﻿62 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  Structure. 
  — 
  The 
  zoarial 
  aspect 
  is 
  that 
  shown 
  in 
  D'Orbigny's 
  figure. 
  

   The 
  subcolonies 
  are 
  superposed 
  and 
  joined 
  to 
  each 
  other 
  by 
  tubes 
  of 
  

   greater 
  diameter. 
  In 
  each 
  of 
  them 
  the 
  tubes 
  are 
  arranged 
  in 
  quin- 
  

   cunx. 
  The 
  visor 
  is 
  salient 
  and 
  triangular. 
  The 
  visors 
  are 
  very 
  

   fragile; 
  they 
  disappear 
  at 
  the 
  least 
  weathering; 
  then 
  the 
  tubes 
  and 
  

   cancelli 
  are 
  indistinguishable 
  and 
  appear 
  as 
  polygonal 
  tubes 
  with 
  

   thickened 
  walls 
  of 
  an 
  aspect 
  very 
  similar 
  to 
  that 
  of 
  D'Orbigny's 
  

   figure 
  (14). 
  

  

  The 
  ovicells 
  are 
  visible 
  only 
  in 
  the 
  protected 
  parts 
  of 
  the 
  zoarium. 
  

   They 
  have 
  the 
  usual 
  aspect 
  of 
  the 
  ovicells 
  in 
  the 
  Lichenoporidae, 
  but 
  

  

  a 
  remarkable 
  phenomenon 
  is 
  that 
  the 
  

   tubes 
  between 
  which 
  they 
  are 
  arranged 
  

   are 
  grouped 
  in 
  radial 
  uni- 
  or 
  biserial 
  

   lines 
  and 
  that 
  on 
  the 
  zoarial 
  surfaces 
  

   the 
  tubes 
  are 
  arranged 
  in 
  quincunx 
  

   and 
  never 
  in 
  lines 
  or 
  in 
  fascicles 
  with 
  

   adjacent 
  tubes. 
  

  

  In 
  longitudinal 
  sections 
  the 
  tubes 
  

   are 
  cylindrical, 
  with 
  dorsal 
  gemma- 
  

   tion; 
  the 
  cancelli 
  are 
  ramifications 
  of 
  

   more 
  or 
  less 
  length 
  and 
  of 
  a 
  diameter 
  

   almost 
  equal 
  to 
  that 
  of 
  the 
  tubes. 
  

   The 
  interior 
  spines 
  of 
  the 
  cancelli, 
  

   although 
  visible 
  exteriorly, 
  are 
  very 
  

   fragile 
  and 
  disappear 
  in 
  sections. 
  

  

  The 
  subcolonies 
  are 
  little 
  distinct 
  

   in 
  small 
  zoaria. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  

   (Aptian) 
  : 
  Faringdon, 
  England. 
  

   Plesioty 
  pes. 
  —Cat. 
  No. 
  69910, 
  U.S.N.M. 
  

  

  Fig. 
  31.— 
  Multigalea 
  canui 
  Gregory, 
  1909, 
  

   Longitudinal 
  section, 
  X 
  16. 
  Lower 
  Cre 
  

   taceous 
  (Aptian): 
  Faringdon, 
  England 
  

  

  MULTIGALEA 
  MARGINATA, 
  new 
  species 
  

  

  Plate 
  19, 
  figs. 
  7-10 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  large, 
  cylindrical, 
  borne 
  upon 
  an 
  ex- 
  

   panded 
  base. 
  The 
  subcolonies 
  are 
  orbicular, 
  convex, 
  bordered 
  by 
  a 
  

   smooth 
  lamella 
  of 
  more 
  or 
  less 
  width. 
  The 
  tubes 
  are 
  polygonal, 
  

   arranged 
  in 
  irregular 
  quincunx, 
  provided 
  superiorly 
  with 
  a 
  short 
  and 
  

   fragile 
  visor. 
  The 
  cancelli 
  arc 
  little 
  distinct 
  from 
  the 
  tubes. 
  

  

  Affinities. 
  — 
  This 
  species 
  differs 
  from 
  Multigalea 
  canui 
  Gregory, 
  

   1909, 
  in 
  its 
  tubular 
  walls 
  little 
  thickened 
  and 
  in 
  the 
  presence 
  of 
  smooth 
  

   margins 
  around 
  the 
  subcolonies. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  Eolotype.— 
  Cat. 
  No. 
  69911, 
  U.S.N.M. 
  

  

  