﻿26 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  Structure. 
  — 
  The 
  zonal 
  lines 
  are 
  numerous, 
  very 
  close 
  together, 
  

   formed 
  in 
  large 
  part 
  by 
  diaphragms; 
  they 
  sometimes 
  are 
  trans- 
  

   formed 
  into 
  basal 
  lamellae. 
  The 
  walls 
  of 
  the 
  tubes 
  are 
  quite 
  thick 
  

  

  and 
  formed 
  of 
  a 
  large 
  number 
  of 
  

   small 
  orbicular 
  vesicles, 
  arranged 
  

   frequently 
  in 
  two 
  rows. 
  This 
  struc- 
  

   ture 
  is 
  more 
  visible 
  in 
  tangential 
  

   sections, 
  where 
  all 
  the 
  small 
  vesicles 
  

   are 
  quite 
  visible 
  between 
  the 
  polygonal 
  

   tubes. 
  

  

  Affinities. 
  — 
  In 
  its 
  zoarial 
  form 
  this 
  

   species 
  is 
  rather 
  close 
  to 
  Ceriopora 
  aequi- 
  

   pedis, 
  but 
  it 
  differs 
  in 
  its 
  much 
  smaller 
  

   aperture 
  (0.08 
  mm. 
  and 
  not 
  0.12 
  mm.) 
  

   and, 
  in 
  sections, 
  in 
  the 
  nonmoniliform 
  

   zooecial 
  walls. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Val- 
  

   fig. 
  io.- 
  ceriopora 
  panipora, 
  new 
  species, 
  angian) 
  : 
  Sainte-Croix 
  (Vaud), 
  Switzer- 
  

  

  Meridian 
  section, 
  X 
  16. 
  Lower 
  Creta- 
  land 
  (common) 
  . 
  

  

  ceous 
  (Valangian): 
  Sainte-Croix, 
  Switzer- 
  , 
  ,~ 
  , 
  T 
  ..... 
  ,, 
  „ 
  ,, 
  , 
  , 
  

  

  , 
  and 
  Cotypes. 
  — 
  Cat. 
  No. 
  69867, 
  I 
  .S.^.M. 
  

  

  CERIOPORA 
  NUMMULARIA, 
  new 
  species 
  

  

  Plate 
  23, 
  figs. 
  1-4 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  orbicular 
  or 
  elliptical, 
  lenticular. 
  

   convex, 
  apparently 
  covered 
  over 
  by 
  one 
  or 
  two 
  enveloping 
  lamellae; 
  

   the 
  base 
  is 
  somewhat 
  concave. 
  The 
  tubes 
  are 
  little 
  thickened; 
  the 
  

   apertures 
  are 
  polygonal, 
  somewhat 
  oblique, 
  surrounded 
  by 
  very 
  

   small 
  and 
  irregular 
  tuberosities. 
  

  

  Fig. 
  11.— 
  Ceriopora 
  nummularia, 
  new 
  species. 
  Longitudinal 
  section, 
  X 
  16, 
  exhibiting 
  the 
  moniliform 
  

   tubes 
  with 
  large 
  vesicles 
  and 
  the 
  zonal 
  lines. 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  

   Switzerland 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.14 
  mm.; 
  diameter 
  of 
  

   zoarium, 
  7 
  mm. 
  

  

  Structure. 
  — 
  In 
  meridian 
  section 
  the 
  tubes 
  are 
  cylindrical, 
  with 
  

   peripheral 
  gemmation; 
  the 
  walls 
  are 
  thin 
  and 
  moniliform. 
  The 
  

   zonal 
  lines 
  are 
  little 
  separated 
  and 
  formed 
  by 
  calcareous 
  thicken- 
  

   ings. 
  Diaphragms 
  are 
  rare. 
  

  

  