﻿PA 
  M 
  ".ONTOLOGY 
  OF 
  ELLINOl 
  

  

  tudinal 
  rags, 
  and 
  showing 
  beneath 
  the 
  vertical 
  prismatic 
  struc- 
  

   ture 
  and 
  punctn, 
  the 
  latter 
  minutely 
  and 
  closely 
  pitting 
  tin 
  worn 
  

  

  t; 
  the 
  crown 
  also 
  shows 
  the 
  broadly 
  arched 
  lin< 
  

   growth 
  to 
  which 
  the 
  posterior 
  margin 
  in 
  worn 
  individuals 
  moil 
  

   less 
  conforms. 
  'J 
  he 
  basal 
  portion 
  of 
  the 
  tooth 
  is 
  nol 
  known. 
  

   Transverse 
  diameter 
  of 
  tooth 
  across 
  the 
  posterior 
  margin 
  

   9 
  mm 
  ; 
  length 
  along 
  median 
  line 
  7.5 
  mm. 
  

   The 
  ah 
  sribed 
  Bpeoies 
  is 
  represented 
  by 
  a 
  oniqne 
  example 
  

  

  I 
  by 
  l>r. 
  Qeorge 
  Hambach, 
  showing 
  nearly 
  the 
  entire 
  coro- 
  

   nal 
  area, 
  but 
  the 
  basaj 
  portion 
  is 
  destroyed, 
  and 
  the 
  i 
  

  

  n 
  worn 
  even 
  with 
  the 
  broadly 
  arched 
  curvature 
  of 
  the 
  liw 
  

   growth. 
  stero-lateral 
  cornna 
  are 
  also 
  absenl 
  from 
  the 
  same 
  

  

  : 
  otherwise 
  the 
  specimen 
  clearly 
  displays 
  it- 
  distinctive 
  

   peculiarities. 
  Compared 
  with 
  the 
  preceding 
  species 
  from 
  the 
  St. 
  

   Louis 
  limestone, 
  Copodua 
  Von 
  II<>riiii, 
  the 
  present 
  form 
  is 
  

   tinguished 
  by 
  its 
  mote 
  angnlar 
  outline, 
  the 
  lateral 
  borders 
  much 
  

   less 
  rapidly 
  converging 
  anteriorly, 
  and 
  perhaps 
  the 
  more 
  uniform 
  

   oonv< 
  \ity 
  of 
  the 
  coronal 
  surface. 
  The 
  specimen 
  somewhat 
  n 
  - 
  

   bles 
  certain 
  forms 
  from 
  the 
  Irish 
  Lower 
  Carboniferous 
  deposits 
  

   referred 
  by 
  Professor 
  Agassis 
  to 
  the 
  intimately 
  allied 
  gums 
  Pinnae- 
  

   minx 
  : 
  but 
  if 
  we 
  correctly 
  interpret 
  the 
  distinctive 
  peculiarities 
  of 
  the 
  

   latter 
  genus, 
  the 
  present 
  tooth 
  differs 
  in 
  not 
  possessing 
  tin 
  emar- 
  

   ginated 
  anterior 
  margin 
  which 
  characterizes 
  that 
  genus, 
  as 
  

   represented 
  bj 
  tin 
  typical 
  form 
  1'. 
  gonoplax, 
  

  

  logical 
  position 
  and 
  locality: 
  Chester 
  limestone; 
  Chester, 
  111. 
  

  

  