﻿NO. 
  1975. 
  A 
  MOUyTED 
  ZEUGLODOX 
  SKELETON— 
  GIDLEY. 
  

  

  651 
  

  

  short 
  and 
  heavy 
  with 
  a 
  well 
  developed 
  deltoid 
  ridge, 
  reaching 
  well 
  

   below 
  the 
  middle 
  of 
  the 
  shaft. 
  A 
  small 
  portion 
  of 
  the 
  shaft 
  is 
  missing 
  

   and 
  as 
  here 
  restored 
  is 
  probably 
  somewhat 
  too 
  long. 
  This 
  element 
  

   is 
  not 
  at 
  all 
  cetaceanlike 
  in 
  char- 
  

   acter. 
  The 
  bones 
  of 
  the 
  fore- 
  

   arm 
  are 
  flattened 
  laterally 
  and 
  

   articulate 
  with 
  each 
  other 
  as 
  

   they 
  do 
  in 
  the 
  whales 
  and 
  

   sea 
  lions, 
  resembling 
  somewhat 
  

   more 
  nearly 
  those 
  of 
  the 
  latter. 
  

   The 
  manus 
  is 
  not 
  Icnown, 
  but 
  

   judging 
  from 
  modifications 
  of 
  

   the 
  radius 
  and 
  ulna, 
  it 
  was 
  

   evidently 
  highly 
  specialized 
  and 
  

   paddle 
  or 
  flipper 
  like 
  as 
  in 
  the 
  

   whales 
  and 
  sea 
  lions. 
  The 
  form 
  

   ajid 
  arrangement 
  of 
  these 
  distal 
  

   elements 
  as 
  here 
  restored 
  (see 
  

   fig. 
  1) 
  are 
  jiecessarily 
  in 
  great 
  

   degree 
  conjectural, 
  the 
  corre- 
  

   sponding 
  parts 
  in 
  both 
  the 
  

   whale 
  and 
  the 
  sea 
  lion 
  being 
  

   used 
  as 
  a 
  guide 
  in 
  modeling 
  

   them. 
  The 
  fact 
  that 
  the 
  known 
  

   forefoot 
  elements 
  of 
  the 
  closel}^ 
  

   related 
  genus 
  Bourdon, 
  a 
  few 
  

   phalanges 
  of 
  which 
  are 
  pre- 
  

   served 
  with 
  one 
  of 
  the 
  speci- 
  

   mens 
  (No. 
  4679) 
  in 
  the 
  United 
  

   States 
  National 
  Museum, 
  re- 
  

   semble 
  so 
  much 
  more 
  those 
  of 
  

   the 
  sea 
  lions 
  than 
  they 
  do 
  

   those 
  of 
  the 
  whales, 
  seems 
  to 
  

   justify 
  including 
  more 
  sea 
  lion 
  

   than 
  whale 
  like 
  character 
  in 
  

   restoring 
  the 
  paddles. 
  Thus 
  

   digit 
  I, 
  the 
  hallux, 
  is 
  shortened, 
  

   and 
  digits 
  II 
  and 
  III 
  are 
  made 
  

   longest 
  and 
  heaviest 
  of 
  the 
  

   series. 
  

  

  The 
  vestigial 
  pelvic 
  bones 
  and 
  

   femur, 
  all 
  that 
  is 
  known 
  of 
  the 
  

   hind 
  limbs, 
  have 
  been 
  fully 
  described 
  by 
  Lucas 
  ^ 
  and 
  are 
  mentioned 
  and 
  

   again 
  figured 
  here 
  (see 
  figs. 
  2 
  and 
  3, 
  p. 
  652) 
  because 
  of 
  the 
  doubt 
  which 
  

  

  -Fore 
  limb 
  of 
  American 
  Zeuglodon. 
  

   About 
  ^ 
  natural 
  size. 
  

  

  ■ 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  23, 
  1900, 
  p. 
  329, 
  pis. 
  5-7. 
  

  

  