﻿192 
  

  

  MISS 
  G. 
  L. 
  ELLES 
  ON 
  THE 
  SUBGENERA 
  [May 
  i8q7j 
  

  

  Spec. 
  

  

  Locality. 
  

  

  Lgth. 
  

  

  W. 
  opp. 
  

   ap. 
  2 
  1 
  . 
  

  

  Opp. 
  

  

  4 
  1 
  . 
  

  

  Opp. 
  8 
  l 
  

   max. 
  

  

  L.1 
  1 
  . 
  

  

  L. 
  I 
  2 
  . 
  

  

  Max. 
  

  

  No. 
  to 
  

   inch. 
  

  

  A. 
  

  

  Belcraig 
  ... 
  

  

  T 
  

  

  i 
  

  

  3 
  

  

  T(ST 
  

  

  i 
  

  

  1 
  

  

  ■H 
  

  

  +i 
  

  

  24 
  

  

  C 
  1 
  . 
  

  

  Kallholn... 
  

  

  1 
  

  

  1 
  

  

  iS 
  

  

  £ 
  

  

  ft 
  

  

  1 
  

  

  3 
  

  

  i 
  

  

  25 
  

  

  O 
  2 
  . 
  

  

  »» 
  

  

  i 
  

  

  i 
  

  

  ft 
  

  

  

  ft 
  

  

  1 
  

   3 
  

  

  J 
  

  

  

  D. 
  

  

  „ 
  

  

  1 
  

  

  i 
  

  

  T 
  

  

  ft 
  

  

  ft 
  

  

  3 
  

  

  ^ 
  

  

  * 
  

  

  25 
  

  

  E. 
  

  

  >> 
  

  

  1 
  

  

  i 
  

  

  ft 
  

  

  ^ 
  

  

  3 
  

   XT 
  

  

  ^ 
  

  

  1 
  

  

  25 
  

  

  F. 
  

  

  „ 
  

  

  5 
  

  

  1 
  

  

  ft 
  

  

  1 
  

  

  — 
  5 
  

  

  +1 
  

  

  +i 
  

  

  25 
  

  

  G. 
  

  

  Kongslena 
  

  

  1 
  

  

  * 
  

  

  ft 
  

  

  ft 
  

  

  T 
  3 
  . 
  

  

  i 
  

  

  1 
  

   3: 
  

  

  

  I. 
  

  

  Belcraig 
  ... 
  

  

  ^ 
  

  

  £ 
  

  

  ft 
  

  

  1 
  

  

  T% 
  

  

  

  

  

  K. 
  

  

  Duffkinnell 
  

  

  1 
  

  

  * 
  

  

  i 
  

  

  + 
  * 
  

  

  1 
  

  

  

  

  24 
  

  

  Note. 
  — 
  The 
  sign 
  4- 
  in 
  the 
  above 
  table 
  is 
  intended 
  to 
  represent 
  that 
  

   the 
  measurement 
  is 
  slightly 
  in 
  excess 
  of 
  the 
  figure 
  which 
  it 
  precedes 
  ; 
  the 
  

   sign 
  — 
  denotes 
  that 
  the 
  measurement 
  is 
  slightly 
  below 
  that 
  figure. 
  Thus 
  

   4-5 
  means 
  that 
  the 
  measurement 
  is 
  more 
  than 
  £ 
  inch, 
  and 
  — 
  £ 
  that 
  it 
  is 
  less 
  

   than 
  £ 
  inch. 
  

  

  General 
  Characters. 
  — 
  In 
  summing 
  up 
  the 
  chief 
  characteristics 
  of 
  

   this 
  species 
  it 
  will 
  be 
  convenient 
  to 
  compare 
  it 
  with 
  Petalograptus 
  

   palrneus 
  (Barr.), 
  the 
  form 
  with 
  which 
  it 
  has 
  so 
  often 
  been 
  confounded 
  

   by 
  British 
  authors. 
  

  

  (1) 
  The 
  characteristic 
  foliate 
  form 
  is 
  more 
  marked 
  than 
  in 
  

   P. 
  palrneus 
  (Barr.). 
  

  

  (2) 
  The 
  form 
  attains 
  a 
  greater 
  width 
  than 
  P. 
  palrneus. 
  

  

  (3) 
  The 
  proximal 
  end 
  is 
  far 
  more 
  protracted 
  than 
  in 
  the 
  latter 
  

   species. 
  

  

  (4) 
  The 
  thecae 
  in 
  P. 
  folium 
  (His.) 
  are 
  much 
  longer, 
  the 
  angle 
  of 
  

   inclination 
  is 
  less, 
  and 
  there 
  are 
  fewer 
  in 
  the 
  space 
  of 
  an 
  inch. 
  

  

  (5) 
  There 
  exists 
  quite 
  a 
  different 
  ratio 
  between 
  the 
  length 
  of 
  the 
  

   sicula 
  and 
  the 
  length 
  of 
  the 
  thecae. 
  

  

  Horizon. 
  — 
  In 
  the 
  Moffat 
  district 
  P. 
  folium 
  (His.) 
  occurs 
  in 
  a 
  

   band 
  of 
  black 
  shale 
  distinctly 
  below 
  the 
  horizon 
  of 
  C. 
  cometa 
  (Gein.). 
  

   In 
  the 
  Lake 
  District 
  it 
  occurs 
  in 
  Marr 
  and 
  Nicholson's 
  zone 
  of 
  

   M. 
  convolutus 
  (His.), 
  a 
  zone 
  which 
  occupies 
  a 
  similar 
  position. 
  1 
  

   This 
  species 
  also 
  occurs 
  in 
  a 
  band 
  below 
  the 
  C. 
  cometa-zone 
  in 
  the 
  

   Rastrites-Shales 
  of 
  Kallholn, 
  2 
  Furudal 
  (Dalarne), 
  Kongslena 
  (Vester- 
  

   gotland), 
  and 
  at 
  Rostanga, 
  Kiviks 
  Esperod, 
  and 
  Tommarp 
  in 
  Skane. 
  

  

  The 
  species 
  is 
  also 
  known 
  in 
  the 
  ' 
  colonie 
  Haidinger 
  ' 
  in 
  Bohemia. 
  

  

  British 
  Localities. 
  — 
  Moffat 
  District 
  : 
  Dobb's 
  Linn, 
  Belcraig 
  Burn, 
  

   Duffkinnell 
  Burn, 
  near 
  Wamphray. 
  Lake 
  District 
  : 
  Skelgill. 
  

  

  1 
  See 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xliv. 
  (1888) 
  p. 
  711. 
  

  

  2 
  Geinitz, 
  ' 
  Graptoliten 
  des 
  k. 
  Mineralog. 
  Mus. 
  Dresden,' 
  1890, 
  states 
  that 
  

   Hisinger's 
  types 
  came 
  from 
  Fagelsang 
  in 
  Skane. 
  This 
  is 
  an 
  error 
  ; 
  the 
  original 
  

   specimens 
  came 
  from 
  Furudal 
  in 
  the 
  province 
  of 
  Dalarne. 
  

  

  