﻿in 
  North 
  America. 
  

  

  211 
  

  

  described, 
  under 
  the 
  name 
  Beyrichia 
  pustulosa, 
  a 
  species 
  from 
  

   the 
  Zone 
  D 
  of 
  Arisaig, 
  of 
  which 
  he 
  says, 
  " 
  This 
  species 
  

   resembles 
  very 
  nearly 
  the 
  B. 
  tuber 
  culata 
  of 
  Kloden, 
  as 
  

   described 
  and 
  figured 
  by 
  Mr. 
  T. 
  Rupert 
  Jones."* 
  Of 
  this 
  

   form, 
  Murchison 
  writes, 
  in 
  "Silnria," 
  as 
  follows, 
  viz: 
  u 
  Of 
  the 
  

   latter 
  genus, 
  the 
  Upper 
  Silurian 
  species 
  is 
  B. 
  tuberculata. 
  It 
  

   is 
  very 
  abundant 
  from 
  the 
  Wenlock 
  shale 
  to 
  the 
  highest 
  Lud- 
  

   low 
  stratum, 
  and 
  is 
  a 
  good 
  index 
  of 
  Upper 
  Silurian 
  rocks, 
  

   though 
  found 
  sometimes 
  in 
  the 
  upper 
  division 
  of 
  the 
  Caradoc" 
  

   (p. 
  236). 
  

  

  In 
  addition 
  to 
  these 
  characteristic 
  species 
  of 
  the 
  Tilestone 
  

   fauna 
  in 
  the 
  Maine 
  and 
  Arisaig 
  rocks, 
  a 
  majority 
  of 
  the 
  forms 
  

   described 
  in 
  Sowerby's 
  original 
  list 
  of 
  that 
  fauna 
  are 
  repre- 
  

   sented 
  by 
  the 
  same, 
  or 
  closely 
  allied 
  forms, 
  in 
  both 
  the 
  Chap- 
  

   man 
  sandstone 
  and 
  Zone 
  D 
  (Honey 
  man), 
  Arisaig 
  ; 
  as 
  will 
  

   appear 
  from 
  the 
  following 
  table, 
  viz 
  : 
  

  

  List 
  of 
  representative 
  species 
  of 
  the 
  Tilestone 
  fauna 
  in 
  the 
  Chapman 
  sand- 
  

   stone, 
  Maine 
  ; 
  and 
  Zone 
  D, 
  Arisaig, 
  Nova 
  Scotia. 
  

  

  

  Tilestone. 
  

  

  Chapman 
  sandstone. 
  

  

  Zone 
  D, 
  Arisaig. 
  

  

  1. 
  

  

  Cypricardia 
  cymbaeformis 
  

  

  Groniophora 
  cf. 
  Hamil- 
  

  

  C. 
  cymbaeformis, 
  cf. 
  Nu- 
  

  

  

  

  ton! 
  as 
  

  

  culites 
  (Orthonota) 
  

   carinata 
  Hall 
  

  

  2. 
  

  

  Pullastra 
  laevis 
  

  

  Cypricardella 
  cf. 
  gre- 
  

  

  

  

  

  garius 
  

  

  not 
  reported 
  

  

  

  

  f 
  Palaeoneilo 
  cf. 
  cuneatus 
  

  

  Cleidophorus 
  cuneatus 
  

  

  3. 
  

   4. 
  

   5. 
  

  

  CucuUaea 
  antiqua 
  

   C. 
  ovata 
  

   C. 
  cawdori 
  

  

  | 
  P. 
  cf. 
  concentneus 
  

   j 
  P. 
  cf. 
  elongatus 
  

   j 
  P. 
  cf. 
  nuculiformis 
  

  

  C. 
  concentricus 
  

   C. 
  erectus 
  

  

  C. 
  elongatus 
  

  

  | 
  P. 
  cf. 
  subovatus 
  

  

  C. 
  semiradiatus 
  

  

  

  

  (_ 
  and 
  others. 
  

  

  C. 
  nuculiformis 
  

   C. 
  subovatus 
  

  

  6. 
  

  

  Area 
  ? 
  

  

  ? 
  

  

  ? 
  

  

  7. 
  

  

  Avicula 
  rectangularis 
  

  

  Pterinea 
  rectangularis 
  

  

  ?cf. 
  Avicula 
  Honeymani 
  

  

  8. 
  

  

  Leptaena 
  lata 
  

  

  j 
  Chonetes 
  nova 
  scotica 
  

   \ 
  C. 
  canadensis 
  

  

  C. 
  nova-scotica 
  H. 
  

  

  

  

  C. 
  tenuistriata 
  

  

  

  

  f 
  Sp. 
  arrectus 
  var. 
  

  

  Sp. 
  regaecosta 
  

  

  9. 
  

  

  Spirifer 
  ptychodes 
  

  

  j 
  Sp. 
  concinnus 
  

   j 
  Sp. 
  cyclopterus 
  Bill. 
  

  

  Sp. 
  subsulcatus 
  

  

  

  (= 
  S. 
  elevata 
  Dalman) 
  

  

  

  

  

  ^Sp. 
  raricosta 
  Bill. 
  

  

  

  10. 
  

  

  Orthis 
  lunata 
  

  

  ? 
  

  

  ? 
  

  

  11. 
  

  

  Terebratula 
  nucula 
  

  

  not 
  seen 
  

  

  Rhynchonella 
  (3 
  spe- 
  

  

  

  (= 
  Rhynchonella) 
  

  

  

  cies) 
  

  

  12. 
  

  

  Lingula 
  cornea 
  

  

  not 
  seen 
  

  

  Lingula 
  sp. 
  

  

  13. 
  

  

  Xatica 
  glaucinoides 
  

  

  ? 
  

  

  ? 
  

  

  14. 
  

  

  Trochus 
  helicites 
  

  

  Pleurotomaria 
  sp. 
  

   (M 
  227) 
  

  

  ? 
  

  

  15. 
  

  

  Turbo 
  Williamsi 
  

  

  Holopea 
  cf. 
  Danai 
  

  

  ? 
  

  

  16. 
  

  

  Turritella 
  obsoleta 
  

  

  ? 
  

  

  Murchisonia 
  Arisai- 
  

  

  IT. 
  

  

  T. 
  gregaria 
  

  

  Loxonema 
  cf. 
  planogyrata 
  

  

  gensis 
  

   ? 
  

  

  18. 
  

  

  T. 
  conica 
  

  

  ? 
  

  

  M. 
  aciculata 
  

  

  * 
  See 
  Jones' 
  identification 
  of 
  this 
  species 
  in 
  the 
  Arisaig 
  rocks 
  m 
  Q. 
  J. 
  G-. 
  S., 
  

   xxvi, 
  p. 
  492. 
  

  

  