﻿Geology 
  and 
  Mineralogy. 
  

  

  239 
  

  

  " 
  icieder 
  Schiefern 
  " 
  of 
  the 
  Hartz 
  and 
  formations 
  in 
  other 
  regions 
  

   bearing 
  the 
  same 
  fauna. 
  This 
  limestone, 
  according 
  to 
  their 
  

   present 
  opinion, 
  is 
  scarcely 
  older 
  than 
  the 
  unter- 
  Coblenz 
  or 
  the 
  

   highest 
  of 
  the 
  Siegener 
  Schichten. 
  The 
  equivalents 
  of 
  the 
  

   Hercynian, 
  so 
  restricted, 
  are 
  the 
  Konjaprus 
  limestone 
  of 
  Bohe- 
  

   mia, 
  the 
  Erbray 
  limestone 
  of 
  France, 
  the 
  Ural 
  limestone 
  of 
  

   Bjelaja 
  river, 
  Russia, 
  and 
  the 
  Lower 
  Helderberg 
  of 
  America. 
  

  

  The 
  following 
  scheme 
  presents 
  the 
  correlations 
  of 
  the 
  Bohemian 
  

   zones, 
  through 
  the 
  Hessen 
  Nassau 
  sections, 
  with 
  the 
  standard 
  

   Eifelian 
  formations 
  : 
  

  

  ElFEL. 
  

  

  Hessen 
  Nassau. 
  

  

  Bohemia. 
  

  

  Upper 
  Stringocephalus 
  

   limestone. 
  

  

  Massen 
  limestone. 
  

  

  H 
  2 
  

  

  Lower 
  Stringocephalus 
  

   limestone. 
  

  

  Oderhauser 
  and 
  Haina 
  

   limestones. 
  

  

  H 
  1 
  

  

  Calceola 
  beds. 
  

  

  Giinterod-limestone. 
  

  

  Ballersbach-limestone. 
  

  

  G-reifenstein-limestone. 
  

  

  G 
  3 
  

   G 
  2 
  

  

  Cultrijuatus 
  beds. 
  

  

  Mnenian 
  limestone 
  ; 
  

   G'(?) 
  

  

  Lower 
  Devonian. 
  

  

  Konjeprus 
  limestone 
  

   andF 
  1 
  

  

  This 
  determination, 
  it 
  will 
  be 
  noticed, 
  restricts 
  the 
  Bohemian 
  

   formations 
  G 
  and 
  H 
  to 
  the 
  Middle 
  Devonian, 
  and 
  draws 
  the 
  line 
  

   between 
  the 
  Greif 
  enstein 
  and 
  Mnenian 
  faunas, 
  which 
  are 
  regarded 
  

   as 
  equivalent 
  to 
  the 
  Cnltrijugatus 
  beds, 
  and 
  the 
  typical 
  Hercynian 
  

   fauna 
  of 
  Lower 
  Devonian 
  age. 
  The 
  paper 
  is 
  an 
  excellent 
  illus- 
  

   tration 
  of 
  the 
  accurate 
  correlation 
  to 
  be 
  attained 
  by 
  a 
  critical 
  

   comparative 
  study 
  of 
  local 
  faunas. 
  h. 
  s. 
  w. 
  

  

  2. 
  Daimonelix 
  of 
  the 
  Lacustrine 
  Miocene 
  of 
  Nebraska. 
  — 
  Under 
  

   the 
  name 
  of 
  Daimonelix, 
  Prof. 
  E. 
  H. 
  Barbour 
  has 
  described 
  in 
  

   the 
  "University 
  Studies" 
  of 
  the 
  University 
  of 
  Nebraska 
  for 
  

   1892 
  and 
  1894, 
  large 
  open 
  coils 
  occurring 
  in 
  the 
  Nebraska 
  Mio- 
  

   cene 
  ; 
  the 
  paper 
  is 
  accompanied 
  by 
  many 
  excellent 
  figures, 
  some 
  

   of 
  them 
  from 
  photographs. 
  The 
  fossils 
  had 
  been 
  called 
  Devil's 
  

   corkscrews 
  and 
  hence 
  the 
  name 
  which 
  he 
  gives 
  them. 
  The 
  coils 
  

   stand 
  vertically 
  at 
  different 
  heights 
  in 
  a 
  bed 
  about 
  100 
  feet 
  thick, 
  

   and 
  are 
  ordinarily 
  6 
  to 
  8 
  feet 
  high, 
  though 
  ranging 
  up 
  to 
  over 
  12 
  

   feet, 
  with 
  the 
  thickness 
  of 
  the 
  stem 
  of 
  the 
  coil 
  2| 
  to 
  8 
  inches. 
  The 
  

   basal 
  portion 
  is 
  extended 
  out 
  laterally, 
  with 
  a 
  rising 
  curve, 
  to 
  a 
  

   length 
  sometimes 
  of 
  13 
  feet, 
  and 
  has 
  a 
  varying 
  diameter 
  of 
  6 
  to 
  10 
  

   inches. 
  The 
  coils 
  are 
  both 
  right 
  handed 
  and 
  left 
  handed 
  ; 
  and 
  

   sometimes 
  they 
  are 
  double. 
  

  

  They 
  were 
  first 
  thought 
  by 
  Prof. 
  Barbour 
  to 
  be 
  fossil 
  fresh- 
  

   water 
  sponges 
  ; 
  but 
  possibly 
  burrows 
  of 
  Rodents 
  which 
  had 
  

   become 
  filled 
  with 
  sand, 
  — 
  the 
  bones 
  of 
  a 
  Rodent 
  having 
  been 
  

   found 
  in 
  the 
  base 
  of 
  one 
  of 
  the 
  coils. 
  In 
  his 
  later 
  paper, 
  of 
  July, 
  

   1894, 
  he 
  states, 
  on 
  the 
  ground 
  of 
  new 
  observations, 
  that 
  the 
  

   interior 
  structure 
  of 
  the 
  coils 
  is 
  coarse 
  cellular 
  ; 
  and 
  that 
  the 
  sur- 
  

   face 
  is 
  one 
  tangle 
  of 
  ramifying, 
  intertwining 
  tubules, 
  of 
  a 
  diameter 
  

  

  