﻿OF 
  THE 
  BALTIC 
  PROVINCES 
  OF 
  RUSSIA. 
  521 
  

  

  Eichw., 
  Leptama 
  transversa, 
  Pand., 
  L. 
  convexa, 
  Pand., 
  L. 
  oblonga, 
  

   Pand., 
  Strophomena 
  imbrex, 
  Pand., 
  Porambonites 
  cequirostris, 
  Pand., 
  

   P. 
  deformatus, 
  Eichw., 
  Orihis 
  lynx, 
  Eichw., 
  0. 
  calligramma, 
  Dalm., 
  

   &c. 
  ; 
  among 
  Echinodermata, 
  the 
  Cystideans 
  Echinosphcerites 
  auran- 
  

   tium, 
  Gyll., 
  E. 
  balticus, 
  Eichw., 
  Hemicosmites 
  malum, 
  Eichw., 
  and 
  

   oiir 
  oldest 
  Crinoid 
  Hybocrinus 
  dipentas, 
  Leucht. 
  True 
  corals 
  do 
  not 
  

   yet 
  exist 
  ; 
  but 
  the 
  typical 
  Chcetetes 
  petropolitana, 
  Pand., 
  0. 
  hetero- 
  

   solen, 
  Keys., 
  and 
  C. 
  Pander 
  I, 
  E. 
  & 
  H., 
  occur 
  very 
  often. 
  

  

  This 
  stage 
  corresponds 
  to 
  the 
  uppermost 
  Orthoceratite 
  Limestone 
  

   of 
  Sweden, 
  as 
  developed 
  in 
  Oeland 
  and 
  Westrogothia, 
  and 
  also 
  to 
  the 
  

   lower 
  part 
  of 
  the 
  C%«smops-rimestone 
  of 
  the 
  same 
  regions. 
  The 
  Cys- 
  

   tidean 
  limestone 
  of 
  Tornqvist 
  in 
  Dalarne 
  answers 
  fairly 
  well 
  to 
  our 
  

   stage. 
  Even 
  in 
  Norway 
  our 
  stage 
  has 
  corresponding 
  strata, 
  according 
  

   to 
  Prof. 
  Brogger. 
  In 
  the 
  British 
  Islands 
  it 
  is 
  not 
  possible 
  to 
  detect 
  

   parallel 
  stages 
  : 
  but 
  in 
  Canada, 
  some 
  parts 
  of 
  the 
  Quebec 
  group 
  con- 
  

   taining 
  Cheirurus 
  vulcanus, 
  C. 
  perforator, 
  and 
  C. 
  glaucus 
  may 
  furnish 
  

   material 
  for 
  comparison. 
  

  

  2, 
  Kuckers 
  Shale 
  (Brandschiefer). 
  

  

  The 
  upper 
  stage 
  of 
  our 
  group 
  C, 
  i. 
  e. 
  C 
  2, 
  is 
  very 
  marly. 
  It 
  is 
  

   connected 
  with 
  C 
  1, 
  as 
  regards 
  the 
  fauna, 
  but 
  differs 
  in 
  its 
  lithological 
  

   aspect, 
  as 
  the 
  stage 
  is 
  characterized 
  by 
  bituminous 
  marls 
  and 
  lime- 
  

   stones. 
  This 
  stage 
  I 
  can 
  distinguish 
  only 
  west 
  of 
  St. 
  Petersburg, 
  

   from 
  Djatlizy, 
  as 
  far 
  as 
  Odensholm, 
  at 
  the 
  western 
  angle 
  of 
  Esthonia. 
  

   East 
  of 
  St. 
  Petersburg 
  the 
  Echinosphserite 
  Limestone 
  is 
  directly 
  

   covered 
  by 
  the 
  Devonian. 
  The 
  stage 
  C 
  2 
  excels 
  all 
  other 
  stages 
  

   among 
  our 
  Silurian 
  strata 
  by 
  its 
  beautifully 
  preserved 
  fossils. 
  The 
  

   best 
  locality 
  is 
  Kuckers 
  near 
  Tewe, 
  and 
  I 
  have 
  given 
  it 
  the 
  local 
  

   title 
  of 
  the 
  'Kuckers 
  zone.' 
  In 
  the 
  bituminous 
  marls 
  all 
  the 
  

   minor 
  forms 
  of 
  Beyrichice, 
  Bryozoa, 
  &c. 
  are 
  wonderfully 
  well 
  pre- 
  

   served 
  ; 
  and 
  hence 
  we 
  can 
  form 
  a 
  vivid 
  idea 
  of 
  the 
  old 
  Silurian 
  marine 
  

   life. 
  The 
  thickness 
  of 
  the 
  stage 
  may 
  be 
  estimated 
  at 
  30-50 
  feet. 
  

   The 
  fauna 
  is 
  very 
  similar 
  to 
  that 
  of 
  stage 
  C 
  1, 
  as 
  I 
  have 
  already 
  pointed 
  

   out; 
  but 
  yet 
  some 
  species 
  have 
  disappeared, 
  and 
  other 
  allied 
  ones 
  have 
  

   taken 
  their 
  places. 
  Among 
  Trilobites 
  I 
  shall 
  name 
  Phacops 
  exilis, 
  

   Eichw., 
  P. 
  (Chasmops) 
  Odini, 
  Eichw., 
  Cheirurus 
  spinulosus, 
  Nieszk., 
  

   C. 
  (Nieszkoivskia) 
  cephaloceras, 
  Nieszk., 
  Lichas 
  conicotuberculata 
  , 
  

   Nieszk., 
  Gybele 
  rex, 
  Nieszk., 
  revaliensis, 
  mihi, 
  and 
  others. 
  Among 
  

   other 
  classes 
  Pleurotomaria 
  elliptica, 
  His., 
  Subulites 
  prisms, 
  Eichw., 
  

   Bdlerophon 
  Czehanoivskii, 
  mihi, 
  Hyolites 
  striatus, 
  Eichw., 
  Nucula 
  

   cedilis 
  and 
  N. 
  macromya, 
  Eichw., 
  Siphonotreta 
  unguiculata, 
  Eichw., 
  

   Pseudocrania 
  planissima, 
  Eichw., 
  Porambonites 
  teretior, 
  Eichw., 
  Or- 
  

   thisina 
  squamata, 
  Pahlen, 
  0. 
  marginata, 
  Pahlen, 
  Orthis 
  lynx, 
  Eichw., 
  

   0. 
  dorsata, 
  His., 
  Echinosphwrites 
  aurantium, 
  Glyptocystites 
  penniger, 
  

   Eichw., 
  Chcetetes 
  petropolitana, 
  Polyjwrafurcata^iohw., 
  Thamniscus 
  

   bifidus, 
  Eichw., 
  &c. 
  

  

  Our 
  stage 
  C 
  2 
  corresponds 
  very 
  fairly 
  to 
  the 
  Chasmojis-limestone 
  

   of 
  Scandinavia, 
  occurring 
  in 
  Oeland, 
  Westrogothia, 
  and 
  Norway. 
  

  

  Q.J.O.S. 
  No. 
  152. 
  2n 
  

  

  