﻿AND 
  AYES 
  OF 
  NORTH 
  AMERICA. 
  

  

  77 
  

  

  Width 
  at 
  anterior 
  point 
  of 
  splenial, 
  

   " 
  near 
  extremity, 
  

   " 
  an 
  inch 
  behind 
  fork, 
  

   " 
  between 
  rami 
  at 
  same 
  point, 
  

  

  Teeth 
  opposite 
  symphysis, 
  

  

  In. 
  

   2. 
  

   1.9 
  

   1. 
  

  

  13. 
  

  

  Lin. 
  

  

  4 
  

   13 
  

  

  The 
  larger 
  teeth 
  are 
  all 
  broken, 
  but 
  one 
  with 
  fang 
  exposed, 
  would 
  probably 
  measure 
  when 
  complete 
  1 
  in., 
  10 
  lin. 
  

   The 
  form 
  of 
  some 
  of 
  the 
  smaller 
  is 
  well 
  represented 
  in 
  Leidy's 
  figures 
  above 
  cited; 
  they 
  are 
  acuminate, 
  strongly 
  

   incurved, 
  of 
  a 
  full 
  lenticular 
  section, 
  with 
  an 
  anterior 
  and 
  posterior 
  raised 
  cutting 
  ridge, 
  in 
  the 
  transverse 
  plane 
  of 
  

   the 
  crown. 
  The 
  sides 
  present 
  numerous 
  narrow 
  weakly 
  defined 
  facets, 
  and 
  are 
  in 
  a 
  half 
  protruded 
  one, 
  finely 
  striate. 
  

   The 
  alveoli 
  do 
  not 
  open 
  on 
  the 
  horizontal 
  plane 
  of 
  the 
  inside 
  of 
  the 
  mandible, 
  but 
  the 
  latter 
  is 
  raised 
  above 
  them 
  

   for 
  the 
  posterior 
  half 
  of 
  the 
  symphyseal 
  portion 
  of 
  the 
  jaw 
  ; 
  the 
  latter 
  is 
  more 
  depressed 
  towards 
  the 
  extremity. 
  

   Teeth 
  from 
  other 
  specimens 
  and 
  localities 
  exhibit 
  marked 
  characters. 
  They 
  are 
  all 
  much 
  curved 
  and 
  slender 
  conic, 
  

   and 
  subcylindric 
  ; 
  the 
  tip 
  smooth, 
  the 
  remainder 
  more 
  or 
  less 
  extensively 
  minutely 
  striate, 
  but 
  not 
  fluted 
  or 
  ridged. 
  

   The 
  fang 
  is 
  slightly 
  flattened. 
  In 
  T. 
  neocaesariensis 
  the 
  crowns 
  are 
  relatively 
  shorter, 
  less 
  curved 
  and 
  more 
  obtuse; 
  

   in 
  both 
  the 
  anteroposterior 
  dividing 
  ridge 
  is 
  well 
  marked. 
  Part 
  of 
  the 
  teeth 
  attributed 
  by 
  Leidy 
  to 
  Hyposaurus 
  

   belong 
  here 
  ; 
  see 
  synonymes. 
  

  

  The 
  muzzle 
  of 
  a 
  larger 
  individual 
  from 
  Birmingham, 
  accompanied 
  vertebrae 
  of 
  this 
  species, 
  with 
  a 
  smaller 
  gavial 
  

   cranium 
  in 
  fragments 
  ; 
  and 
  a 
  cervical 
  vertebra 
  similar 
  to 
  that 
  described 
  under 
  Bottosam-us 
  harlani. 
  Its 
  reference 
  to 
  

   this 
  species 
  is 
  not 
  certain, 
  but 
  I 
  give 
  a 
  figure 
  of 
  it. 
  

  

  The 
  lateral 
  maxillo-premaxillary 
  suture 
  is 
  not 
  preserved, 
  so 
  the 
  number 
  of 
  premaxillary 
  teeth 
  cannot 
  be 
  exactly 
  

   ascertained; 
  there 
  are 
  four 
  to 
  the 
  line 
  of 
  the 
  posterior 
  margin 
  of 
  the 
  large 
  incisive 
  foramen, 
  of 
  which 
  the 
  anterior 
  is 
  

   quite 
  small. 
  The 
  posterior 
  palatal 
  suture 
  of 
  the 
  same 
  element 
  is 
  prolonged 
  in 
  a 
  narrow 
  chevron 
  on 
  the 
  median 
  line 
  

   below, 
  to 
  opposite 
  the 
  eighth 
  alveolus 
  from 
  the 
  front 
  ; 
  there 
  are 
  nine 
  alveoli 
  behind 
  this 
  point, 
  to 
  the 
  broken 
  

   extremity. 
  A 
  noteworthy 
  character 
  consists 
  in 
  the 
  presence 
  at 
  the 
  posterior 
  part 
  of 
  the 
  series 
  of 
  deep 
  fossae 
  

   between 
  the 
  maxillary 
  alveola 
  for 
  the 
  reception 
  of 
  the 
  mandibular 
  teeth, 
  showing 
  that 
  the 
  latter 
  did 
  not 
  project 
  

   externally 
  between 
  the 
  former, 
  as 
  in 
  the 
  existing 
  gavial. 
  The 
  same 
  structure 
  appears 
  in 
  the 
  smaller 
  cranium 
  which 
  

   accompanied 
  it,* 
  but 
  is 
  not 
  found 
  in 
  the 
  Thor. 
  neocaesariensis. 
  

  

  Fie. 
  19. 
  

  

  Fig. 
  20. 
  

  

  * 
  The 
  fronto-parietal 
  region 
  of 
  this 
  one 
  Is 
  described 
  under 
  head 
  of 
  H. 
  brevisplnts. 
  

   AMERI. 
  THILOSO. 
  SOC. 
  VOL. 
  XIV. 
  20 
  

  

  