﻿NEWTON: 
  ON 
  ATURIA 
  ATUSI. 
  161 
  

  

  Nautilus 
  ziczac, 
  J. 
  E. 
  [Tenison] 
  Woods, 
  " 
  Geological 
  Observations 
  

  

  in 
  Soutli 
  Australia," 
  1862, 
  p. 
  83, 
  text-figure. 
  

   Aturia 
  austraUs, 
  McCov, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  iii, 
  vol. 
  xx, 
  

  

  1867, 
  pp. 
  191-2. 
  

  

  — 
  aturi, 
  Bellardi, 
  Moll. 
  Terz. 
  Piemonte, 
  vol. 
  i, 
  1872, 
  pp. 
  23-4; 
  

  

  Hoernes, 
  Jahrb. 
  Geol. 
  lieichs., 
  vol. 
  xxv, 
  1875, 
  p. 
  344, 
  pi. 
  xii, 
  

   figs. 
  5, 
  6. 
  

  

  — 
  ziczac 
  (Sowerby, 
  sp.), 
  var. 
  australis, 
  McCoy, 
  Prod. 
  Pal. 
  Victoria, 
  

  

  Geol. 
  Surv. 
  Victoria, 
  dec. 
  iii, 
  1876, 
  pp. 
  21-2, 
  pi. 
  xxiv, 
  figs. 
  1-5. 
  

   Nautilus 
  [Aturia) 
  aturi, 
  Fuchs, 
  Sitz. 
  k. 
  Akad. 
  Wiss. 
  Wieu, 
  

  

  vol. 
  Ixxiii, 
  1876, 
  p. 
  68, 
  pi. 
  i, 
  figs. 
  8, 
  9. 
  

   Aturia 
  ziczac, 
  Johnston, 
  Geology 
  of 
  Tasmania, 
  1888, 
  p. 
  261. 
  

  

  — 
  aturi 
  and 
  var. 
  australis, 
  Foord, 
  Cat. 
  Foss. 
  Cephalopoda 
  Erit. 
  

  

  Mus. 
  (Nat. 
  Hist), 
  1891, 
  pt. 
  ii, 
  pp. 
  351-5. 
  

  

  — 
  cf. 
  aturi, 
  Mciricke, 
  Neues 
  Jalirb., 
  Beil.-.Bd. 
  x, 
  1896, 
  p. 
  553. 
  

  

  — 
  australis, 
  Dennant 
  & 
  Kitson, 
  llec. 
  Geol. 
  8urv. 
  Victoria, 
  vol. 
  i, 
  

  

  1903, 
  p. 
  94. 
  

  

  — 
  aturi, 
  Sacco, 
  Moll. 
  Terz. 
  Piemonte, 
  vol. 
  xxx, 
  1904, 
  pp. 
  6-7, 
  

  

  pi. 
  i, 
  figs. 
  15-18, 
  pi. 
  ii, 
  figs. 
  1-3. 
  

  

  — 
  ziczac, 
  var. 
  australis, 
  Hamilton, 
  Trans. 
  New 
  Zealand 
  Inst>, 
  

  

  vol, 
  xxxvi, 
  1904, 
  p. 
  466, 
  pis. 
  xxxvii 
  and 
  xxxviii. 
  

  

  — 
  cf. 
  aturi, 
  Lemoine, 
  Etudes 
  Geol. 
  Nord 
  Madagascar, 
  1906, 
  p. 
  267. 
  

  

  — 
  australis, 
  Chapman, 
  Mem. 
  Nat. 
  Mus. 
  Melbourne, 
  No. 
  5, 
  1914, 
  

  

  p. 
  15. 
  

  

  — 
  aturi, 
  R. 
  13. 
  Newton, 
  Sltli 
  Kept. 
  Brit. 
  Assoc. 
  Australia, 
  1914 
  

  

  (1915), 
  p. 
  375. 
  

  

  — 
  australis, 
  Chapman, 
  Proc. 
  11. 
  Soc. 
  Victoria, 
  N.s., 
  vol. 
  xxvii, 
  1915, 
  

  

  pp. 
  351-53, 
  pi. 
  iii, 
  fig. 
  2. 
  

  

  — 
  australis, 
  Jutson 
  & 
  Himpson, 
  Ann. 
  Progr. 
  llept. 
  [1915] 
  Geol. 
  

  

  Surv. 
  W. 
  Australia, 
  1916, 
  p. 
  124. 
  

  

  — 
  aturi, 
  Fourtau, 
  Rep. 
  Geol. 
  Surv. 
  Dept. 
  Egypt, 
  1916, 
  p. 
  94, 
  

  

  pi. 
  xi, 
  fig. 
  7. 
  

  

  The 
  fossil 
  consists 
  of 
  a 
  natural 
  cast 
  in 
  a 
  yellowish 
  sandstone 
  

   of 
  a 
  completely 
  involute 
  shell, 
  thus 
  resembling 
  the 
  Nautilus 
  of 
  

   modern 
  seas. 
  

  

  It 
  exhibits 
  the 
  contour 
  of 
  an 
  almost 
  complete 
  body-whorl 
  with 
  an 
  

   imperfect 
  septal 
  region, 
  which 
  on 
  one 
  side 
  shows 
  some 
  effects 
  of 
  

   crushing 
  during 
  the 
  process 
  of 
  fossilization. 
  It 
  belonged 
  to 
  a 
  shell 
  

   that 
  was 
  discoid, 
  flattened, 
  narrowly 
  rounded 
  at 
  the 
  periphery, 
  and 
  

   possessed 
  an 
  aperture 
  of 
  greater 
  height 
  than 
  width. 
  The 
  marginal 
  

   sides 
  of 
  the 
  aperture 
  just 
  above 
  the 
  central 
  region 
  have 
  a 
  slightly 
  

   elevated 
  curvature 
  beneath 
  a 
  shallow 
  area 
  of 
  excavation 
  containing 
  

   the 
  umbilical 
  centre. 
  The 
  body-chamber 
  is 
  extensive, 
  its 
  height 
  

   being 
  about 
  one-third 
  in 
  excess 
  of 
  the 
  Avidth 
  measurement, 
  while 
  the 
  

   central 
  lateral 
  region 
  is 
  depressed 
  until 
  the 
  deeply 
  sloping 
  curvature 
  

   is 
  reached, 
  which 
  leads 
  to 
  the 
  rounded 
  peripheial 
  margin. 
  

  

  The 
  septal 
  region 
  is 
  so 
  imperfect 
  that 
  only 
  one 
  or 
  two 
  septa 
  

   immediately 
  contiguous 
  to 
  the 
  body-chamber 
  are 
  preserved, 
  altliough 
  

   they 
  possess 
  the 
  strongly 
  curved 
  sutures, 
  characteristic 
  of 
  the 
  genus 
  

   Aturia, 
  while 
  one 
  of 
  the 
  angular 
  lateral 
  lobes 
  is 
  distinctly 
  marked 
  

  

  