﻿210 
  

  

  Mr. 
  H. 
  J. 
  Carter 
  on 
  the 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VII. 
  

  

  Fig. 
  1. 
  Athorybia 
  calif 
  arnica. 
  A 
  view 
  from 
  the 
  side, 
  showing 
  the 
  hydro- 
  

   phyl'lia 
  more 
  or 
  less 
  expanded 
  ; 
  tentacles 
  aud 
  polypite 
  extended. 
  

   Drawn 
  from 
  a 
  living 
  specimen. 
  

  

  Fig. 
  2. 
  Single 
  tentacular 
  knob 
  very 
  much 
  magnified. 
  

  

  a. 
  Apex 
  of 
  sacculus. 
  

   /. 
  Float. 
  

  

  he. 
  Ilvdrophyllium. 
  

   i. 
  Involucrum. 
  

   p. 
  Polypite. 
  

   pd. 
  Peduncle 
  of 
  the 
  

   knob. 
  

  

  Cambridge, 
  U. 
  S. 
  A., 
  

   November, 
  1888. 
  

  

  Lettering. 
  

  

  s. 
  Sacculus. 
  

   t. 
  Tentacle. 
  

   tf. 
  Terminal 
  filament. 
  

   tk. 
  Tentacular 
  knob. 
  

   ts. 
  Taster, 
  

   tentacular 
  to. 
  Terminal 
  vesicle. 
  

  

  XXII. 
  — 
  Further 
  Observations 
  on 
  the 
  For 
  amini 
  feral 
  Genus 
  

   Orbitoides 
  ofd'Orbigmj. 
  By 
  H. 
  J. 
  Carter, 
  F.R.S. 
  &c. 
  

  

  Since 
  my 
  observations 
  on 
  the 
  genus 
  Orbitoides 
  of 
  d'Orbigny 
  

   were 
  published 
  (' 
  Annals,' 
  1 
  888, 
  vol. 
  ii. 
  p. 
  439) 
  I 
  have 
  re- 
  

   ceived 
  several 
  type 
  specimens 
  of 
  Orbitoides 
  media 
  from 
  the 
  

   Upper 
  Chalk 
  in 
  the 
  south-west 
  of 
  France, 
  which, 
  being 
  the 
  

   same 
  in 
  specific 
  characters 
  as 
  those 
  from 
  the 
  Chalk 
  of 
  Maes- 
  

   tricht 
  that 
  I 
  had 
  already 
  described 
  {op. 
  et 
  toe. 
  cit. 
  p. 
  445), 
  

   have 
  enabled 
  me 
  personally 
  to 
  compare 
  the 
  two, 
  which 
  pre- 
  

   viously 
  I 
  had 
  only 
  been 
  able 
  to 
  effect 
  by 
  quoting 
  M. 
  le 
  

   Vicomte 
  d'Arehiac's 
  description 
  of 
  this 
  fossil 
  under 
  the 
  name 
  

   of 
  "Orbitolites 
  media''' 
  (ib. 
  p. 
  446). 
  

  

  For 
  this 
  welcome 
  present 
  1 
  am 
  indebted 
  to 
  my 
  kind 
  friend 
  

   Mons. 
  G. 
  Bcrthelin, 
  formerly 
  of 
  Nantes, 
  now 
  residing 
  in 
  

   Paris, 
  whose 
  valuable 
  contributions 
  to 
  the 
  knowledge 
  of 
  

   Foraminifera 
  are 
  well 
  known, 
  and 
  who, 
  on 
  learning 
  from 
  the 
  

   paper 
  to 
  which 
  I 
  have 
  alluded 
  that 
  I 
  had 
  no 
  specimens 
  of 
  

   " 
  Orbitoides 
  media" 
  from 
  France 
  to 
  compare 
  with 
  d'Orbigny's 
  

   illustrations, 
  immediately 
  sent 
  me 
  twenty, 
  labelled 
  "Orbi- 
  

   toides 
  media, 
  d'Archiac, 
  sp. 
  Dordonien 
  (Craie 
  super.), 
  

   Meschers 
  (Charente-Inf.), 
  pies 
  Royan." 
  These 
  appear 
  from 
  

   their 
  smallness, 
  varying 
  from 
  5-48ths 
  to 
  6-24ths 
  inch 
  in 
  hori- 
  

   zontal 
  diameter, 
  to 
  belong 
  to 
  the 
  lesser 
  size 
  mentioned 
  by 
  

   d'Archiac 
  as 
  probably 
  being 
  young 
  forms 
  of 
  his 
  larger 
  one 
  

   rather 
  than 
  a 
  different 
  species, 
  which 
  measured 
  " 
  50 
  millim." 
  

   in 
  diameter 
  (op. 
  et 
  he. 
  cit.). 
  

  

  