﻿374 
  Prof. 
  T. 
  R. 
  Jones 
  on 
  the 
  

  

  being 
  difficult 
  of 
  determination 
  on 
  account 
  of 
  their 
  presenting 
  

   passage-forms 
  with 
  gradational 
  characters, 
  some 
  of 
  which 
  are 
  

   at 
  first 
  sight 
  apparently 
  distinct 
  enough 
  for 
  specification, 
  but, 
  

   really 
  failing 
  in 
  their 
  distinctness, 
  are 
  not 
  in 
  every 
  case 
  

   easily 
  reduced 
  to 
  a 
  satisfactory 
  serial 
  order. 
  On 
  this 
  account 
  

   all 
  the 
  more 
  definite 
  variations 
  in 
  the 
  two 
  sets 
  of 
  specimens 
  

   have 
  been 
  carefully 
  represented 
  in 
  the 
  two 
  accompanying 
  

   Plates 
  *. 
  Plate 
  XVI. 
  illustrates 
  a 
  gradational 
  series 
  (nine 
  in 
  

   number) 
  of 
  true 
  Primitue 
  from 
  the 
  Lower- 
  Devonian 
  strata 
  of 
  

   Campbellton, 
  New 
  Brunswick 
  ; 
  and 
  in 
  Plate 
  XVII. 
  figs. 
  1- 
  

   9 
  show 
  a 
  collection 
  of 
  Primitian 
  and 
  Beyrichian 
  forms, 
  and 
  

   fig. 
  11 
  an 
  Isochilina, 
  from 
  the 
  Upper- 
  Silurian 
  (Lower-Helder- 
  

   berg) 
  strata 
  of 
  Cap 
  Bon-Ami, 
  Dalhousie, 
  New 
  Brunswick. 
  

   The 
  two 
  localities 
  are 
  about 
  16 
  miles 
  apart, 
  and 
  in 
  each 
  case 
  

   the 
  specimens 
  were 
  collected 
  by 
  Mr. 
  A. 
  H. 
  Foord, 
  F.G.S., 
  

   within 
  a 
  limited 
  area 
  of 
  a 
  few 
  square 
  yards. 
  

  

  The 
  matrix 
  of 
  the 
  specimens 
  from 
  Cap 
  Bon- 
  Ami 
  (nos. 
  24- 
  

   32) 
  is 
  a 
  greenish-grey 
  argillaceous 
  limestone 
  (or 
  calcareous 
  

   shale), 
  with 
  remnants 
  of 
  brachiopods 
  and 
  mollusks. 
  Those 
  

   from 
  Campbellton 
  (nos. 
  1-23) 
  consist 
  of 
  hard 
  shale, 
  calca- 
  

   reous 
  where 
  shells 
  and 
  bones 
  have 
  been; 
  some 
  (nos. 
  7, 
  15, 
  

   21, 
  22) 
  are 
  brownish 
  and 
  somewhat 
  ferruginous, 
  the 
  others 
  

   dark 
  grey. 
  Several 
  contain 
  plant-remains 
  and 
  fish-bones 
  

   and 
  some 
  have 
  small 
  gasteropods. 
  

  

  The 
  following 
  extracts 
  give 
  all 
  that 
  was 
  known 
  about 
  the 
  

   geology 
  of 
  the 
  localities 
  referred 
  to 
  when 
  the 
  specimens 
  were 
  

   collected 
  : 
  — 
  

  

  ' 
  Canadian 
  Naturalist 
  and 
  Geologist,' 
  vol. 
  x. 
  no. 
  2, 
  Decem- 
  

   ber 
  1881, 
  p. 
  93 
  — 
  " 
  On 
  some 
  Fossil 
  Fishes, 
  Crustacea, 
  and 
  

   Mollusca 
  from 
  the 
  [Lower] 
  Devonian 
  Rocks 
  at 
  Campbell- 
  

   ton, 
  N.B 
  ; 
  with 
  Descriptions 
  of 
  five 
  new 
  Species." 
  By 
  

   J. 
  F. 
  Whiteaves. 
  

  

  Fossil 
  tishes 
  had 
  been 
  found 
  by 
  Mr. 
  Ells 
  " 
  in 
  argillaceous 
  

   and 
  brecciated 
  limestones 
  f 
  [limestone-breccia] 
  on 
  the 
  south 
  

   bank 
  of 
  the 
  Restigouche 
  River, 
  about 
  half 
  a 
  mile 
  ab)ve 
  

   Campbellton." 
  Here 
  Mr. 
  Foord 
  soon 
  afterwards 
  found 
  

   Entomostraca, 
  besides 
  fish-remains, 
  a 
  Spirorbis, 
  and 
  two 
  

   small 
  species 
  of 
  Gasteropoda. 
  

  

  ' 
  Geological 
  Survey 
  of 
  Canada. 
  — 
  The 
  Fossil 
  Plants 
  of 
  the 
  

   Erian 
  (Devonian) 
  and 
  Upper-Silurian 
  Formations 
  of 
  Canada.' 
  

  

  * 
  Mr. 
  C. 
  Davies 
  Sherborn, 
  F.G.S., 
  has 
  helped 
  me 
  in 
  sorting, 
  sketching, 
  

   and 
  collating 
  these 
  Canadian 
  Entomostraca. 
  

  

  t 
  " 
  The 
  rock 
  is 
  for 
  the 
  most 
  part 
  a 
  dolomitic 
  agglomerate 
  [breccia] 
  

   passing 
  upwards 
  into 
  coarse 
  shales 
  and 
  associated 
  with 
  felsitic 
  and 
  trap- 
  

   pean 
  bed^." 
  

  

  