﻿16 
  S. 
  A. 
  TULLBERG, 
  GRAPTOLITES 
  DESCRIBED 
  BY 
  HISINGER. 
  

  

  downwards 
  because 
  of 
  the 
  inclination 
  of 
  the 
  long 
  and 
  nar- 
  

   row, 
  almost 
  equally 
  broad 
  hydrothecae. 
  How 
  far 
  C. 
  cometa 
  

   also 
  lias 
  a 
  transversally 
  striated 
  membrane, 
  I 
  do 
  not 
  know. 
  

   This 
  fact 
  can 
  only 
  be 
  observed 
  on 
  very 
  well 
  preserved 
  exana- 
  

   ples. 
  On 
  those 
  of 
  C. 
  folium 
  from 
  Scania 
  it 
  is 
  apparent, 
  also 
  

   that 
  on 
  splitting 
  a 
  piece 
  of 
  shale 
  the 
  virgiila 
  is 
  scen 
  on 
  the 
  

   one 
  half 
  only 
  of 
  the 
  divided 
  specimen, 
  and 
  that 
  the 
  separa- 
  

   ting 
  walls 
  issue 
  from 
  this 
  virgula 
  alternately 
  at 
  determined 
  

   distances; 
  the 
  other 
  half 
  is 
  deprived 
  of 
  virgvila; 
  the 
  separa- 
  

   ting 
  walls 
  of 
  the 
  hydrotheca 
  are 
  carried 
  forward 
  completely 
  

   to 
  the 
  middle 
  line, 
  bxit 
  leave 
  between 
  them 
  an 
  oblong, 
  narrow 
  

   space, 
  which 
  is 
  occupied 
  by 
  the 
  common 
  canal. 
  From 
  this 
  

   it 
  is 
  evident 
  that 
  the 
  interiör 
  structure 
  deviates 
  in 
  a 
  high 
  

   degree 
  from 
  that 
  of 
  the 
  Diplograptidae, 
  where 
  there 
  is 
  a 
  

   separating 
  membrane, 
  a 
  septnm 
  between 
  two 
  common 
  canals. 
  

   The 
  genus 
  Cephalograptus 
  thus 
  belongs 
  to 
  the 
  large 
  section 
  

   of 
  Graptolites, 
  which 
  from 
  one 
  common 
  canal 
  develop 
  two 
  

   series 
  of 
  hydrothecae; 
  its 
  nearest 
  affinities 
  are 
  with 
  the 
  

   Retiulitidae. 
  

  

  This 
  species 
  occurs, 
  at 
  Furudal 
  in 
  Dalecarlia, 
  and 
  at 
  

   Kongslena 
  in 
  Vestrogothia, 
  also 
  in 
  Scania 
  at 
  Röstånga 
  and 
  

   Kiviks-Esperöd. 
  

  

  No. 
  6. 
  In 
  Supplementum 
  secundum 
  Hisinger 
  describes 
  

   and 
  delineates 
  two 
  Graptolites 
  from 
  Fågelsång. 
  

  

  »Tab. 
  XXX 
  VII. 
  Fig 
  3. 
  PWono^ifs? 
  ^émmws 
  (Nob.) 
  duplex, 
  

   e 
  trunco 
  communi 
  egrediens. 
  — 
  Loc. 
  In 
  schisto 
  transitionis 
  

   argillaceo 
  ad 
  Fågelsång, 
  Scaniae 
  ; 
  cum 
  Prionoto 
  Scalari, 
  minus 
  

   frequens.» 
  

  

  Hisinger's 
  type 
  specimen 
  is 
  a 
  fragment 
  of 
  the 
  proximal 
  

   part 
  of 
  a 
  Didymograptiis, 
  belonging 
  to 
  the 
  well 
  known 
  D. 
  

   Murcldsoni- 
  ty 
  ^e. 
  As 
  Hisinger's 
  form 
  can 
  not 
  be 
  separated 
  

   as 
  a 
  distmct 
  species, 
  I 
  propose 
  to 
  place 
  it 
  as 
  a 
  subspecies 
  

   of 
  this 
  polymorphous 
  type: 
  

  

  Didymograptus 
  Murchisoni 
  Beck. 
  *gemmiis. 
  His. 
  

  

  Plate 
  III, 
  fig. 
  5—10. 
  

  

  Prionotus? 
  geminus 
  HiS. 
  1. 
  c. 
  — 
  BOECK, 
  Bemferkninger 
  angaaende 
  Grap- 
  

   toliterne, 
  Christiania 
  1851, 
  fig. 
  24. 
  — 
  Gi-aptolithus 
  ffe7ninus 
  Scrabei^berg, 
  

   Ueber 
  Graptolithen, 
  Breslau 
  1850, 
  p. 
  13, 
  pl. 
  I, 
  fig. 
  1— 
  ? 
  Did. 
  Murchisoni 
  

  

  