﻿PLATE 
  IV. 
  

  

  Page. 
  

   Fig. 
  1-3. 
  Stenopteeodus 
  elongatus, 
  St. 
  J. 
  and 
  W 
  — 
  106 
  

  

  1 
  a. 
  Maxillary 
  posterior 
  tootb, 
  right 
  ramu?, 
  a 
  medium 
  size, 
  somewhat 
  worn 
  spe- 
  

  

  cimen, 
  seen 
  from 
  above. 
  Warsaw 
  limestone; 
  Warsaw 
  111. 
  Coll. 
  Prof. 
  

   Worthen 
  

  

  2 
  a. 
  A 
  smaller 
  tooth 
  of 
  the 
  same 
  form, 
  left 
  ramus, 
  view 
  from 
  above, 
  showing 
  ob- 
  

  

  lique 
  direction 
  of 
  antero-lateral 
  border, 
  etc.; 
  2 
  6, 
  do., 
  inner 
  margin; 
  2c, 
  

   do.; 
  profile 
  from 
  the 
  posterior 
  extremity, 
  Same 
  formation, 
  locality 
  and 
  

   collection. 
  

  

  3 
  a. 
  Mandibular 
  posterior 
  tooth, 
  left 
  ramus, 
  an 
  imperfect 
  example, 
  seen 
  from 
  

  

  above; 
  3 
  &, 
  do., 
  inner 
  margin; 
  3 
  c, 
  do., 
  profile 
  from 
  anterior 
  border. 
  Same 
  

   formation, 
  locality 
  and 
  collection. 
  

  

  Fig. 
  4-8. 
  Stenopteeodus 
  pabvulus, 
  St. 
  'J. 
  and 
  W 
  107 
  

  

  J 
  4 
  a. 
  Maxillary 
  posterior 
  tooth, 
  right 
  ramus, 
  from 
  above. 
  (The 
  form 
  originally 
  

   described 
  under 
  Scandalodus 
  parvulus, 
  N. 
  and 
  W.) 
  St. 
  Louis 
  limestone; 
  

   St 
  Louis, 
  Mo. 
  O. 
  St. 
  John. 
  

  

  5 
  a. 
  Maxillary 
  posterior 
  tooth, 
  left 
  ramus, 
  view 
  from 
  above 
  of 
  a 
  nearly 
  perfect 
  in- 
  

  

  dividual. 
  St. 
  Louis 
  limestone; 
  St. 
  Louis, 
  Mo. 
  0. 
  St. 
  John. 
  

  

  6 
  a. 
  Mandibular 
  posterior 
  tooth, 
  right 
  ramus, 
  from 
  above. 
  Same 
  formation; 
  

  

  Alton, 
  111. 
  Mr. 
  Van 
  Home. 
  

  

  7 
  a. 
  The 
  same 
  form, 
  left 
  ramus, 
  view 
  from 
  above. 
  St. 
  Louis; 
  Alton; 
  Mr. 
  Van 
  

  

  Home. 
  

   V 
  8 
  a. 
  Mandibular 
  median 
  tootb, 
  left 
  ramus, 
  seen 
  from 
  above; 
  enlarged; 
  8 
  b, 
  do., 
  

   antero-lateral 
  border; 
  8 
  c, 
  do., 
  inner 
  margin^ 
  8 
  d, 
  do., 
  outer 
  inrolled 
  mar- 
  

   gin. 
  St. 
  Louis 
  limestone; 
  St. 
  Louis, 
  Mo. 
  Mr. 
  Van 
  Home. 
  

  

  Fig. 
  9-14. 
  Stenopteeodus 
  planus, 
  St. 
  J. 
  and 
  W.. 
  »-....... 
  ........ 
  102: 
  

  

  in^qC, 
  '/ 
  9 
  a. 
  Maxillary 
  posterior 
  tooth, 
  left 
  ramus, 
  from 
  above; 
  8 
  &, 
  do., 
  inner 
  margin; 
  8 
  c, 
  

   do., 
  outer 
  inrolled 
  margin; 
  8 
  d, 
  do., 
  foreshortened 
  view 
  from 
  the 
  poste- 
  

   rior 
  extremity. 
  Upper 
  Burlington 
  fish-bed; 
  Louisa 
  county, 
  Iowa. 
  Coll. 
  

   Mr. 
  Springer. 
  

   10 
  a. 
  The 
  same 
  form 
  of 
  right 
  ramus, 
  seen 
  from 
  above, 
  outline 
  restored. 
  Same 
  for- 
  

   mation 
  and 
  locality. 
  O. 
  St. 
  John. 
  

   *iV 
  ** 
  a 
  ' 
  Mandibular 
  posterior 
  tooth, 
  left 
  ramus, 
  seen 
  from 
  above; 
  11 
  6, 
  do., 
  inner 
  

   margin; 
  11 
  c, 
  do., 
  outer 
  inrolled 
  margin; 
  11 
  d, 
  do., 
  foreshortened. 
  View 
  

   from 
  anterior 
  border. 
  Same 
  formation 
  and 
  locality. 
  Mr. 
  Springer 
  

   12 
  a. 
  Same 
  form 
  of 
  opposite 
  ramus, 
  from 
  above. 
  Same 
  formation, 
  locality 
  and 
  

   collection. 
  

  

  ^ 
  13 
  a. 
  Mandibular 
  median 
  tooth, 
  left 
  ramus, 
  view 
  from 
  above, 
  enlarged; 
  13 
  &, 
  do., 
  

   inner 
  margin; 
  13 
  c, 
  do., 
  outer 
  inrolled 
  margin; 
  13 
  d, 
  do., 
  antero-lateral 
  

   border; 
  13 
  e, 
  do., 
  postero-lateral 
  border. 
  Upper 
  Burlington; 
  Augusta. 
  

   Iowa. 
  O. 
  St. 
  John. 
  

  

  J 
  14 
  a. 
  A 
  large 
  example 
  of 
  the 
  same 
  form, 
  right 
  ramus, 
  view 
  from 
  above, 
  borders 
  

   restored; 
  14 
  6, 
  do., 
  inner 
  margin; 
  14 
  c, 
  do., 
  outer 
  inrolled 
  margin; 
  14 
  d, 
  

   do., 
  antero-lateral 
  border; 
  14 
  e, 
  do., 
  postero-lateral 
  border. 
  Upper 
  Bur- 
  

   lington; 
  Louisa 
  county, 
  Iowa. 
  Mr. 
  Springer. 
  

  

  Fig. 
  15-16. 
  Stenopteeodus 
  Sp? 
  105. 
  

  

  15 
  a. 
  Maxillary 
  posterior 
  tooth, 
  left 
  ramus, 
  a 
  worn 
  specimen 
  seen 
  from 
  above; 
  

   15 
  6, 
  do., 
  inner 
  margin; 
  15 
  c, 
  do., 
  outer 
  inrolled 
  margin. 
  Keokuk 
  lime- 
  

   stone; 
  Warsaw, 
  111. 
  Prof. 
  Worthen. 
  

  

  