﻿480 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [.54] 
  

  

  above 
  as 
  quadratus 
  lumborum, 
  have 
  a 
  far 
  better 
  right 
  to 
  be 
  considered 
  

   psoas 
  parvus 
  than 
  to 
  bear 
  the 
  former 
  name, 
  because 
  it 
  must 
  be 
  remem- 
  

   bered 
  that 
  the 
  vertebrae 
  from 
  which 
  they 
  arise, 
  though 
  dorsal 
  in 
  Mana- 
  

   tee, 
  are 
  lumbar 
  in 
  man. 
  

  

  It 
  is 
  thus 
  made 
  evident, 
  it 
  seems 
  to 
  me, 
  that 
  tendinous 
  terminations 
  

   of 
  a 
  muscle 
  in 
  the 
  Manatee 
  perfectly 
  homologous 
  with 
  the 
  psoas 
  usually 
  

   inserted 
  into 
  the 
  trochanter 
  minor 
  of 
  the 
  femur 
  of 
  normal 
  forms, 
  actually 
  

   find 
  their 
  way 
  to 
  the 
  tendinous 
  aponeurosis 
  of 
  the 
  great 
  flat 
  tail 
  which 
  

   represents 
  the 
  feet 
  of 
  normal 
  forms. 
  This 
  would 
  seem 
  to 
  follow 
  from 
  

   the 
  consideration 
  of 
  the 
  arguments 
  adduced 
  in 
  favor 
  of 
  the 
  doctrine 
  that 
  

   the 
  insertions 
  of 
  certain 
  limb 
  muscles 
  are 
  translocated 
  backwards 
  in 
  

   the 
  pinnipeds. 
  

  

  The 
  fibers 
  in 
  the 
  great 
  lateral 
  tail 
  folds 
  have 
  a 
  generally 
  backward 
  

   and 
  outward 
  direction 
  from 
  the 
  spinal 
  column, 
  according 
  to 
  Murie's 
  

   figures, 
  and 
  the 
  great 
  medullary 
  plate 
  of 
  "aponeurotic 
  fibers" 
  along 
  its 
  

   inner 
  border 
  or 
  attachment 
  to 
  the 
  side 
  of 
  the 
  caudal 
  chain 
  of 
  vertebras 
  

   lies 
  below 
  the 
  level 
  of 
  the 
  transverse 
  processes, 
  its 
  anterior 
  portion 
  

   showing 
  a 
  very 
  strongly 
  marked 
  inclination 
  to 
  assume 
  a 
  ventro-lateral 
  

   position, 
  which, 
  if 
  continued 
  forward, 
  would 
  strike 
  the 
  pelvis 
  lying 
  some 
  

   distance 
  below 
  the 
  axial 
  column. 
  

  

  It 
  is 
  probably 
  along 
  this 
  line 
  extending 
  from 
  the 
  pelvis 
  to 
  the 
  flukes 
  

   that 
  the 
  atrophy 
  of 
  the 
  limbs 
  of 
  the 
  sirenians 
  has 
  occurred. 
  

  

  VIII. 
  — 
  On 
  what 
  appear 
  to 
  be 
  tactile 
  nAIRS 
  or 
  vibrissa 
  in 
  

  

  CETACEANS 
  AND 
  SIRENIANS. 
  

  

  A 
  few 
  scattered 
  hairs 
  are 
  found 
  about 
  the 
  lips 
  of 
  the 
  adults 
  of 
  some 
  

   of 
  the 
  right 
  whales, 
  and 
  it 
  may 
  be 
  interesting 
  to 
  call 
  attention 
  to 
  an 
  

   embryonic 
  trait 
  of 
  Rhachianectes. 
  In 
  an 
  embryo 
  of 
  Rhachianectes, 
  Fig. 
  

   1, 
  Plate 
  I, 
  there 
  are 
  present 
  minute 
  dermal 
  pits 
  having 
  a 
  very 
  singular 
  

   distribution 
  between 
  the 
  external 
  openings 
  and 
  the 
  tip 
  of 
  the 
  muzzle. 
  

   A. 
  smaller 
  number 
  of 
  them 
  are 
  found 
  just 
  below 
  the 
  edge 
  of 
  the 
  lower 
  

   lip, 
  as 
  seen 
  in 
  the 
  side 
  view 
  of 
  this 
  embryo. 
  The 
  distribution 
  of 
  these 
  

   rostral 
  hair 
  follicles 
  is 
  shown 
  from 
  above, 
  in 
  Fig. 
  2. 
  There 
  is 
  some 
  

   evidence 
  that 
  these 
  structures, 
  as 
  in 
  those 
  from 
  which 
  the 
  vibrissa? 
  of 
  

   the 
  upper 
  lip 
  of 
  Camivora 
  grow, 
  are 
  arranged 
  in 
  rows, 
  but 
  not 
  so 
  regu- 
  

   larly 
  as 
  those 
  shown 
  in 
  the 
  embryo 
  walrus, 
  as 
  seen 
  from 
  the 
  side. 
  In 
  

   the 
  embryo 
  kitten 
  about 
  an 
  inch 
  long, 
  as 
  in 
  the 
  walrus, 
  they 
  are 
  confined 
  

   to 
  the 
  upper 
  lip 
  on 
  the 
  sides 
  of 
  the 
  muzzle, 
  and 
  are 
  limited 
  to 
  a 
  small 
  

   circumscribed 
  area 
  somewhat 
  elevated 
  from 
  the 
  adjacent 
  integument. 
  

   In 
  none 
  of 
  the 
  other 
  cetacean 
  embryos 
  studied 
  by 
  me 
  were 
  these 
  pits 
  

   for 
  the 
  vibrissas 
  so 
  numerous 
  as 
  in 
  Rhachianectes, 
  and 
  in 
  an 
  embryo 
  of 
  

   Phocwna 
  communis, 
  Fig. 
  7, 
  there 
  is 
  a 
  single 
  row 
  of 
  seven 
  of 
  them 
  on 
  

   either 
  side 
  of 
  the 
  muzzle 
  lying 
  in 
  a 
  shallow 
  groove 
  one-eighth 
  of 
  an 
  inch 
  

   above 
  the 
  edge 
  of 
  the 
  upper 
  lip 
  ; 
  none 
  present 
  on 
  the 
  sides 
  of 
  the 
  lower 
  

   lip. 
  In 
  the 
  younger 
  ones 
  and 
  in 
  Globioccphalus 
  they 
  were 
  not 
  present 
  

   or 
  at 
  least 
  distinguishable 
  with 
  the 
  aid 
  of 
  a 
  pocket 
  lens. 
  

  

  