﻿CYCLOSTOMATOUS 
  BEYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  23 
  

  

  enlaiged 
  portion. 
  The 
  zonal 
  lines 
  are 
  formed 
  by 
  vesicles 
  which 
  are 
  

   larger 
  and 
  have 
  very 
  thick 
  walls; 
  they 
  become 
  transformed 
  some- 
  

   times 
  into 
  true 
  partial 
  basal 
  lamellae. 
  The 
  new 
  tubes 
  arise 
  from 
  a 
  

   rootlike 
  base 
  and 
  we 
  can 
  suppose 
  that 
  they 
  cover 
  tubes 
  in 
  which 
  

   the 
  polypide 
  is 
  aborted 
  or 
  diseased 
  and 
  is 
  not 
  able 
  to 
  continue 
  its 
  

   skeleton 
  with 
  enough 
  of 
  regularity. 
  

  

  Affinities. 
  — 
  This 
  species 
  differs 
  from 
  Ceriopora 
  angustipedis 
  in 
  its 
  

   more 
  elongated 
  zoarium, 
  in 
  the 
  smaller 
  diameter 
  of 
  its 
  orifice, 
  and 
  in 
  

   the 
  presence 
  of 
  false 
  lamellae 
  covering 
  the 
  zoarium. 
  

  

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

   Switzerland 
  (common) 
  . 
  

  

  Coty 
  pes. 
  —Cat. 
  No. 
  69863, 
  U.S.N.M. 
  

  

  -^pSBB^g^^^^s^ 
  

  

  Fig 
  7.— 
  Ceriopora 
  angustipedis, 
  new 
  species. 
  Meridian 
  section, 
  X 
  1(3, 
  entirely 
  across 
  a 
  zoarium. 
  Lower 
  

   Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  Switzerland 
  

  

  CERIOPORA 
  ANGUSTIPEDIS, 
  new 
  species 
  

  

  Plate 
  22, 
  figs. 
  15-17 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  globular, 
  with 
  a 
  narroio 
  base, 
  

   somewhat 
  broader 
  than 
  high, 
  entire 
  or 
  apparently 
  covered 
  by 
  lamel- 
  

   lae 
  wholly 
  enveloping 
  it. 
  The 
  tubes 
  have 
  thickened 
  walls; 
  the 
  aper- 
  

   tures 
  are 
  polygonal 
  and 
  arranged 
  in 
  quincunx. 
  Zonal 
  lines 
  are 
  

   rare. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.12 
  mm.; 
  maximum 
  zo- 
  

   arial 
  width, 
  9 
  mm.; 
  maximum 
  zoarial 
  height, 
  S 
  mm. 
  

  

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

   very 
  thick 
  walls; 
  these 
  walls 
  are 
  very 
  finely 
  vesicular 
  but 
  never 
  

   moniliform; 
  the 
  diaphragms 
  are 
  concave 
  and 
  very 
  irregularly 
  placed. 
  

   Our 
  sectioned 
  specimen 
  did 
  not 
  show 
  zonal 
  lines 
  very 
  clearly. 
  It 
  

   is 
  probable 
  that 
  the 
  specimen 
  shown, 
  which 
  exhibits 
  at 
  the 
  base 
  

   three 
  enveloping 
  lamellae, 
  would 
  in 
  sections 
  show 
  the 
  zonal 
  lines 
  

   transformed 
  into 
  basal 
  lamellae, 
  as 
  in 
  Ceriopora 
  ovoidea. 
  

  

  