﻿PLATE 
  XVIII. 
  

  

  P6AMMODU8 
  C.HLATls, 
  St. 
  J. 
  and 
  V\" 
  

  

  * 
  Fig. 
  1 
  (i. 
  Maxillary 
  tootb, 
  Tlew 
  Of 
  triturating 
  surf 
  hoi', 
  inner 
  articular 
  b< 
  'rod 
  

  

  in 
  outline; 
  l 
  ';. 
  do., 
  exterior 
  border; 
  l 
  e. 
  dowi 
  posterior 
  margin: 
  1 
  d 
  

   line 
  from 
  anterior 
  margin: 
  1 
  - 
  . 
  ■! 
  . 
  longitudinal 
  profile 
  section. 
  Bl 
  

   Pellii, 
  Iowa, 
  Mr. 
  Van 
  H 
  

  

  / 
  l'VAMMODL'S 
  CRABSIDEN8. 
  St 
  J. 
  and 
  W 
  

  

  \\l"l 
  ■ 
  Fig. 
  2 
  (i. 
  A 
  small 
  tootb, 
  showing 
  the 
  coronal 
  ratface 
  w.irn 
  smooth, 
  view 
  from 
  abo-. 
  

  

  !•>., 
  inner 
  articular 
  border: 
  I 
  < 
  ■; 
  9 
  <l. 
  dOw, 
  posterior 
  

  

  margin; 
  IS 
  a. 
  do., 
  anterior 
  margin. 
  la, 
  Iowa, 
  an. 
  

  

  Fig.:i<j. 
  A. 
  relatively 
  shorter 
  tooth 
  ol 
  the 
  same 
  form, 
  from 
  al 
  

  

  the 
  rugoso 
  coronal 
  surface: 
  :i 
  b. 
  do 
  . 
  articular 
  border: 
  3c. 
  do., 
  exterior 
  

   der;Sd. 
  do., 
  articular 
  border: 
  9 
  - 
  nor 
  margin; 
  3 
  /. 
  do., 
  in}' 
  

  

  surface; 
  the 
  del 
  • 
  al 
  layer 
  exfoliated. 
  Original 
  ot 
  "Pa. 
  mo*tu», 
  m 
  EL 
  

  

  Oeol. 
  Surv. 
  II. 
  PL 
  XI. 
  f. 
  I 
  

  

  Fie. 
  i 
  <i. 
  A 
  more 
  elongate 
  example 
  "f 
  the 
  same 
  form, 
  the 
  triturating 
  surface 
  

   Ing 
  traoes 
  of 
  the 
  tran 
  1 
  6. 
  do^ 
  artiaular 
  border; 
  i 
  

  

  Vin.i 
  lor 
  margti 
  - 
  'on. 
  Mr. 
  i 
  

  

  Fig. 
  5 
  >i. 
  a. 
  large 
  entire 
  example 
  ol 
  the 
  same 
  form, 
  the 
  coronal 
  i 
  

   and 
  showing 
  t 
  I 
  basal 
  rim 
  <>f 
  ti 
  

  

  '■. 
  do., 
  articular 
  border: 
  f> 
  <\ 
  <Io., 
  from 
  the 
  exterior 
  I 
  

  

  margin; 
  S 
  s. 
  do., 
  anterior 
  margin. 
  9 
  n<-. 
  

  

  Fig. 
  ti 
  n. 
  An 
  Immatore 
  large 
  t<>..tu 
  ..f 
  tin> 
  Mini' 
  I 
  inner 
  half 
  ol 
  tl 
  

  

  taoe 
  presenting 
  beautiful 
  rugose 
  murk:' 
  lo., 
  artlealar 
  b 
  i 
  

  

  Loui-: 
  Ait.. 
  n. 
  Mr. 
  Barb 
  

  

  

  