﻿28 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  CERIOPORA 
  FALLAX, 
  new 
  species 
  

  

  Plate 
  23, 
  figs. 
  8-10 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  subcylindrical, 
  elongated, 
  appar- 
  

   ently 
  formed 
  of 
  many 
  enveloping 
  lamellae. 
  The 
  tubes 
  are 
  thin; 
  the 
  

   apertures 
  are 
  polygonal, 
  irregular, 
  with 
  heteroporoid 
  aspect. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  large 
  apertures, 
  0.16 
  mm.; 
  diameter 
  

   of 
  small 
  apertures, 
  0.08-0.12 
  mm.; 
  diameter 
  of 
  zoarium, 
  5 
  mm. 
  

  

  Structure. 
  — 
  This 
  species 
  is 
  very 
  deceiving. 
  Certain 
  parts 
  of 
  the 
  

   surface 
  have 
  large 
  and 
  small 
  tubes, 
  as 
  in 
  Heteropora; 
  but 
  sections 
  

   do 
  not 
  show 
  mesopores 
  in 
  the 
  strict 
  sense, 
  for 
  here 
  some 
  shorter 
  tubes 
  

   or 
  others 
  with 
  a 
  smaller 
  diameter 
  may 
  be 
  seen. 
  The 
  lamellae, 
  

  

  visible 
  exteriorly, 
  are 
  

   not 
  complete 
  and 
  arise 
  

   by 
  the 
  development 
  of 
  

   partial 
  basal 
  lamellae. 
  

  

  The 
  zooecial 
  walls 
  are 
  

   vesicular 
  and 
  moniform; 
  

   the 
  vesicles 
  are 
  little 
  

   swollen 
  and 
  their 
  lateral 
  

   walls 
  only 
  are 
  very 
  thick. 
  

   Diaphragms 
  exist 
  only 
  at 
  

   the 
  center 
  of 
  the 
  colony. 
  

   Occurrence. 
  — 
  Lower 
  

  

  Fig. 
  13.— 
  Cerioporafallax, 
  new 
  species. 
  A 
  meridian 
  section, 
  X 
  16. 
  CretaceOUS 
  (Valangian) 
  I 
  

   The 
  zonal 
  lines 
  are 
  transformed 
  into 
  basal 
  lamellae. 
  Lower 
  Sainte-Croix 
  (Vaud) 
  

   Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  Switzerland 
  , 
  .. 
  

  

  Switzerland 
  (rare). 
  

   Coty 
  pes. 
  —Cat. 
  No. 
  69870, 
  U.S.N.M. 
  

  

  CERIOPORA 
  SPONGIOIDES, 
  new 
  species 
  

  

  Plate 
  24, 
  figs. 
  7-10 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  subglobular 
  or 
  massive, 
  with 
  a 
  

   very 
  narrow 
  base. 
  The 
  tubes 
  are 
  thick; 
  the 
  apertures 
  are 
  very 
  irrreg- 
  

   ular 
  and 
  give 
  to 
  the 
  surface 
  the 
  aspect 
  of 
  a 
  calcareous 
  sponge. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifices, 
  0.12 
  mm.; 
  length 
  of 
  zoarium, 
  

   12 
  mm.; 
  height 
  of 
  zoarium, 
  8 
  mm. 
  

  

  Affinities. 
  — 
  Our 
  sections 
  were 
  not 
  good 
  and 
  we 
  have 
  been 
  unable 
  

   to 
  study 
  the 
  structure 
  of 
  this 
  fossil. 
  The 
  species 
  differs 
  from 
  Cerio- 
  

   pora 
  angustipedes 
  in 
  the 
  aspect 
  of 
  the 
  surface 
  and 
  in 
  its 
  zoaria, 
  which 
  

   are 
  higher 
  than 
  broad. 
  It 
  differs 
  from 
  Ceriopora 
  ovoidea 
  only 
  in 
  the 
  

   general 
  aspect 
  of 
  the 
  surface, 
  which 
  is 
  of 
  a 
  nature 
  that 
  may 
  represent 
  

   only 
  alteration 
  in 
  fossilization. 
  We 
  figure 
  traces 
  of 
  ovicells 
  which 
  

   are 
  possibly 
  those 
  characteristic 
  of 
  Leiosoecia. 
  

  

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

   Switzerland 
  (common). 
  

  

  Cotype.—C&t. 
  No. 
  69871, 
  U.S.N.M. 
  

  

  