﻿34 
  Mr. 
  F. 
  E. 
  Beddard 
  07i 
  the 
  

  

  The 
  deltoid 
  is 
  well 
  developed 
  ; 
  it 
  is 
  inserted 
  on 
  to 
  ratlier 
  

   more 
  than 
  the 
  first 
  half 
  of 
  the 
  humerus. 
  

  

  The 
  biceps 
  arises 
  by 
  the 
  usual 
  long 
  tendon 
  from 
  the 
  

   scapula. 
  

  

  Both 
  the 
  rhomboidei 
  have, 
  as 
  in 
  Podica 
  senegalensis, 
  an 
  

   aponeurotic 
  origin 
  from 
  the 
  vertebral 
  column. 
  The 
  super- 
  

   ficial 
  rhomboideus 
  is 
  quite 
  double 
  the 
  length 
  of 
  the 
  deeper 
  

   muscle_, 
  and 
  overlaps 
  it 
  for 
  nearly 
  its 
  whole 
  length. 
  

  

  The 
  tensor 
  fasciae 
  is 
  large 
  ; 
  the 
  anterior 
  half 
  of 
  the 
  muscle 
  

   has 
  a 
  tendinous 
  origin^ 
  the 
  posterior 
  half 
  a 
  muscular 
  origin, 
  

   which 
  extends 
  a 
  long 
  way 
  behind 
  the 
  acetabulum. 
  

  

  The 
  biceps 
  is 
  at 
  its 
  origin 
  completely 
  covered 
  by 
  the 
  last 
  

   muscle 
  ; 
  indeed, 
  the 
  origin 
  of 
  the 
  tensor 
  fasciae 
  extends 
  con- 
  

   siderably 
  beyond 
  the 
  point 
  where 
  the 
  origin 
  of 
  the 
  biceps 
  

   leaves 
  off; 
  this 
  muscle 
  is 
  comparatively 
  slight, 
  only 
  8 
  mm. 
  

   in 
  diameter 
  at 
  its 
  origin, 
  which 
  is 
  fleshy. 
  The 
  biceps 
  has 
  

   two 
  insertions 
  : 
  one 
  of 
  these 
  is 
  like 
  that 
  found 
  in 
  nearly 
  all 
  

   other 
  birds, 
  i. 
  e. 
  it 
  ends 
  in 
  a 
  stout 
  tendon, 
  wliich 
  passes 
  

   through 
  a 
  tendinous 
  loop, 
  and 
  is 
  inserted 
  on 
  to 
  the 
  tibia 
  ; 
  

   the 
  second 
  insertion 
  is 
  on 
  to 
  the 
  fascia 
  covering 
  the 
  gas- 
  

   trocnemius. 
  

  

  In 
  describing 
  the 
  anatomy 
  of 
  Podica 
  senegalensis 
  1 
  had 
  

   occasion 
  to 
  point 
  out* 
  the 
  very 
  remarkable 
  conformation 
  of 
  

   the 
  biceps 
  femoris 
  in 
  that 
  bird, 
  which 
  has 
  three 
  separate 
  

   insertions, 
  and 
  is 
  more 
  complicated 
  than 
  in 
  any 
  other 
  bird 
  of 
  

   which 
  the 
  muscular 
  structure 
  is 
  known. 
  It 
  will 
  be 
  observed 
  

   that 
  the 
  biceps 
  femoris 
  of 
  the 
  American 
  genus 
  is 
  like 
  that 
  of 
  

   the 
  African, 
  with 
  the 
  only 
  exception 
  that 
  it 
  wants 
  the 
  third 
  

   insertion 
  present 
  in 
  the 
  former. 
  The 
  condition 
  of 
  this 
  muscle 
  

   in 
  the 
  two 
  genera 
  of 
  Heliornithidse 
  seems 
  to 
  show 
  that 
  the 
  

   smaller 
  American 
  form 
  has 
  a 
  more 
  simjilified 
  structure 
  Avhen 
  

   compared 
  with 
  its 
  larger 
  African 
  relative. 
  I 
  point 
  out 
  later 
  

   that 
  the 
  skull- 
  characters 
  show 
  the 
  same 
  kind 
  of 
  reduction, 
  

   which 
  I 
  cannot 
  help 
  associating 
  with 
  the 
  size 
  of 
  the 
  bird. 
  

  

  The 
  semitendinosus 
  and 
  the 
  semimembranosus 
  may 
  be 
  con- 
  

   sidered 
  together, 
  for 
  they 
  form 
  one 
  continuous 
  mass 
  at 
  their 
  

   origin, 
  of 
  which 
  the 
  two 
  constituent 
  parts 
  were 
  iudistin- 
  

   * 
  Op. 
  cit. 
  p. 
  429. 
  

  

  