﻿AND 
  AYES 
  OF 
  NORTH 
  AMERICA. 
  

  

  P 
  ELI 
  ON, 
  Wijman. 
  

  

  Proc. 
  Acad. 
  Natl. 
  Sci. 
  Philadelphia, 
  1868, 
  p. 
  211. 
  Baniceps, 
  Wyman 
  Amer. 
  Journal 
  Sci. 
  and 
  Arts, 
  1858,p. 
  158. 
  

   Not 
  of 
  Cuvier, 
  (Pediculati.) 
  

  

  PELION 
  LYELLII, 
  Wyman. 
  Baniceps- 
  lyeelii, 
  Wyman, 
  I. 
  c. 
  

  

  This 
  animal 
  differs 
  from 
  the 
  genus 
  Amphibamus, 
  in 
  the 
  well 
  ossified 
  vertebral 
  axis 
  ; 
  

   no 
  remains 
  of 
  a 
  tail 
  with 
  elevated 
  neural 
  spines 
  exist 
  in 
  the 
  type 
  specimen, 
  nor 
  have 
  

   ventral 
  scales 
  or 
  sclerotic 
  bones 
  been 
  seen. 
  

  

  Middle 
  Coal 
  Measures, 
  Jefferson 
  county, 
  Eastern 
  Ohio. 
  

  

  HYLONOMUS, 
  Dawson. 
  

  

  • 
  

  

  This 
  genus 
  embraces 
  the 
  smallest 
  species 
  of 
  the 
  order. 
  They 
  all 
  pertain 
  to 
  that 
  

   interesting 
  Batrachian 
  fauma 
  of 
  the 
  Coal 
  Measures 
  of 
  the 
  Joggins 
  of 
  Nova 
  Scotia, 
  eluci- 
  

   dated 
  chiefly 
  through 
  the 
  exertions 
  of 
  Principal 
  Dawson, 
  of 
  Montreal. 
  This 
  fauma 
  

   embraces 
  six 
  of 
  the 
  Microsauria 
  and 
  one 
  true 
  Labyrinthodont. 
  Of 
  the 
  former, 
  the 
  

   Hylerpeton 
  dawsonii 
  Owen, 
  is 
  the 
  largest 
  species, 
  the 
  Dendropetons 
  next, 
  and 
  the 
  

   Hylonomus 
  wymanii 
  is 
  the 
  smallest. 
  As 
  Dr. 
  Dawson 
  has 
  described 
  these 
  curious 
  

   animals 
  in 
  the 
  "Canadian 
  Naturalist," 
  in 
  detail, 
  I 
  will 
  not 
  repeat 
  them 
  here, 
  but 
  add 
  a 
  

   list 
  expressing 
  some 
  peculiarities 
  of 
  dentition, 
  which 
  are 
  highly 
  important 
  in 
  the 
  deter- 
  

   mination 
  of 
  species. 
  This, 
  giving 
  the 
  number 
  of 
  teeth 
  in 
  a 
  line 
  of 
  1-1 
  2th 
  of 
  an 
  inch, 
  has 
  

   been 
  furnished 
  me 
  by 
  Prof 
  Dawson. 
  

  

  HYLONOMUS 
  LYELLII, 
  Dawson. 
  

   Loc. 
  Cit. 
  VIIL, 
  167, 
  Coal 
  Measures 
  of 
  Nova 
  Scotia. 
  

  

  HYLONOMUS 
  ACIEDENTATUS, 
  Dawson. 
  

   Loc. 
  Cit. 
  VIIL, 
  258, 
  Coal 
  Measures; 
  with 
  the 
  last. 
  

  

  HYLONOMUS 
  WYMANII, 
  Dawson. 
  

  

  Loc. 
  Cit. 
  VIIL, 
  270, 
  Coal 
  Measures 
  ; 
  with 
  the 
  last. 
  

  

  No. 
  of 
  Teeth 
  in 
  Line. 
  

   Dendrerpeton 
  acadianum. 
  

  

  Outer 
  series 
  of 
  teeth, 
  4 
  teeth 
  in 
  one 
  line 
  to 
  1^ 
  liue. 
  

  

  Inner 
  do. 
  4 
  iu 
  2i 
  lines. 
  

  

  D. 
  owenii. 
  

  

  Outer 
  Series, 
  4 
  in 
  one 
  line. 
  

  

  Inner 
  do. 
  4 
  in 
  two 
  to 
  2{ 
  lines. 
  

  

  Hylerpeton 
  dawsonii, 
  4 
  in 
  five 
  lines. 
  

  

  Hylonomus 
  lyelli, 
  12 
  in 
  two 
  lines. 
  

  

  H. 
  wymanii, 
  12 
  in 
  1£ 
  lines. 
  

   AMERI. 
  PHILOSO. 
  SOU. 
  — 
  VOL. 
  XIV. 
  3 
  

  

  