
  half 
  of 
  the 
  muscle 
  is 
  attached 
  

   to 
  the 
  humerus. 
  

  

  Anconeus 
  longus. 
  — 
  This 
  muscle 
  appears 
  to 
  arise 
  and 
  to 
  be 
  

   inserted 
  precisely 
  as 
  in 
  Podica 
  senegalensis. 
  The 
  accessory 
  

   tendon, 
  which 
  is 
  about 
  one 
  half 
  the 
  width 
  of 
  the 
  tendon 
  

   of 
  insertion 
  of 
  the 
  posterior 
  half 
  of 
  the 
  latissimus 
  dorsi, 
  is 
  

   inserted 
  on 
  to 
  the 
  humerus 
  above 
  the 
  latter. 
  

  

  Expansor 
  secundariorum. 
  — 
  In 
  the 
  fact 
  of 
  the 
  presence 
  of 
  

   this 
  muscle 
  the 
  American 
  Fin-foot 
  agrees 
  with 
  the 
  African 
  

   form. 
  The 
  tendon 
  is 
  very 
  thin, 
  though 
  strong 
  ; 
  it 
  increases 
  

   somewhat 
  in 
  thickness 
  as 
  it 
  approaches 
  the 
  teres. 
  

  

  Fedoralis 
  primus. 
  — 
  I 
  could 
  not 
  detect 
  any 
  division 
  of 
  this 
  

   muscle 
  into 
  two 
  layers, 
  such 
  as 
  occurs 
  in 
  many 
  birds, 
  in- 
  

   cluding 
  Podica 
  senegalensis. 
  

  

  T^he 
  pectoralis 
  seciindus 
  extends 
  back 
  in 
  its 
  origin 
  nearly 
  to 
  

   the 
  end 
  of 
  the 
  sternum. 
  

  

  SER. 
  VI. 
  VOL. 
  V. 
  D 
  

  

  