﻿468 
  EEPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [42] 
  

  

  equivalent 
  to 
  the 
  dorsal 
  muscles, 
  and 
  named 
  by 
  him 
  respectively 
  lon- 
  

   gissiinus 
  inferior, 
  sacro-lumbalis 
  inferior, 
  and 
  transversarius 
  inferior. 
  

   So 
  far 
  I 
  agree 
  with 
  the 
  latter, 
  and 
  therefore 
  differ 
  from 
  Rapp, 
  that 
  the 
  

   great 
  sublumbo-caudal 
  cetacean 
  muscle 
  is 
  not 
  purely 
  an 
  iliopsoas. 
  

   This 
  latter, 
  I 
  believe, 
  as 
  in 
  Manatus, 
  is 
  all 
  but 
  aborted, 
  certainly 
  not 
  

   recognizable. 
  The 
  homologue 
  of 
  the 
  cetacean 
  sublumbar 
  muscle, 
  then 
  

   with 
  its 
  tendons 
  and 
  investing 
  sheath, 
  seems 
  to 
  me 
  to 
  be 
  the 
  sacro-coc- 
  

   cygeus, 
  whatever 
  its 
  significance 
  as 
  to 
  tbe 
  dorsal 
  series. 
  My 
  iufracau- 
  

   dal 
  may 
  represent 
  partly 
  inferior 
  intertransversarii 
  caudre 
  or 
  perhaps 
  

   include 
  infracoccygeus. 
  

  

  " 
  In 
  default 
  of 
  being 
  able 
  to 
  determine 
  with 
  accuracy 
  spinal 
  inser- 
  

   tions 
  in 
  Globiceps 
  I 
  was 
  more 
  fortunate 
  in 
  Lagenorhynchus. 
  In 
  this 
  

   genus 
  the 
  rectus 
  abdominis 
  tapers 
  to 
  a 
  point 
  at 
  the 
  fortieth 
  vertebra, 
  

   behind 
  this 
  intermingling 
  with 
  the 
  caudal 
  fascia. 
  The 
  pubo-coccygeus 
  

   goes 
  to 
  the 
  chevron 
  bones 
  as 
  far 
  as 
  the 
  sixtieth 
  sacro-coccygeus, 
  muscu- 
  

   lar 
  to 
  forty-fifth, 
  tendons 
  to 
  sixtieth 
  ; 
  between 
  these 
  points 
  the 
  secon- 
  

   dary 
  tendons 
  which 
  form 
  the 
  sheath 
  emerge. 
  Supracaudal 
  from 
  fortieth 
  

   to 
  sixty-sixth 
  vertebra 
  ; 
  the 
  infracaudal 
  is 
  from 
  two 
  to 
  three 
  vertebrae 
  

   shorter. 
  Longissimusdorsi, 
  &c, 
  narrows 
  at 
  sixtieth 
  ; 
  two 
  oblique 
  ten- 
  

   dons 
  given 
  off 
  at 
  thirty-seventh 
  ; 
  the 
  others 
  behiud, 
  ere 
  producing 
  apo- 
  

   neurotic 
  sheath 
  the 
  spinalis 
  dorsi, 
  &c, 
  its 
  final 
  tendons 
  inserted 
  from 
  

   the 
  sixty-fourth 
  to 
  the 
  seventieth 
  vertebral 
  diapophyses. 
  

  

  " 
  A 
  series 
  of 
  levatores 
  costarum, 
  of 
  moderate 
  strength, 
  and 
  passing 
  

   from 
  the 
  transverse 
  processes 
  to 
  the 
  ribs, 
  exists 
  in 
  all 
  the 
  species 
  of 
  whales 
  

   I 
  have 
  dissected.* 
  

  

  "In 
  the 
  lumbar 
  region 
  of 
  G. 
  melas 
  the 
  intertransversalest 
  are 
  power- 
  

   ful, 
  they 
  diminish 
  in 
  strength 
  forwards, 
  and 
  can 
  barely 
  be 
  detected 
  in 
  

   the 
  most 
  anterior 
  dorsals 
  and 
  cervicals. 
  In 
  L. 
  albirostris, 
  whilst 
  fleshy, 
  

   they 
  are 
  shorter, 
  owing 
  to 
  the 
  close 
  approximation 
  of 
  the 
  very 
  numerous 
  

   and 
  long 
  divergent 
  transverse 
  processes. 
  In 
  P. 
  communis 
  caudally 
  

   they 
  are 
  tendinous; 
  in 
  the 
  lumbar 
  region, 
  semitendinous 
  and 
  fleshy, 
  a 
  

   superior 
  and 
  inferior 
  division 
  is 
  noticeable. 
  

  

  " 
  According 
  to 
  the 
  development 
  of 
  the 
  neural 
  spines, 
  cervical, 
  dorsal, 
  

   lumbar, 
  and 
  caudal, 
  so 
  are 
  the 
  interspinals 
  £ 
  stroug 
  or 
  weak. 
  But 
  as 
  

   a 
  series 
  of 
  muscular 
  bundles 
  they 
  are, 
  I 
  believe, 
  present 
  in 
  every 
  ceta- 
  

   cean. 
  They 
  have 
  been 
  met 
  with 
  by 
  me 
  in 
  five 
  genera. 
  

  

  " 
  Both 
  Rapp§ 
  and 
  Stanuius|| 
  have 
  described 
  in 
  the 
  porpoise 
  a 
  set 
  of 
  

   muscles 
  linking 
  together 
  the 
  chevron 
  bones. 
  They 
  name 
  these 
  M. 
  in- 
  

   terspiuales 
  inferiores. 
  They 
  are 
  distinctly 
  marked 
  in 
  Globiceps, 
  Grampus, 
  

   and 
  the 
  white-beaked 
  Bottle-nose 
  and 
  Rorqual. 
  They 
  undoubtedly 
  re- 
  

   semble 
  the 
  iuterspinales 
  superiores 
  of 
  these 
  authors, 
  but 
  pass 
  from 
  one 
  

   chevron 
  hcemo-spiual 
  element 
  to 
  the 
  adjoining. 
  I 
  prefer 
  to 
  designate 
  

  

  * 
  Described 
  also 
  by 
  the 
  oft-quoted 
  German 
  authorities. 
  

   tThe 
  intertransversarii 
  of 
  the 
  foregoing. 
  

   t 
  The 
  m. 
  interspinales 
  superiores 
  of 
  the 
  preceding 
  writers. 
  

   § 
  Op. 
  (At., 
  p. 
  83. 
  || 
  Op. 
  cit., 
  p. 
  40. 
  

  

  