﻿386 
  On 
  the 
  Paheozoic 
  Diaalved 
  Entomostraca. 
  

  

  shape 
  much 
  more 
  closely 
  resembles 
  L. 
  suborhiculata 
  

   (Miinster), 
  Ann. 
  & 
  Mag. 
  Nat. 
  Hist. 
  May 
  1865, 
  p. 
  407, 
  

   pi. 
  xx. 
  fig. 
  7. 
  The 
  shell 
  is 
  superficially 
  roughened 
  from 
  the 
  

   effects 
  of 
  exposure. 
  

  

  The 
  specimen 
  consists 
  of 
  white 
  limestone, 
  and 
  in 
  this 
  

   respect 
  resembles 
  the 
  Leperditia 
  Billingsii 
  *, 
  J. 
  (Ann. 
  & 
  

   Mag. 
  Nat. 
  Hist. 
  ser. 
  5, 
  vol. 
  viii. 
  1881, 
  p. 
  345, 
  pi. 
  xx. 
  tig. 
  9), 
  

   from 
  Lower-Silurian 
  strata 
  near 
  Lake 
  Winnipeg. 
  

  

  The 
  little 
  fossil 
  before 
  us 
  is 
  from 
  " 
  the 
  parish 
  of 
  St. 
  An- 
  

   drew, 
  Manitoba, 
  in 
  the 
  valley 
  of 
  the 
  Red 
  River, 
  in 
  rock 
  of 
  

   about 
  the 
  age 
  of 
  the 
  Utica 
  Slate 
  or 
  upper 
  part 
  of 
  the 
  Trenton 
  

   Formation." 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

   Plate 
  XVI. 
  

  

  [All 
  the 
  figures 
  are 
  magnified 
  15 
  diain. 
  except 
  figs. 
  2 
  b 
  and 
  6.] 
  

  

  Fig. 
  1. 
  Primitia 
  mundulu, 
  J., 
  var. 
  Left 
  valve; 
  a 
  cast. 
  

  

  Fig. 
  2. 
  The 
  same, 
  var. 
  a, 
  right 
  valve 
  ; 
  b, 
  ornament 
  of 
  the 
  valve, 
  x 
  75 
  

  

  diam. 
  

   Fig. 
  3. 
  Primitia 
  scaphoidez, 
  sp. 
  nov. 
  Right 
  valve. 
  

   Fig. 
  4. 
  Primitia 
  mundula, 
  J., 
  var. 
  a, 
  right 
  valve 
  ; 
  b, 
  edge 
  view 
  ; 
  c, 
  end 
  

  

  view. 
  

   Fig. 
  5. 
  The 
  same, 
  var. 
  a, 
  right 
  valve 
  ; 
  b, 
  edge 
  view 
  ; 
  c, 
  end 
  view. 
  

   Fig. 
  0. 
  Primitia 
  mundula, 
  J. 
  a, 
  right 
  valve 
  ; 
  b, 
  ornament, 
  X 
  75 
  diam. 
  

   Fig. 
  7. 
  The 
  same, 
  var. 
  a, 
  left 
  valve, 
  cast 
  ; 
  b, 
  edge 
  view 
  ; 
  c, 
  end 
  view. 
  

   Fig. 
  8. 
  Primitia 
  mundula, 
  J., 
  var. 
  Left 
  valve, 
  cast, 
  with 
  a 
  small 
  film 
  of 
  

  

  shell. 
  

   Fig. 
  9. 
  Primitia 
  mundula, 
  J. 
  Right 
  valve, 
  crushed 
  cast, 
  with 
  parts 
  of 
  

  

  the 
  shell. 
  

  

  [Figs 
  1-9 
  from 
  Camphellton, 
  New 
  Brunswick.] 
  

  

  Plate 
  XVII. 
  

  

  [All 
  the 
  figures 
  are 
  magnified 
  10 
  diam.] 
  

  

  Fiy. 
  1. 
  Primitia 
  mundula, 
  J., 
  var. 
  Left 
  valve. 
  

  

  Fig. 
  2. 
  Primitia 
  cequalis, 
  J. 
  & 
  H. 
  Right 
  valve, 
  young. 
  

  

  Fig. 
  <j. 
  Beyriehia 
  Klcedeni, 
  M'Coy, 
  var. 
  acadica, 
  nov. 
  Left 
  valve. 
  

  

  Fig. 
  4. 
  The 
  same, 
  a, 
  left 
  valve 
  ; 
  6, 
  dorsal 
  edge 
  view 
  ; 
  e, 
  front 
  view. 
  

  

  Fig. 
  5. 
  The 
  same. 
  Left 
  valve. 
  

  

  Fig. 
  0. 
  The 
  same, 
  a, 
  left 
  valve 
  ; 
  b, 
  ventral 
  edge 
  view 
  ; 
  c, 
  posterior 
  

  

  view. 
  

   Fig. 
  7. 
  Beyriehia 
  areuata 
  (Bean), 
  a, 
  right 
  valve 
  (cast 
  retaining 
  some 
  of 
  

  

  the 
  shell) 
  ; 
  b, 
  dorsal 
  edge 
  view 
  ; 
  c, 
  front 
  view. 
  

  

  * 
  Possibly 
  this 
  may 
  belong 
  to 
  Aparchites 
  also. 
  

  

  