﻿32 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL. 
  MUSEUM 
  vol.67 
  

  

  are 
  cylindrical, 
  polygonal, 
  crossed 
  by 
  numerous 
  diaphragms; 
  the 
  

   walls 
  are 
  thick, 
  vesicular, 
  peiforated, 
  and 
  united 
  with 
  the 
  visors. 
  

  

  Genotype. 
  — 
  Neuropora 
  conuligera 
  Hennig, 
  1893, 
  Cretaceous. 
  The 
  

   genus 
  was 
  at 
  first 
  referred 
  to 
  the 
  bryozoa; 
  then 
  it 
  was 
  classed 
  among 
  

   the 
  hydroids, 
  but 
  in 
  1893 
  Hennig's 
  study 
  of 
  the 
  genus 
  definitely 
  

   established 
  its 
  structure. 
  The 
  Lower 
  Cretaceous 
  species 
  are 
  simpler 
  

   and 
  less 
  well 
  characterized 
  than 
  those 
  of 
  the 
  Upper 
  Cretaceous. 
  

  

  The 
  veinules 
  are 
  formed 
  by 
  solidified 
  tubes. 
  We 
  are 
  ignorant 
  of 
  

   their 
  physiological 
  function. 
  

  

  NEUROPORA 
  RAMOSA, 
  new 
  species 
  

  

  Plate 
  25, 
  figs. 
  9-12 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  ramose, 
  borne 
  on 
  a 
  very 
  small 
  

   base, 
  with 
  the 
  branches 
  often 
  pyriform. 
  The 
  orifices 
  are 
  rather 
  large, 
  

   polygonal, 
  arranged 
  in 
  quincunx, 
  ornamented 
  with 
  tubercles 
  at 
  the 
  

   angles. 
  The 
  veinules 
  are 
  irregular 
  and 
  converge 
  toward 
  the 
  extrem- 
  

   ity 
  of 
  the 
  lobes. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  the 
  orifice, 
  0.12 
  mm. 
  

  

  Affinities. 
  — 
  The 
  form 
  of 
  some 
  zoaria 
  approaches 
  that 
  of 
  typical 
  

   Neuropora, 
  but 
  such 
  specimens 
  are 
  rare. 
  The 
  lobes 
  become 
  elongated 
  

   generally 
  into 
  veritable 
  branches, 
  although 
  pyriform 
  also. 
  In 
  longi- 
  

   tudinal 
  sections 
  the 
  tubular 
  walls 
  are 
  thick, 
  formed 
  by 
  a 
  compact 
  tis- 
  

   sue 
  which 
  corresponds 
  to 
  the 
  exterior 
  tubercles. 
  The 
  tubes, 
  solidified 
  

   and 
  meeting 
  at 
  the 
  point 
  of 
  convergence 
  of 
  the 
  veinules, 
  are 
  some- 
  

   what 
  wider 
  than 
  the 
  others. 
  The 
  sections 
  of 
  this 
  species 
  are 
  very 
  

   opaque 
  and 
  difficult 
  to 
  interpret. 
  

  

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

   Switzerland. 
  

  

  Cotype.— 
  Cat. 
  No. 
  69875, 
  U.S.N.M. 
  

  

  NEUROPORA 
  ARBUSCULA, 
  new 
  species 
  

  

  Plate 
  25, 
  figs. 
  1-3 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical, 
  arborescent, 
  with 
  

   short 
  branches. 
  The 
  orifices 
  are 
  polygonal, 
  arranged 
  in 
  quincunx, 
  

   ornamented 
  with 
  a 
  lateral 
  somewhat 
  salient 
  tuberosity. 
  The 
  vein- 
  

   ules 
  are 
  irregular 
  and 
  longitudinal. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.10 
  mm.; 
  width 
  of 
  zoarium, 
  

   6 
  mm. 
  

  

  Affinities. 
  — 
  In 
  the 
  exterior 
  aspect 
  this 
  species 
  is 
  very 
  close 
  to 
  

   Neuropora 
  pyriformis, 
  but 
  it 
  differs 
  in 
  its 
  cylindrical 
  zoarium, 
  its 
  

   much 
  broader 
  base, 
  and 
  its 
  somewhat 
  smaller 
  zooecial 
  diameter. 
  

  

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

   Switzerland. 
  

  

  Cotype.— 
  Cat. 
  No. 
  69876, 
  U.S.N.M. 
  

  

  