﻿128 
  DE. 
  G. 
  J. 
  HINBE 
  ON 
  ARCHJEOCTATHTJS 
  AND 
  OTHER 
  GENERA 
  

  

  In 
  1880* 
  Prof. 
  Ferd. 
  Bomer 
  treats 
  at 
  some 
  length 
  of 
  the 
  charac- 
  

   ters 
  of 
  Archceocyaihus, 
  and 
  gives 
  a 
  minute 
  and 
  full 
  description, 
  accom- 
  

   panied 
  by 
  figures, 
  of 
  a 
  new 
  species, 
  A. 
  marianus, 
  from 
  the 
  Cambrian 
  

   strata 
  of 
  the 
  Sierra 
  Morena, 
  Spain. 
  This 
  form 
  shows 
  the 
  same 
  re- 
  

   markable 
  feature 
  of 
  obliquely 
  extended 
  canals 
  opening 
  into 
  the 
  central 
  

   cup, 
  which 
  Meek 
  describes 
  in 
  EihmophyUum 
  Whitneyi. 
  Homer 
  

   accepts 
  Billings's 
  generic 
  diagnosis, 
  and 
  places 
  A. 
  minganensis 
  and 
  

   A. 
  profundus 
  as 
  the 
  typical 
  forms 
  ; 
  the 
  spicules 
  found 
  in 
  connexion 
  

   with 
  the 
  first 
  named 
  are 
  regarded 
  as 
  accidental 
  inclusions 
  from 
  

   disintegrated 
  sponges. 
  The 
  genus, 
  however, 
  is 
  considered 
  to 
  be 
  

   allied 
  to 
  Receptaculites, 
  Defr., 
  and 
  the 
  perforated 
  vertical 
  radiating 
  

   septa 
  are 
  compared 
  with 
  the 
  so-called 
  vertical 
  pillars 
  in 
  this 
  latter 
  

   genus. 
  

  

  In 
  the 
  Cambrian 
  strata 
  of 
  the 
  Island 
  of 
  Sardinia, 
  Archceocyaihus 
  

   and 
  its 
  allied 
  forms 
  are 
  extraordinarily 
  abundant 
  ; 
  they 
  were 
  at 
  

   first 
  regarded 
  as 
  Corals 
  allied 
  to 
  Cyathophyllum, 
  but 
  afterwards 
  

   Prof. 
  Meneghini 
  f 
  recognized 
  their 
  relationship 
  to 
  Archceocyathus. 
  

  

  To 
  Dr. 
  J. 
  Gr. 
  Bornemann, 
  however, 
  is 
  due 
  the 
  merit 
  of 
  making 
  

   an 
  extensive 
  collection 
  of 
  these 
  fossils 
  in 
  Sardinia, 
  and 
  subjecting 
  

   them 
  to 
  microscopic 
  study 
  J. 
  Preliminary 
  notices 
  of 
  the 
  results 
  

   appeared 
  in 
  various 
  publications 
  between 
  1881 
  and 
  1884, 
  and 
  

   full 
  descriptions 
  and 
  figures 
  in 
  1886 
  §. 
  The 
  author 
  included 
  in 
  

   Archceocyaihus 
  proper, 
  forms 
  with 
  a 
  finely 
  porous 
  outer 
  surface 
  and 
  

   a 
  coarsely 
  perforated 
  inner 
  surface 
  and 
  radial 
  vertical 
  septa 
  dividing 
  

   the 
  interspace 
  into 
  longitudinal 
  compartments, 
  thus 
  mainly 
  of 
  the 
  

   type 
  of 
  A. 
  profundus, 
  Bill. 
  A 
  second 
  genus, 
  named 
  Coscinocyathus, 
  

   comprised 
  forms 
  which, 
  in 
  addition 
  to 
  the 
  vertical 
  septa, 
  are 
  furnished 
  

   with 
  regular 
  transverse 
  partitions 
  or 
  tabulse, 
  thus 
  further 
  subdivid- 
  

   ing 
  the 
  vertical 
  compartments. 
  In 
  a 
  third 
  genus, 
  Anihomorpfha, 
  

   irregular 
  delicate 
  transverse 
  lamellae 
  are 
  developed 
  between 
  robust 
  

   vertical 
  septa, 
  and 
  the 
  walls 
  and 
  septa 
  are 
  further 
  of 
  a 
  non-perforate 
  

   character. 
  Another 
  provisional 
  genus, 
  Protop>haretra, 
  includes 
  forms 
  

   composed 
  of 
  fibres 
  of 
  homogeneous 
  calcite. 
  These 
  are 
  regarded 
  as 
  

   merely 
  the 
  vegetative 
  developmental 
  stage 
  of 
  Archceocyaihus, 
  from 
  

   which 
  the 
  perfect 
  cup-like 
  forms 
  of 
  this 
  genus 
  are 
  produced. 
  These 
  

   various 
  genera 
  are 
  placed 
  by 
  Dr. 
  Bornemann 
  as 
  a 
  special 
  division 
  of 
  

   the 
  class 
  Ccelenterata, 
  the 
  Archseocyathinse, 
  in 
  the 
  vicinity 
  of 
  

   Sponges, 
  Anthozoa, 
  and 
  Medusoid 
  polyps. 
  

  

  Nearly 
  contemporaneous 
  with 
  the 
  final 
  memoir 
  of 
  Bornemann, 
  an 
  

   extended 
  notice 
  of 
  the 
  same 
  group 
  of 
  fossils 
  was 
  given 
  by 
  Mr. 
  C. 
  D. 
  

   Walcott|| 
  . 
  This 
  author 
  does 
  not 
  recognize 
  the 
  amended 
  descrip- 
  

  

  * 
  Lethsea 
  Palaeozoica 
  (1880), 
  pp. 
  298-303. 
  

  

  t 
  Atti 
  della 
  Societa 
  Toscana 
  di 
  Sc. 
  Nat. 
  (1881), 
  p. 
  201. 
  

  

  \ 
  Compte 
  rendu 
  du 
  Congres 
  geologique 
  international 
  de 
  Bologne, 
  1881, 
  

   p. 
  221 
  ; 
  Zeitschrift 
  d. 
  deutsch. 
  geol. 
  Gesellsch. 
  xxxv. 
  (1883), 
  pp. 
  270-274 
  ; 
  

   ibid, 
  xxxvi. 
  (1884), 
  pp. 
  399, 
  400 
  ; 
  ibid. 
  pp. 
  702-706. 
  

  

  § 
  " 
  Die 
  Versteinerungen 
  des 
  Cambrischen 
  Schichtensysterns 
  der 
  Insel 
  Sar- 
  

   dimen," 
  No-va 
  Acta 
  der 
  kais. 
  Leop.-Carol. 
  deutschen 
  Akad. 
  der 
  Naturforscher, 
  

   Bd. 
  li. 
  No. 
  i. 
  pp. 
  28-78, 
  tab. 
  v.-xxxiii. 
  

  

  || 
  " 
  Second 
  Contribution 
  to 
  the 
  Studies 
  on 
  the 
  Cambrian 
  Faunas 
  of 
  North 
  

   America," 
  .Bulletin 
  of 
  the 
  United 
  States 
  Geological 
  Survey, 
  No. 
  30 
  (1886), 
  

   pp. 
  72-89, 
  pis. 
  i.- 
  v. 
  

  

  