﻿48 
  PllOCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIEIT, 
  

  

  dorsal 
  edges 
  of 
  the 
  septa. 
  This 
  appears 
  to 
  us 
  to 
  be 
  the 
  aspect 
  

   presented 
  by 
  Dr. 
  Hind's 
  specimen, 
  for 
  notwithstanding 
  its 
  size 
  

   (22-5 
  mm. 
  in 
  diameter) 
  the 
  fossil 
  has 
  evidently 
  lost 
  not 
  only 
  its 
  body- 
  

   chamber 
  but 
  also 
  nearly 
  a 
  complete 
  whorl 
  of 
  the 
  septate 
  part 
  of 
  the 
  

   shell, 
  whilst 
  the 
  floor 
  of 
  the 
  missing 
  septated 
  portion 
  and 
  that 
  of 
  the 
  

   posterior 
  portion 
  of 
  the 
  body-chamber 
  still 
  adheres 
  to 
  the 
  penultimate 
  

   -whorl. 
  We 
  venture 
  to 
  think, 
  then, 
  that 
  Dr. 
  Hind's 
  description 
  is 
  

   based 
  upon 
  a 
  specimen 
  which 
  has 
  lost 
  its 
  body-chamber 
  and 
  nearly 
  

   a 
  complete 
  whorl 
  of 
  its 
  septated 
  part, 
  whilst 
  De 
  Koninck's 
  description 
  

   refers 
  to 
  a 
  shell 
  possessing 
  the 
  outer 
  whorl, 
  the 
  aspect 
  of 
  the 
  shell 
  in 
  

   these 
  two 
  conditions 
  being 
  entirely 
  different. 
  

  

  Thus 
  De 
  Koninck 
  describes 
  the 
  peripheral 
  arc 
  as 
  regularly 
  convex 
  

   [regulierement 
  arquee), 
  the 
  aperture 
  of 
  the 
  shell 
  as 
  semilunar 
  and 
  

   nearly 
  as 
  wide 
  as 
  high, 
  whilst 
  Dr. 
  Hind 
  states 
  that 
  "the 
  periphery 
  is 
  

   broad, 
  gently 
  convex, 
  separated 
  on 
  each 
  side 
  from 
  an 
  inflated 
  margin 
  

   by 
  a 
  longitudinal 
  sulcus", 
  and 
  that 
  "below 
  the 
  rolled 
  margin 
  the 
  

   side 
  of 
  the 
  whorl 
  is 
  flattened 
  and 
  depressed 
  ", 
  De 
  Koninck's 
  

   description 
  evidently 
  referring 
  to 
  the 
  outer 
  whorl 
  of 
  the 
  shell, 
  and 
  

   that 
  of 
  Dr. 
  Hind 
  to 
  the 
  penultimate 
  whorl 
  after 
  the 
  removal 
  of 
  the 
  

   outer 
  whorl. 
  

  

  Again, 
  De 
  Koninck 
  mentions 
  only 
  incidentally 
  the 
  nature 
  of 
  the 
  

   surface 
  of 
  the 
  test, 
  observing, 
  in 
  comparing 
  his 
  species 
  with 
  Phillips' 
  

   Goniatites 
  stenolohis, 
  that 
  in 
  Gotiiatiles 
  stenolohis 
  one 
  never 
  meets 
  with 
  

   the 
  vesicular 
  matter 
  with 
  which 
  the 
  surface 
  of 
  Goniatites 
  vesiculifer 
  is 
  

   covered 
  (charge). 
  

  

  Now 
  Dr. 
  Hind 
  describes 
  the 
  'ornamentation' 
  as 
  follows: 
  "The 
  

   sides 
  of 
  the 
  shell 
  are 
  adorned 
  by 
  a 
  number 
  of 
  small, 
  elevated 
  curved 
  

   radiating 
  costoe, 
  which 
  pass 
  from 
  the 
  edge 
  of 
  the 
  umbilicus 
  and 
  

   become 
  lost 
  on 
  the 
  swollen 
  band. 
  Between 
  the 
  ribs 
  the 
  lateral 
  surface 
  

   is 
  covered 
  with 
  numerous 
  regular 
  longitudinal 
  lines. 
  The 
  surface 
  of 
  

   the 
  inflated 
  partis 
  finely 
  punctate. 
  Test 
  thin." 
  A 
  close 
  examination 
  

   of 
  the 
  fossil 
  shows 
  that 
  the 
  surface 
  of 
  each 
  longitudinal 
  band 
  is 
  

   reticulated, 
  these 
  reticulations 
  passing 
  on 
  the 
  peripheral 
  side 
  into 
  fine 
  

   irregular 
  transverse 
  strite, 
  and 
  on 
  the 
  lateral 
  area 
  into 
  fine 
  more 
  

   or 
  less 
  regular 
  transverse 
  striae 
  crossed 
  by 
  somewhat 
  coarser 
  and 
  

   fairly-regular 
  longitudinal 
  (spiral) 
  strife, 
  giving 
  the 
  surface 
  between 
  

   the 
  band 
  and 
  the 
  edge 
  of 
  the 
  umbilicus 
  a 
  finely-cancellated 
  appearance, 
  

   the 
  longitudinal 
  lines 
  being 
  somewhat 
  stronger 
  than 
  the 
  transverse. 
  

   The 
  reticulated 
  and 
  the 
  cancellated 
  surfaces 
  are 
  crossed 
  at 
  fairly 
  

   regular 
  intervals 
  by 
  the 
  dorsal 
  edges 
  of 
  the 
  septa 
  of 
  the 
  outer 
  whorl, 
  

   which 
  has 
  been 
  suhsequently 
  removed. 
  Our 
  explanation, 
  therefore, 
  of 
  

   the 
  ' 
  ornamentation 
  ' 
  described 
  by 
  Dr. 
  Hind 
  is 
  that 
  it 
  refers 
  to 
  the 
  

   floor 
  of 
  the 
  outer 
  whorl 
  as 
  it 
  appears 
  attached 
  to 
  the 
  penultimate 
  

   whorl 
  when 
  the 
  rest 
  of 
  the 
  whorl 
  is 
  removed, 
  the 
  so-called 
  ' 
  curved 
  

   radiating 
  costse 
  ' 
  ^ 
  on 
  the 
  side 
  of 
  the 
  shell 
  being 
  the 
  dorsal 
  edges 
  

   of 
  the 
  septa 
  of 
  the 
  missing 
  outer 
  whorl. 
  Having 
  submitted 
  this 
  

   interpretation 
  of 
  the 
  feature 
  of 
  the 
  specimen 
  to 
  Dr. 
  Hind 
  it 
  is 
  

  

  ^ 
  It 
  may 
  also 
  be 
  pointed 
  out 
  that 
  these 
  costae 
  constitute 
  the 
  broad 
  curve 
  on 
  

   each 
  side 
  in 
  the 
  drawing 
  of 
  the 
  suture-line 
  given 
  by 
  Dr. 
  Hind. 
  

  

  