﻿Report 
  of 
  the 
  State 
  Geologist. 
  369 
  

  

  While 
  similar 
  in 
  outline 
  to 
  some 
  forms 
  now 
  referred 
  to 
  

   JPanenJca, 
  it 
  is 
  quite 
  evident 
  from 
  the 
  data 
  supplied 
  by 
  the 
  

   Portage 
  species 
  referred 
  to, 
  that 
  such 
  shells 
  as 
  these 
  must 
  be 
  

   separated 
  not 
  only 
  from 
  Panenka 
  but 
  also 
  from 
  the 
  Devonian 
  

   Paracas, 
  Cardiolas 
  and 
  Glyptocar 
  % 
  dias. 
  It 
  is, 
  therefore, 
  provision- 
  

   ally 
  referred 
  to 
  the 
  old 
  genus 
  Zucina, 
  although 
  it 
  is 
  quite 
  certain 
  

   that 
  the 
  reference 
  is 
  not 
  exact. 
  

  

  In 
  the 
  lithographic 
  figure 
  the 
  cardinal 
  slopes 
  are 
  much 
  too 
  

   sharp 
  and 
  direct, 
  giving 
  the 
  shell 
  an 
  unnatural 
  resemblance 
  to 
  

   a 
  Lunulicardium. 
  

  

  Lunulicardium 
  Livonise, 
  sp. 
  nov. 
  

   Plate 
  IV, 
  fig. 
  11. 
  

  

  Shell 
  represented 
  by 
  a 
  left 
  valve, 
  which 
  is 
  of 
  small 
  size 
  and 
  

   has 
  the 
  normal 
  proportions 
  of 
  L. 
  ornatum, 
  Hall, 
  of 
  the 
  Naples 
  

   shales. 
  It 
  is, 
  however, 
  much 
  more 
  finely 
  ribbed, 
  the 
  surface 
  

   bearing 
  about 
  60 
  plications, 
  which 
  are 
  mostly 
  simple, 
  but 
  a 
  few 
  

   showing 
  signs 
  of 
  duplication 
  toward 
  the 
  margin. 
  In 
  L. 
  ornatum 
  

   the 
  number 
  of 
  plications 
  in 
  normal 
  adults 
  is 
  rarely 
  over 
  50, 
  and 
  

   correspondingly 
  less 
  in 
  immature 
  shells. 
  

  

  The 
  valve 
  measures 
  18 
  mm. 
  in 
  length 
  and 
  15 
  mm. 
  in 
  greatest 
  

   transverse 
  diameter. 
  

  

  From 
  the 
  dark 
  Hamilton 
  shales 
  at 
  570 
  feet 
  in 
  the 
  Shaft. 
  

  

  Lunulicardium 
  (??) 
  lineolatum, 
  sp. 
  nov. 
  

  

  Plate 
  III, 
  fig. 
  2. 
  

   Shell 
  small, 
  with 
  sharply 
  sloping 
  cardinal 
  margins, 
  diverging 
  

   from 
  the 
  apex 
  at 
  an 
  angle 
  of 
  135°; 
  periphery 
  subcircular 
  ; 
  apex 
  

   slightly 
  incurved, 
  surface 
  evenly 
  convex. 
  Anterior 
  cardinal 
  line 
  

   straight 
  and 
  sharply 
  defined 
  ; 
  posterior 
  cardinal 
  slope 
  less 
  abrupt, 
  

   quite 
  convex 
  and 
  incurved. 
  (This 
  feature 
  is 
  not 
  satisfactorily 
  

   represented 
  ill 
  the 
  figure.) 
  Surface 
  covered 
  with 
  low 
  concentric 
  

   wrinkles 
  or 
  rounded 
  striae, 
  and 
  these 
  are 
  crossed 
  by 
  a 
  series 
  of 
  

   fine, 
  sharp, 
  radial, 
  elevated 
  lines, 
  which 
  are 
  most 
  numerous 
  and 
  

   best 
  defined 
  in 
  the 
  umbonal 
  region, 
  comparatively 
  few 
  extending 
  

   to 
  the 
  margins 
  of 
  the 
  valve. 
  The 
  shell 
  has 
  a 
  corneous 
  appearance, 
  

   and 
  it 
  is 
  probable 
  that 
  there 
  is 
  but 
  little 
  calcareous 
  matter 
  in 
  its 
  

   composition. 
  The 
  species 
  is 
  provisionally 
  referred 
  to 
  the 
  genus 
  

   Lunulicardium, 
  in 
  full 
  realization 
  of 
  the 
  fact 
  that 
  it 
  is 
  not 
  a 
  

   47 
  

  

  