﻿Report 
  of 
  tee 
  State 
  Geologist. 
  849 
  

  

  usually 
  sessile 
  spondylium 
  of 
  the 
  brachial 
  valve 
  may 
  also 
  prove 
  

   a 
  distinguishing 
  feature. 
  

  

  Niagara 
  dolomites. 
  Near 
  Milwaukee,. 
  Wisconsin. 
  

  

  Parastrophia 
  latiplicata, 
  sp. 
  nov. 
  

  

  (Plate 
  briii, 
  figs. 
  23-27.) 
  

  

  This 
  species 
  is 
  distinguished 
  from 
  the 
  two 
  preceding 
  by 
  its 
  

  

  smaller 
  size, 
  less 
  robust 
  form, 
  two 
  broad 
  plications 
  on 
  the 
  fold 
  

  

  and 
  one 
  in 
  the 
  sinus, 
  with 
  but 
  a 
  single 
  pair 
  on 
  the 
  lateral 
  slopes. 
  

  

  Niagara 
  dolomites. 
  Near 
  Milwaukee, 
  Wisconsin. 
  

  

  Liorhynchus 
  Lesleyi, 
  sp. 
  nov. 
  

   (Plate 
  lix, 
  figs. 
  34-36.) 
  

   Shell 
  of 
  medium 
  size 
  with 
  shallow 
  pedicle-, 
  and 
  deep 
  brachial 
  

   valve. 
  Median 
  sinus 
  on 
  the 
  former 
  well 
  defined; 
  median 
  fold 
  on 
  

   the 
  latter 
  broad 
  and 
  not 
  sharply 
  delimited. 
  Surface 
  of 
  both 
  

   valves 
  sharply 
  and 
  abundantly 
  plicated. 
  

   Upper 
  Devonian. 
  Pennsylvania. 
  

  

  Barrandella 
  Areyi, 
  sp 
  nov. 
  

   (Plate 
  lxxi, 
  figs. 
  14-16.) 
  

  

  Shell 
  small, 
  ventricose, 
  with 
  sinus 
  on 
  the 
  pedicle- 
  valve 
  and 
  fold 
  

   on 
  the 
  brachial 
  valve. 
  Surface 
  on 
  both 
  valves 
  rather 
  sharply 
  and 
  

   coarsely 
  plicated, 
  the 
  largest 
  plication 
  being 
  in 
  the 
  median 
  sinus, 
  

   with 
  traces 
  of 
  finer 
  ones 
  on 
  the 
  slopes 
  of 
  the 
  sinus. 
  The 
  median 
  

   fold 
  bears 
  two 
  well-defined 
  plications 
  with 
  faint 
  traces 
  of 
  others, 
  

   while 
  on 
  each 
  lateral 
  slope 
  of 
  the 
  valves 
  there 
  are 
  four 
  or 
  five 
  

   less 
  sharply 
  angular 
  ribs. 
  

  

  Clinton 
  group. 
  Rochester, 
  N. 
  Y. 
  

  

  Conchidium 
  Greenii, 
  sp. 
  nov. 
  

  

  (Plate 
  lxvi, 
  figs. 
  20-22.) 
  

  

  Shell 
  subequally 
  biconvex, 
  ventricose, 
  subcircular 
  in 
  marginal 
  

  

  outline. 
  Unibones 
  full 
  and 
  rounded, 
  both 
  incurved, 
  that 
  of 
  the 
  

  

  pedicle-valve 
  somewhat 
  elevated. 
  There 
  is 
  no 
  evidence 
  of 
  median 
  

  

  fold 
  and 
  sinus. 
  Surface 
  of 
  each 
  valve 
  bearing, 
  over 
  the 
  pallial 
  

  

  region, 
  from 
  forty-five 
  to 
  fifty 
  rounded 
  plications, 
  which 
  very 
  

  

  gradually 
  increase 
  by 
  implantation 
  and 
  become 
  more 
  numerous 
  

  

  anteriorly. 
  These 
  plications 
  are 
  of 
  slightly 
  unequal 
  size, 
  which 
  

  

  107 
  

  

  