﻿American 
  Fin-foot. 
  35 
  

  

  guishable 
  in 
  the 
  individuals 
  wliicli 
  I 
  dissected 
  ; 
  the 
  origin 
  of 
  

   these 
  two 
  muscles 
  commences 
  exactly 
  at 
  that 
  point 
  Avhere 
  

   the 
  origin 
  of 
  the 
  tensor 
  fasciae 
  leaves 
  off. 
  The 
  insertion 
  of 
  

   the 
  semimembranosus 
  is 
  flat 
  and 
  tendinous 
  ; 
  it 
  lies 
  above 
  

   the 
  insertion 
  of 
  the 
  semitendinosus, 
  which 
  is 
  also 
  flat 
  and 
  

   tendinous; 
  the 
  tendinous 
  insertion 
  of 
  the 
  semitendinosus 
  

   is 
  9 
  mm. 
  across 
  ; 
  it 
  nearly 
  completely 
  overlaps 
  the 
  6 
  mm. 
  

   wide 
  insertion 
  of 
  the 
  semimembranosus, 
  when 
  the 
  thigh 
  is 
  

   examined 
  from 
  the 
  inside. 
  

  

  In 
  Poclica 
  senegalensis 
  these 
  two 
  muscles 
  are 
  inserted 
  one 
  

   above 
  the 
  other, 
  the 
  insertions 
  not 
  overlapping 
  at 
  all, 
  indeed 
  

   not 
  quite 
  meeting. 
  

  

  As 
  is 
  the 
  case 
  with 
  Podica 
  seneg 
  (decisis, 
  Heliornis 
  surinam- 
  

   ensis 
  has 
  no 
  accessory 
  semitendinosus. 
  It 
  has, 
  however, 
  

   like 
  the 
  former 
  bird, 
  both 
  the 
  femoro-caudal 
  and 
  accessory 
  

   femoro-caudal. 
  

  

  There 
  are 
  two 
  adductors 
  and, 
  of 
  course, 
  an 
  ambiens. 
  

  

  The 
  gastrocnemius 
  has 
  a 
  large 
  outer 
  and 
  inner 
  head 
  ; 
  there 
  

   is 
  a 
  very 
  slender 
  middle 
  head 
  ; 
  its 
  tendon 
  is 
  ossified. 
  

  

  The 
  tibialis 
  anticus 
  is 
  partly 
  covered 
  over, 
  as 
  is 
  frequently 
  

   the 
  case, 
  by 
  the 
  peronceus 
  brevis. 
  It 
  has 
  a 
  single 
  insertion, 
  

   and 
  its 
  tendon 
  is 
  ossified 
  up 
  to 
  within 
  1 
  mm. 
  of 
  the 
  ankle- 
  

   joint. 
  Both 
  peroneal 
  muscles 
  are 
  present. 
  

  

  The 
  peronceus 
  brevis, 
  as 
  has 
  already 
  been 
  mentioned, 
  partly 
  

   covers 
  over 
  the 
  tibialis 
  anticus 
  ; 
  its 
  tendon 
  of 
  insertion 
  is 
  at 
  

   first 
  ossified 
  ; 
  it 
  is 
  rather 
  broad, 
  and 
  seems 
  partly, 
  at 
  least, 
  to 
  

   join 
  the 
  tendon 
  of 
  the 
  gastrocnemius 
  at 
  the 
  insertion. 
  

  

  The 
  peronceus 
  longus 
  is 
  also 
  covered 
  by 
  the 
  peroneus 
  brevis 
  ; 
  

   it 
  runs 
  alongside 
  of 
  the 
  tibialis 
  anticus; 
  its 
  tendon 
  is 
  also 
  

   ossified 
  and 
  is 
  inserted 
  in 
  the 
  usual 
  way. 
  

  

  The 
  tendon 
  of 
  the 
  extensor 
  communis 
  digitorum 
  (fig. 
  2, 
  a, 
  

   p. 
  3G) 
  has 
  two 
  separate 
  ossifications, 
  one 
  just 
  at 
  its 
  commence- 
  

   ment, 
  the 
  other 
  along 
  the 
  metatarsus; 
  at 
  the 
  commencement 
  

   of 
  the 
  second 
  ossified 
  tract 
  a 
  branch 
  is 
  given 
  off", 
  which 
  supplies 
  

   the 
  second 
  and 
  third 
  toes 
  ; 
  at 
  the 
  end 
  of 
  the 
  ossified 
  tract 
  

   the 
  tendon 
  divides 
  into 
  two 
  for 
  the 
  third 
  and 
  fourth 
  toes. 
  

  

  The 
  superficial 
  flexor 
  tendons, 
  which 
  are, 
  as 
  usual, 
  seven 
  

   in 
  number, 
  are 
  ossified. 
  

  

  1)2 
  

  

  