﻿58 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL. 
  MUSEUM 
  vol.67 
  

  

  The 
  young 
  zoaria 
  are 
  berenicoid, 
  like 
  the 
  one 
  we 
  have 
  figured. 
  

   Waters 
  discovered 
  the 
  ovicell 
  and 
  has 
  sent 
  us 
  a 
  drawing, 
  which 
  we 
  

   reproduce. 
  The 
  ovicell 
  is 
  an 
  ovoid 
  capsule 
  with 
  limited 
  outlines, 
  

   interrupting 
  the 
  fascicles. 
  It 
  belongs 
  to 
  the 
  group 
  of 
  the 
  Cytisidae, 
  

   although 
  somewhat 
  smaller. 
  

  

  This 
  species 
  has 
  been 
  chosen 
  as 
  the 
  type 
  of 
  the 
  genus 
  Actinopora 
  

   D'Orbigny, 
  1853, 
  by 
  Gregory, 
  1909. 
  The 
  fascicles 
  are 
  multiserial. 
  

   Canu, 
  1917, 
  discovered 
  the 
  ovicell 
  of 
  Actinopora 
  complanata 
  Roemer, 
  

   1840 
  ( 
  = 
  organisans 
  D'Orbigny, 
  1851). 
  It 
  is 
  of 
  the 
  type 
  Plagioecia. 
  

   The 
  fascicles 
  are 
  uniserial. 
  

  

  Under 
  these 
  circumstances 
  it 
  is 
  necessary, 
  then, 
  to 
  maintain 
  in 
  

   the 
  Cytisidae 
  (or 
  Theonoidae) 
  the 
  multiserial 
  species 
  (genus 
  Actino- 
  

   pora) 
  and 
  in 
  the 
  Plagioeciidae 
  the 
  uniserial 
  species 
  (genus 
  Discotubi- 
  

   gera) 
  . 
  

  

  We 
  still 
  maintain 
  the 
  genus 
  Desmeplagoecia, 
  as 
  it 
  is 
  not 
  certain 
  

   that 
  all 
  of 
  the 
  Discotubigera 
  have 
  the 
  same 
  ovicell. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Valangian) 
  : 
  Sainte-Croix 
  and 
  

   Villers-le-Lac, 
  Switzerland. 
  

  

  Plesiotype.—C&t. 
  No. 
  69906, 
  U.S.N.M. 
  

  

  Genus 
  MULTITUBIGERA 
  D'Orbigny, 
  1853 
  

  

  1853. 
  Multitubigera 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  Cretace, 
  vol. 
  5, 
  

   p. 
  767. 
  

  

  Theonoidae 
  with 
  a 
  compound 
  zoarium 
  composed 
  of 
  many 
  confluent 
  

   Actinopora. 
  

  

  Genotype. 
  — 
  Multitubigera 
  gregaria 
  D'Orbigny, 
  1850. 
  Cretaceous. 
  

  

  MULTITUBIGERA 
  CAMPICHEANA 
  D'Orbigny, 
  1853 
  

  

  Plate 
  6, 
  figs. 
  4-8 
  

  

  1853. 
  Multitubigera 
  campicheana 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  

   Cretace, 
  vol. 
  5, 
  p. 
  768, 
  pi. 
  763, 
  figs. 
  10-13. 
  

  

  The 
  ovicell 
  is 
  a 
  small 
  ovoid 
  capsule 
  with 
  definite 
  outlines, 
  inter- 
  

   rupting 
  an 
  intermediate 
  fascicle 
  between 
  two 
  other 
  complete 
  ones. 
  

   It 
  is 
  analogous 
  to 
  that 
  of 
  Actinopora 
  stellata 
  Koch 
  and 
  Dunker, 
  1837; 
  

   it 
  belongs 
  to 
  the 
  group 
  of 
  the 
  Cytisidae, 
  although 
  a 
  little 
  smaller. 
  

   The 
  zoaria 
  of 
  this 
  genus 
  are 
  formed 
  of 
  conliuent 
  Actinopora. 
  

  

  The 
  general 
  form 
  is 
  quite 
  variable. 
  Very 
  often 
  the 
  zoarium 
  is 
  

   flabelliform 
  and 
  formed 
  of 
  two 
  incomplete 
  subcolonies 
  united 
  by 
  

   their 
  dorsal. 
  Again 
  the 
  zoarium 
  remains 
  flabelliform 
  and 
  formed 
  

   of 
  three 
  disks 
  of 
  Actinopora. 
  Finally, 
  the 
  zoarium 
  may 
  form 
  an 
  

   irregular 
  mass 
  measuring 
  as 
  much 
  as 
  3 
  centimeters 
  in 
  diameter 
  and 
  

   containing 
  as 
  many 
  as 
  eight 
  confluent 
  subcolonies. 
  In 
  all 
  these 
  cases 
  

   the 
  base 
  is 
  an 
  edge 
  more 
  or 
  less 
  thin 
  which 
  does 
  not 
  permit 
  one 
  to 
  

  

  