﻿6 
  S. 
  A. 
  TULLBERG, 
  GRAPTOLITES 
  DESCRIBED 
  BY 
  HISINGER. 
  

  

  In 
  tlie 
  twelfth 
  edition 
  of 
  the 
  Systema 
  Naturae, 
  Tomus 
  

   III, 
  Holmiae 
  1768, 
  p. 
  174, 
  Linné 
  for 
  the 
  first 
  time 
  makes 
  

   use 
  of 
  the 
  specific 
  denominations 
  »sagittarius» 
  and 
  »scalaris». 
  

  

  His 
  numero 
  6 
  is 
  »sagittarins 
  ; 
  Graptolithus 
  impressionibus 
  

   sagittatis. 
  — 
  Anonymum. 
  Volkam. 
  Siles. 
  3. 
  p. 
  332, 
  t. 
  4, 
  fig. 
  

   6. 
  — 
  Habitat 
  in 
  cote. 
  — 
  Hoc 
  impressionibus 
  irabricatis, 
  sa- 
  

   gittatis 
  absque 
  pedicello, 
  regnlariter 
  dispositis, 
  apice 
  eandem 
  

   plagam 
  respicientibus». 
  — 
  In 
  the 
  work 
  of 
  Yolkman, 
  »Silesia 
  

   subterranea», 
  the 
  figure 
  and 
  description, 
  cited 
  hy 
  Linné, 
  do 
  not 
  

   refer 
  to 
  a 
  graptolite, 
  but 
  to 
  a 
  wholly 
  diiferent 
  fossil, 
  namely 
  a 
  

   Sigillaria. 
  Thus 
  it 
  is 
  evident, 
  that 
  it 
  is 
  now 
  impossible 
  to 
  

   say, 
  what 
  Linné 
  referred 
  to 
  under 
  the 
  name 
  »sagittarius». 
  ■ 
  

  

  His 
  numero 
  7 
  is 
  »scalaris; 
  Graptolithus 
  lineam 
  striasque 
  

   transversas 
  referens. 
  — 
  Graptolithus. 
  It. 
  Scan. 
  147, 
  f. 
  147. 
  — 
  

   Habitat 
  in 
  schisto 
  comrauni 
  Scaniae«. 
  — 
  

  

  Under 
  this 
  name 
  consequently 
  Linné 
  alludes 
  to 
  the 
  form 
  

   of 
  Climacograptus, 
  already 
  mentioned, 
  which 
  occurs 
  at 
  Bybjer 
  

   in 
  the 
  zone 
  of 
  Monograptus 
  gregarius. 
  

  

  G. 
  Wahlenberg 
  ^) 
  held 
  the 
  opinion, 
  that 
  the 
  graptolites 
  

   are 
  Orthoceratites. 
  The 
  form, 
  which 
  he 
  chiefly 
  seems 
  to 
  have 
  

   had 
  in 
  view, 
  is 
  Climacograptus 
  scalaris 
  L., 
  which 
  he 
  was 
  ac- 
  

   quainted 
  with 
  from 
  the 
  upper 
  graptolitic 
  shales 
  in 
  Westro- 
  

   gothia, 
  and 
  which 
  he 
  denominates 
  : 
  Orthoceratites 
  tenuis. 
  — 
  

   His 
  description 
  runs 
  as 
  follows: 
  »Ut 
  plurimum 
  latitudinem 
  

   vix 
  lineae 
  et 
  longitudinem 
  unciae 
  habet 
  formamque 
  linearem. 
  

   Articuli 
  ejus 
  interdum 
  a 
  se 
  invicem 
  soluti 
  et 
  inversi 
  sunt 
  

   ita, 
  ut 
  circulos 
  seraine 
  sinapios 
  minores 
  in 
  schisto 
  expres- 
  

   serint. 
  Typi 
  longitudinalis 
  loci 
  siphonis 
  nervum 
  medullarem 
  

   evidentem 
  ostenduut, 
  ad 
  ejus 
  latera 
  dissepimenta 
  saepe 
  op- 
  

   posite 
  tamquam 
  in 
  situ 
  naturali 
  expressa 
  sunt, 
  sed 
  interdum 
  

   situ 
  suo 
  alternant, 
  quod 
  quidem 
  sive 
  a 
  commotione, 
  sive 
  ab 
  

   obliquitate 
  effectum 
  esse 
  potest». 
  He 
  says 
  that 
  such 
  are 
  to 
  

   be 
  found 
  also 
  in 
  Scania, 
  and 
  in 
  Dalecarlia 
  at 
  Osmundberg 
  

   and 
  at 
  Furudal. 
  

  

  He 
  further 
  writes: 
  »Inter 
  omnes 
  hos 
  Graptolithos 
  scalares 
  

   tam 
  vario 
  modo 
  expressos 
  saepius 
  adsunt 
  sic 
  dicti 
  Graptolithi 
  

   sagittarii 
  Linnaei, 
  quorum 
  natura 
  et 
  origo 
  adhuc 
  magis 
  incog- 
  

   nitae 
  fuerunt, 
  sed 
  jam 
  ulterius 
  vix 
  dubitamus, 
  quin 
  ab 
  iisdem 
  

   Orthoceratitis 
  minutis 
  destructione 
  peculiari 
  örtum 
  habeant». 
  

  

  ') 
  >Petrificata 
  Telluris 
  Svecanae^, 
  1. 
  c. 
  

  

  